We use cookies to analyze user behavior in order to constantly improve the website for you. Learn more
(TSXV: ALTA) (FSE: T6UP) (OTC Pink: EQTRF)
("Altamira" or the "Company") is pleased to announce the results of an independently assessed
maiden mineral resource estimate for the Maria Bonita porphyry gold deposit within the Cajueiro Project
the Cajueiro Central Mineral Resource (previously reported under NI 43-101)
CEO Mike Bennett commented; "We are thrilled with the maiden mineral resource estimate for our Maria Bonita project
This is a transformational step forward for the company and
together with the existing resources at Cajueiro
doubles Altamira's Indicated and Inferred resource base
The mineralization at Maria Bonita is notably coherent and regular
with higher grades returned from near surface material
Coupled with our portfolio of nine drill-ready targets within the Cajueiro district
we now have an excellent opportunity to add to these resources through both the expansion of the defined mineral resources at both Maria Bonita and Cajueiro Central
and additional discoveries of porphyry-related mineralization in the district
We will be mobilising a drill rig shortly to continue testing of the extensions to the Maria Bonita mineralization and our district targets
We look forward to the continued delineation of the deposit and unlocking the potential of the other eight targets."
The Cajueiro project is located approximately 75km NW of the town of Alta Floresta in the state of Mato Grosso (Figure 1) in central western Brazil
lies on open farmland and has grid power and a local water supply (Figure1)
To view an enhanced version of this graphic, please visit:https://images.newsfilecorp.com/files/4500/250784_7bf8a4c5340228dd_001full.jpg
The Cajueiro Central project has current NI 43-101 resources* of 5.66Mt @ 1.02 g/t gold for a total of 185,000 oz in the Indicated Resource category and 12.66Mt @ 1.26 g/t gold for a total of 515,000 oz in the Inferred Resource category (estimated using a gold price of US$1,500/oz)
The maiden mineral resource estimate for Maria Bonita was completed by VMG Consultoria e Soluções Ltda of Belo Horizonte
Brazil under the direction of Volodymyr Myadzel PhD
The estimate is based on drilling undertaken by Altamira between August 2022 and April 2024
A total of thirty-one diamond drillholes (4,710m) have been completed at the Maria Bonita target
twenty-nine drill holes were used to estimate the mineral resource (4,518m)
The parameters used to constrain a pit shell in the mineral resource estimate process are presented in Table 1
The resource estimations are based on a block model interpolated by the Ordinary Kriging (OK) method
The block model was created using wireframes and filled with blocks measuring 25 (X) by 25 (Y) by 10 (Z) metres
The radii and the orientation of the search ellipses were determined using standard variograms
All Inferred Resources and Indicated Resources are defined in accordance with the Canadian Institute of Mining
Metallurgy and Petroleum Definition Standards for Mineral Resources and Mineral Reserves (2014) (the "CIM Standards")
a wireframe that encompasses the area with a 50×50 and 50×100 metre regular drilling grid was created
an average of 3 holes and 8 composite samples were used
The other blocks were classified as Inferred Resources
The block model was validated in several ways: by running an Inverse Distance Weighted interpolation and comparing the results
and by comparing the means and standard deviations of the block grades to the composite data set
an open pit mining configuration was used and
an agitated leach gold recovery was assumed
Industry standard assumptions on unit costs and other parameters were applied
Table 1: Maria Bonita independent Mineral Resource estimate parameters
To view an enhanced version of this graphic, please visit:https://images.newsfilecorp.com/files/4500/250784_altamiratable1.jpg
Open-pit Indicated Resources are 24.19Mt @ 0.46g/t (for a total of 357,800oz) and Total Inferred Resources are 25.64Mt @ 0.44g/t (for a total of 362,400oz)
These resources include near-surface saprolite Indicated resources of 2,02Mt @ 0.59g/t (for a total of 38,000oz) and Inferred Resources of 0.68t @ 0.40g/t (for a total of 8,700oz)
These resources were calculated using a 0.2 g/t gold cut-off grade and were estimated for the volume of mineralized material drill tested to date
Of particular importance in the resource estimate is the uniform style of mineralization and the regular grade distribution
To view an enhanced version of this graphic, please visit:https://images.newsfilecorp.com/files/4500/250784_altamiratable2.jpg
Table 2: Maria Bonita Mineral Resource at a 0.2g/t gold cut-off grade
A significant higher grade near-surface resource has also been identified
and at a 0.5 g/t gold cut-off comprises total Indicated Resources of 7.56Mt @ 0.72g/t (for a total of 176,250oz) and Total Inferred Resources are 5.18Mt @ 0.92g/t (for a total of 152,940oz) - Table 3
Table 3: Maria Bonita Mineral Resource sensitivity to gold cut-off grade
To view an enhanced version of this graphic, please visit:https://images.newsfilecorp.com/files/4500/250784_altamiratable3.jpg
The Maria Bonita porphyry gold deposit is part of a district-scale
There are currently eight additional porphyry gold targets over a strike of 12km east-west awaiting scout drill testing (Figure 2)
Figure 2: Maria Bonita maiden mineral resource
in relation to the Cajueiro Central mineral resource which comprises 185,000 ounces of gold in the Indicated category (5.66Mt @ 1.02 g/t) and an additional 515,000 ounces in the Inferred category (12.66Mt @ 1.26 g/t)
Untested district drill targets are depicted by yellow labels
To view an enhanced version of this graphic, please visit:https://images.newsfilecorp.com/files/4500/250784_7bf8a4c5340228dd_005full.jpg
a consultant to the Company as well as a Qualified Person as defined by National Instrument 43-101
supervised the preparation of the technical information in this news release
Further details supporting the geological model, estimation procedure and block modeling will be available in a National Instrument 43-101 Technical Report authored by Volodymyr Myadzel, PhD, MAIG, of VMG Consultoria e Soluções Ltda of Belo Horizonte, Minas Gerais, Brazil. The report will be posted under the Altamira profile at www.sedarplus.ca within 45 days from the date of this news release
The Company is focused on the exploration and development of gold and copper projects within western central Brazil
strategically advancing six projects spanning over 100,000 hectares within the prolific Juruena Gold Belt—an area that has historically yielded over 6 million ounces of placer gold**
Leading the portfolio is the Cajueiro project
a highly prospective asset with an NI 43-101 compliant resource estimate of 185,000 ounces of gold in the Indicated category (5.66Mt @ 1.02 g/t) and an additional 515,000 ounces in the Inferred category (12.66Mt @ 1.26 g/t)
Ongoing exploration and fieldwork at Cajueiro indicate the presence of multiple porphyry gold systems
reinforcing its potential for district-scale development
These hard-rock gold sources align with historical alluvial gold production
highlighting the region's exceptional gold endowment and scalability
With a rich geological setting and a track record of significant discoveries
the Company is well-positioned to unlock further value across its expansive land package
Tel: 604.676.5660Toll-Free:1-833-606-6271info@altamiragold.comwww.altamiragold.com
Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release
The securities described herein have not been registered under the U.S
Securities Act or any state securities laws
and may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements under the U.S
Securities Act and any applicable state securities laws
Certain information contained herein constitutes "forward-looking information" under Canadian securities legislation
statements with respect to the extension of the Warrants
forward-looking information can be identified by the use of forward-looking terminology such as "will"
"intends" or variations of such words and phrases or statements that certain actions
Forward-Looking statements are based on the opinions and estimates of management as of the date such statements are made and they are subject to known and unknown risks
uncertainties and other factors that may cause the actual results to be materially different from those expressed or implied by such forward-looking statements or forward-looking information
including the receipt of all necessary regulatory approvals
Although management of the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking statements or forward-looking information
there may be other factors that cause results not to be as anticipated
There can be no assurance that such statements will prove to be accurate
as actual results and future events could differ materially from those anticipated in such statements
readers should not place undue reliance on forward-looking statements and forward-looking information
The Company will not update any forward-looking statements or forward-looking information that is incorporated by reference herein
except as required by applicable securities laws
Gold analysis has been conducted by SGS method FAA505 (fire assay of 50g charge)
with higher grade samples checked by FAA525
Analytical quality is monitored by certified references and blanks
samples are stored under the supervision the Company's exploration office
The samples are couriered to the assay laboratory using a commercial contractor
Pulps are returned to the Company and archived
Drill holes results are quoted as down-hole length weighted intersections
To view the source version of this press release, please visit https://www.newsfilecorp.com/release/250784
SOURCE: Altamira Gold Corp.
Sign Up
Company Profile
Mining and Metals
Precious Metals
(OTC: EQTRF) has released its maiden mineral resource estimate for the Maria Bonita porphyry gold deposit
consists of indicated resources of 24.19 million tonnes grading 0.46 g/t gold
and inferred resources of 25.64 million tonnes grading 0.44 g/t gold
a higher-grade near-surface resource has been identified at a cut-off of 0.5 g/t gold
This includes indicated resources of 7.56 million tonnes grading 0.72 g/t gold (176,250 ounces) and inferred resources of 5.18 million tonnes grading 0.92 g/t gold (152,940 ounces)
This newfound potential highlights the attractiveness of the project
The Maria Bonita deposit remains open for expansion to the west
and the deposit exhibits a favorable strip ratio of 0.5:1
Altamira Gold has identified eight more prospective porphyry gold targets within the Cajueiro district
Located approximately 75 km northwest of Alta Floresta in Mato Grosso
the Cajueiro project benefits from excellent infrastructure
facilitating ongoing exploration and expansion activities
+ by their nature, grab samples are not representative of the bulk metal content of a mineralized zone.
The Cajueiro project is located approximately 75km NW of the town of Alta Floresta in the state of Mato Grosso (Figure 1) in central western Brazil. The project is easily accessible by road, lies on open farmland and has grid power and a local water supply. Cajueiro is the most advanced of three key projects that Altamira controls in the region, the other two being Apiacas and Santa Helena (Figure1).
Figure 1: Location of the Cajueiro, Apiacas and Santa Helena projects.
To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/4500/248383_736f4da474588b09_001full.jpg
The Cajueiro Central project has current NI 43-101 resources* of 5.66Mt @ 1.02 g/t gold for a total of 185,000 oz in the Indicated Resource category and 12.66Mt @ 1.26 g/t gold for a total of 515,000 oz in the Inferred Resource category (estimated using a gold price of US$1,500/oz).
Reconnaissance drilling at the Maria Bonita target, located 7km west of the Cajueiro Central Mineral Resource, identified the first porphyry-hosted gold discovery at Cajueiro and returned gold values up to 146m @ 1g/t gold (from 23 metres depth) (see press release dated May 22, 2024).
A program of mapping, soil sampling and proprietary drone magnetics continues to develop new targets in the Cajueiro district (Figure 2). An east-west corridor of intrusive-related prospects, lies between major structures that were later reactivated and intruded by regional-scale gabbro dykes that extend over tens of kilometres.
Within this corridor, there are five prospects from Novo Sonho in the west to Guillermo in the east, over a distance of 12 km (Figure 2). To the south of this corridor, lies the Cajueiro Mineral Resource and two active prospects at Espirro and Serafim.
*NI 43-101 Technical Report, Cajueiro Project, Mineral Resource Estimate: Global Resource Engineering, Denver Colorado USA, 10th October 2019; Authors K. Gunesch, PE; H. Samari, QP-MMSA; T. Harvey, QP-MMSA
Figure 2: Cajueiro district targets (yellow labels) and their position in relation to the defined Mineral Resource at Cajueiro Central (white labels for sub-sectors). An alignment of six of the targets occur in close spatial association to a pronounced east-west fault corridor marked by later gabbroic dykes.
https://images.newsfilecorp.com/files/4500/248383_736f4da474588b09_002full.jpg
At Mombaque, two trenches have been excavated and sampled, totalling 380m. The underlying rocks are sericite altered tuffs, interpreted as overlying a mineralizing felsic intrusive at shallow depth. Results are pending.
Table 1: Tavares Norte trench results, based on 1 metre sample intervals.
At Morro Verde, located 1000m north of the central resource area, 8 additional grab rock chip samples+ returned an average of 0.28 g/t gold, with a peak value of 0.71g/t gold and all samples returning greater than 0.1 g/t gold. A single drill hole completed in 2017, (see press release dated August 1, 2017) intersected 65m of intrusive breccia containing dominantly volcanic wall-rock clasts.
Figure 3: Drillhole CJO-98, Morro Verde intrusive breccia.
https://images.newsfilecorp.com/files/4500/248383_736f4da474588b09_004full.jpg
Trenching at Guillermo has defined two zones of interest for drill testing. The rocks exposed in the trenches are felsic volcanics intruded by small stocks or dykes of altered and veined felsic igneous rocks (see press release dated December 11, 2024).
Results received to date include 35m @ 0.45 g/t gold, 7m @ 0.22 g/t gold and 7.6m @ 0.41 g/t gold (see Table 2). These results demonstrate that the intrusive rocks carry anomalous gold and warrant drill testing to confirm the subsurface continuity and grade trend of the trench intervals.
Table 2: Guillermo trench results, based on 1 metre sample intervals.
Soil sample and drone magnetic results are pending over parts of the grid. In a similar manner to the Maria Bonita area, mineralized porphyry intrusives are cut by later, barren phases of the inferred same felsic intrusive suite. Dating studies are ongoing to better interpret the age relationships.
Grab sampling+ of float breccia boulders at the Serafim prospect returned one sample containing 5.57 g/t gold. This sample is a breccia containing clasts of quartz veined porphyry intrusive which are interpreted to have been derived from the roof zone of a porphyry intrusive (Figure 4).
+ By their nature, grab samples are not representative of the bulk metal content of a mineralized zone.
Figure 4: Clasts from surface rock chip sample in Serafim hydrothermal breccia
https://images.newsfilecorp.com/files/4500/248383_736f4da474588b09_006full.jpg
Figure 5: Silicified hydrothermal breccia from Serafim containing 0.2g/t gold
https://images.newsfilecorp.com/files/4500/248383_736f4da474588b09_007full.jpg
These new results underline the emerging context of a set of porphyry-related gold occurrences within a defined structural corridor that shows evidence of at least four episodes of multiphase intrusive activity, pointing to a deep and reactivated set of structurally controlled magma conduits.
These favourable structural settings, with positive gold in soil and rock sampling, now provide a set of targets for scout drilling to extend the inventory of mineralization outside the Cajueiro Central Mineral Resource and the Maria Bonita discovery.
Guillermo Hughes, FAIG and M AusIMM., a consultant to the Company as well as a Qualified Person as defined by National Instrument 43-101, supervised the preparation of the technical information in this news release.
Ongoing exploration and fieldwork at Cajueiro indicate the presence of multiple porphyry gold systems, reinforcing its potential for district-scale development. These hard-rock gold sources align with historical alluvial gold production, highlighting the region's exceptional gold endowment and scalability. With a rich geological setting and a track record of significant discoveries, the Company is well-positioned to unlock further value across its expansive land package.
** Juliani, C. et al ; Gold in Paleoproterozoic (2.1 to 1.77 Ga) Continental Magmatic Arcs at the Tapajós and Juruena Mineral Provinces (Amazonian Craton,Brazil): A New Frontier for the Exploration of Epithermal-Porphyry and Related Deposits. Minerals 2021, 11, 714. https://doi.org/10.3390/min11070714
Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.
The securities described herein have not been registered under the U.S. Securities Act or any state securities laws, and may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements under the U.S. Securities Act and any applicable state securities laws.
Gold analysis has been conducted by SGS method FAA505 (fire assay of 50g charge), with higher grade samples checked by FAA525. Analytical quality is monitored by certified references and blanks. Until dispatch, samples are stored under the supervision the Company's exploration office. The samples are couriered to the assay laboratory using a commercial contractor. Pulps are returned to the Company and archived. Drill holes results are quoted as down-hole length weighted intersections.
* NI 43-101 Technical Report, Cajueiro Project, Mineral Resource Estimate: Global Resource Engineering, Denver Colorado USA, October 10, 2019; Authors K. Gunesch, PE; H. Samari, QP-MMSA; T. Harvey, QP-MMSA
To view the source version of this press release, please visit https://www.newsfilecorp.com/release/248383
Altamira Gold Corp. (EQTRF) has reported significant new discoveries of porphyry-related gold mineralization near its Cajueiro Central Mineral Resource in Brazil. The company highlighted promising results from two newly defined target areas, enhancing the district's potential.
At the Serafim target, located 2km east of the current resource, rock chip sampling revealed a hydrothermal breccia with clasts of veined porphyry intrusive, yielding a grab sample of 5.6 g/t gold. Meanwhile, the Tavares Norte prospect demonstrated an average of 3.2 g/t gold from rock samples, with the highest reaching 7.8 g/t gold. A trench in this area outlined significant mineralized intervals, with a 31m stretch averaging over 0.25 g/t gold.
The Cajueiro project, positioned 75km northwest of Alta Floresta in Brazil, currently boasts a substantial NI 43-101 resource estimate of 185,000 oz in the Indicated category (5.66Mt @ 1.02 g/t gold) and 515,000 oz in the Inferred category (12.66Mt @ 1.26 g/t gold). The project area includes eight new drill target zones, extending over a 14km east-west corridor.
Further exploration continues to identify new drilling targets in the Cajueiro district, which is supported by robust infrastructure including road access, grid power, and water supply. Altamira Gold aims to expand its understanding of the region's geology and confirm the continuity of mineralization through additional drilling initiatives.
Highlights: Results of the final two second-round diamond drillholes at the Maria Bonita discovery located within the Cajueiro project area were received and returned 32.7 metres of 0.53 g/t gold in MBA030 and 46.5 metres of 0.50 g/t gold in MBA031
Work continues on the analysis and interpretation of drill results
Recent surface sampling at the Casa Branca target area of the Apiacas project
returned highly anomalous gold in all surface samples collected
Ten grab samples all contain gold greater than 0.5 g/t
and average 14.5 g/t gold with two high grade values of 69 g/t and 52 g/t gold
“The results of the last two drillholes at the Maria Bonita discovery confirm that the porphyry gold deposit carries consistent gold mineralization from surface
We are working through the interpretation of the three-dimensional geological model to define potential zones of extension and repetition of the mineralization for further drill testing
The mineralized system remains open in several directions and at depth
Our new Casa Branca target at the Apiacas project is again intrusive hosted with disseminated gold mineralization observed on surface
Further mapping and sampling are planned in advance of reconnaissance drilling.”
The Cajueiro project is located approximately 75km NW of the town of Alta Floresta in the state of Mato Grosso
central western Brazil and is easily accessible by road and has grid power and local water supply
Cajueiro is the most advanced of three key projects that Altamira controls in the region
the other two being Apiacas and Santa Helena
The Cajueiro project has NI 43-101 resources of 5.66Mt of 1.02 g/t gold for a total of 185,000 oz Indicated and 12.66Mt of 1.26 g/t gold for a total of 515,000 oz Inferred (estimated using a gold price of US$1,500/oz)
Included in these totals are near-surface oxide portions of the Cajueiro resource
Maria Bonita is located 7km west of the Cajueiro mineral resource and is easily accessible by road
The current drill program is a follow-up to the initial round of discovery drillholes which include 69 metres of 1 g/t gold (MBA005)
50m of 1.0 g/t gold (MBA001) and 45m of 1.4 g/t gold (MBA003)
Significant results previously reported as part of the current follow-up drill program include: MBA029: 213m of 0.8 g/t gold from surface including 146m of 1.0g/t from 23m
MBA016: 90m of 0.6g/t gold from 14m and 65m @ 0.4g/t gold from 118m
MBA018: 105m of 0.5g/t gold from 23m and 24m @ 0.4g/t gold from 144m
Mapping and logging of drill core from the Maria Bonita second drill program is ongoing to identify the various phases of porphyry intrusion
The results of the final two drillholes from the second drill program include 32.7m of 0.53 g/t gold in MBA030 and 46.5m of 0.50 g/t gold in MBA031
These two short vertical HQ holes were completed primarily to provide new metallurgical samples across the grade range for further heap leach testing and optimization
The holes were completed within the central zone of the drilling area
Sample selection and testing will proceed shortly
The Apiacas project is located approximately 120km north-west of Alta Floresta and 60km west of the Cajueiro mineral resource
Approximately 1 million ounces of gold is inferred to have been recovered historically (since 1980) from alluvial and eluvial sources in the district
Primary gold mineralization is poorly exposed
particularly in the large areas of former alluvial workings
The Casa Branca target is located 10km east of the Mutum target at Apiacas and
it exhibits strong sericite-pyrite alteration with disseminated gold mineralization in intrusive rocks
This is a newly defined prospect outside the main area of historic alluvial/eluvial production at Apiacas
A proprietary drone aeromagnetic survey has been completed and the data processed via consultant geophysicist Core Geophysics of Perth
The results indicate an association between the prospect location and a magnetic low lying to the north of a magnetite bearing intrusive whose contact is mappable on the ground
Ten samples were collected from the alteration zone exposed on surface and all returned gold values above 0.5 g/t
The samples average 14.5 g/t gold with two high grade values of 69 g/t and 52 g/t gold
Further mapping and sampling is in progress and could lead to the definition of targets for reconnaissance drilling
The company is focused on the exploration and development of gold and copper projects within western central Brazil
The Company holds six projects comprising approximately 190,000 hectares
within the prolific Juruena gold belt which historically produced an estimated 7 to 10Moz of placer gold
is company that offers investors an opportunity to participate..
By Peter Kennedy Namib Minerals is set to become a publicly traded company in the U.S.,..
is a company that offers investors an opportunity into early-stage..
is entering a new growth phase as it moves to..
By Peter Kennedy Lack of available infrastructure has long been a perceived impediment to the development..
By Peter Kennedy The Golden Triangle mining district in northwestern British Columbia ranks among the richest..
Metrics details
We model and forecast the early evolution of the COVID-19 pandemic in Brazil using Brazilian recent data from February 25
This early period accounts for unawareness of the epidemiological characteristics of the disease in a new territory
sub-notification of the real numbers of infected people and the timely introduction of social distancing policies to flatten the spread of the disease
We use two variations of the SIR model and we include a parameter that comprises the effects of social distancing measures
Short and long term forecasts show that the social distancing policy imposed by the government is able to flatten the pattern of infection of the COVID-19
our results also show that if this policy does not last enough time
it is only able to shift the peak of infection into the future keeping the value of the peak in almost the same value
our long term simulations forecast the optimal date to end the policy
we show that the proportion of asymptomatic individuals affects the amplitude of the peak of symptomatic infected
suggesting that it is important to test the population
We use the Brazilian recent data from February 25
2020 to model and forecast the evolution of the COVID-19 pandemic
Our study focuses on the early period of the pandemics that accounts for unawareness of the epidemiological characteristics of the disease in a new territory
This work has had the practical appeal for providing preliminary estimates of Covid-19 epidemiological parameters and the duration of the social distancing policy in Brazil
The SIR model describes the spread of a disease in a population split into three non-intersecting classes: susceptible (S) are individuals who are healthy but can contract the disease; Infected (I) are individuals who are sick; Recovered (I) are individuals who recovered from the disease
the size of each of these classes change over time and the total population size N is the sum of these classes
Let \(\beta \) be the average number of contacts that are sufficient for transmission of a person per unit of time t
Then \(\beta I/N\) is the average number of contacts that are sufficient for transmission with infective individuals per unit of time of one susceptible and \((\beta I/N)S\) is the number of new cases per unit of time due to the S susceptible individuals
which is the rate that infected individuals recover or die
at constant per capita probability per unit of time
It is worth mentioning that we can also evaluate the number of recovered individuals from Eq. (1) using also the number of susceptible and infected individuals, since in this version of the SIR model (Eq. 2) the population is constant
since we are modeling a short term pandemic
we do not consider the demographic effects and we assume that an individual does not contract the disease twice
we only included it for the sake of reference
where \(\frac{\rho }{1-\rho } \gamma I\) is the number of people in the population that die due to the disease per unity of time and D is the number of people that die due to the disease
Note that in this case the number of individuals in the population reduces due to the infection according to \(\frac{dN}{dt} = -\frac{\rho }{1 - \rho } \gamma I\)
we call this model “SIRD” (Susceptible-Infected-Recovered-Dead) model
where \(I_A\) is the number of asymptomatic individuals
\(I_S\) is the number of symptomatic individuals
\(R_A\) and \(R_S\) are the recovered individuals from the asymptomatic and symptomatic infection
and p is the proportion of individuals who develop symptoms
we call this model “SIRASD” (Susceptible-Infected-Recovered for Asymptomatic-Symptomatic and Dead) model
the condition that N is constant does not hold anymore and if we need to evaluate N over time
we need to integrate \(\frac{dN}{dt} = -\frac{\rho }{1 - \rho } \gamma _S I_S\)
Note that doing this procedure we avoid the introduction and estimations of new “\(\beta \)s” and we may use \(\psi \) to evaluate the effectiveness of social distancing policy
we may measure the social distance as \(1-\psi \)
Our models provide estimates of the epidemiological parameters
that are consistent with the international literature
and good forecasts of the short-term Brazilian time series of infected individuals in Brazil
one of our models assesses the number of asymptomatic (or individuals with mild symptoms that do not look for the hospitals and are not being tested)
We use these models to simulate long-term scenarios of the pandemics that depend on the level of engagement of the Brazilian social distancing policy
We show that: (1) the social distancing policy imposed by the government is able to flatten the pattern of contamination provided by the COVID-19; (2) there is an optimal date for abandoning the social distancing policy; (3) short-term social distancing policies only shift the peak of infection into the future keeping the value of the peak in almost the same value
(4) The proportion of asymptomatic individuals affects the amplitude of the peak of symptomatic infected
meaning that it is important to invest in testing the population
Estimations of the SIRD model for different final date points
The solid line corresponds to the last date which the model was estimated
in which we estimate the paramter \(\psi \)
We start by estimating the parameters of the SIRD model
\(\gamma \) and \(\rho \) by minimizing the squared error
where \(I_t^{cum}\) and \(D_t\) are the cumulative number of infected individuals and deaths
which are the real data provided by the Ministry of Health of Brazil
\(\hat{R}_t\) and \(\hat{D}_t\) are estimated values of the infected
We use the nonlinear function \(f(z) = C^2 \log \left( (g(z)/C)^2 \right) \) to correct the exponential characteristic of the series so that the errors of the last values of the series do not dominate the minimization
we use the scaling parameter \(C=2\) to soft threshold between inliers and outliers
we note that the estimated epidemiological parameters vary less among simulations with different random seeds
Note that we lack information on the number of asymptomatic individuals
since the clear recommendation of the Ministry of Health is to test for the virus only if one has moderate or severe symptoms
which recommends individuals with mild symptoms to stay at home and do not seek for medical attention
the mortality rate is evaluated mostly over the symptomatic ones
since the asymptomatic are in many cases not tested
\(\gamma _S=\gamma \) and we keep the value of \(\rho \)
and assuming that there is only one asymptomatic individual in the beginning of the simulation
\(\gamma _A\) and p in order to minimize the squared error
where \(I_t^{cum}\) and \(D_t\) are real data provided by the Ministry of Health of Brazil
the cumulative number of infected individuals and deaths
\(\hat{R}_{S,t}\) and \(\hat{D}_t\) are estimated values of the symptomatic infected and recovered individuals
Short term forecast of the SIRD model taking into account government social distance measures. The solid line corresponds to the last date which the model was estimated, and the dashed line are model predictions. We show the evolution of the cumulative number of infected with 95% confidence interval. We represent the real data as points.
Short term forecast of the SIRASD model taking into account government social distance measures
We show the evolution of the infected (assymptomatic
symptomatic and both) with 95% confidence interval
Long term forecasts of number of infected for different scenarios using the SIRD model. Black, blue, yellow and red lines represent scenarios I–IV, respectively.
Long term forecasts of number of infected for different scenarios using the SIRASD model
yellow and red lines represent scenarios I–IV
While solid lines represent the symptomatic infected individuals
dashed lines represent total infected individuals
we may note that while the SIRASD model predicts that the number of infected is higher than the estimates of the SIRD model
it also predicts a lower peak for the infected with symptoms
which are the ones that could require medical attention
the last day of the social distancing policy is June 22
Proportions of asymptomatic and symptomatic over time using \(I_{A,0} = 1\). We show the instant proportion of infected (left) and the cumulative number of infected (right). Approximately 70% are asymptomatic in March 30, 2020, which corresponds to 68% cumulatively or \((1-p)\).
The effect of symptomatic percentage (parameter p) in the proportion of symptomatic in the peak
evaluate the symptomatic proportion (parameter p in the SIRASD model)
then calculate the peak value of symptomatic infected
So if we assume that the number of asymptomatic (symptomatic) individuals in data is larger (smaller) today
the number of asymptomatic (symptomatic) individuals will also be larger (smaller) in the time of the peak
leading to a smaller peak for the symptomatic
2020 to model and forecast the evolution of the COVID-19 pandemic in Brazil
We estimate two variations of the SIR model using historical data and we find parameters that are in accordance with the international literature
We also introduce a factor \(\psi \) to account for the effect of the government social distancing measures
Our methodology is able to estimate the asymptomatic individuals
Since the Brazilian government does not have enough tests for mass testing
this measure may provide some additional information
we show the relevance of the number of asymptomatic individuals
since the larger the number of asymptomatic individuals
the smaller the number hospital beds needed
The “stay at home” and “only test if you have strong symptoms” policies present contradictory effects in the disease control
While they avoid an increase in the number of infected people and the use of extra resources with people that present only mild symptoms
they reduce the amount of information about the real number of infected individuals
it explains the low value of the parameter that measures the proportion of individuals who present symptoms
since we count many individuals with mild symptoms as asymptomatic
While our short-term forecasts are in great accordance with the data
our long-term forecasts may help us to discuss different types of social distancing policies
We also show that the social distancing policy imposed by the government is able to flatten the pattern of contamination provided by the COVID-19
but short-term policies are only able to shift the peak of infection into the future keeping the value of the peak in almost the same value
we define the idea of the optimal social distancing policy as the finite social distancing policy that the second peak that happens after stopping the policy is not larger than the first
we provide an estimate of the optimal date to end the social distancing policy
An important discussion is about the effectiveness of vertical containment policies
where only people at risk follow social distance policies
the dynamics of the population at risk behaves similarly to the case with social distancing measures
the dynamics of the population that is not at risk behaves similarly to the case without social distance measures but with a low death rate
since the fraction of the population that is at risk is much smaller than the rest of the population
the number of infected of the total population behaves similarly to the case without control
the policy’s effectiveness is not in reducing the number of infected
but in reducing the number of deaths by confining individuals at risk
It is worth mentioning that the effectiveness of these vertical containment polices depends strongly on the ability to separate the individuals at high risk from the individuals at low risk and on the number of vacancies in hospitals to treat the disease
We may extend our model to explore these type of scenarios and we leave for future work
While this method controls the error assuming accuracy of the fourth-order
it uses a fifth-order accurate formula to take the steps
We use the implementation “solve_ivp” of the scipy Python’s library
since we want to learn about the effect of \(I_{A0}\) in the proportion of symptomatic and asymptomatic individuals in the peak date
since the asymptomatic individuals do not have symptoms that may help the spread of the infection
Finally it is worth mentioning that this estimation procedure is sensitive to the random seed used by the algorithm as an initial condition. In particular, depending on this seed, we have found different epidemiological parameters in different simulations of the SIRD model, as presented in Table 5
We have chosen the simulation results that provided the closest value of the median of the parameter \(\gamma \)
which is the one that used the random seed 7
We emphasize that although any of the presented epidemiological parameters could be a possible estimation and we could use them in the main part of this paper
this choice does change the qualitative analysis and the conclusions of our paper
The datasets and codes used to generate all the results of the current study are available in the Zenodo repository, https://zenodo.org/record/4041467#.X2joy4Zv88o
World Heath Organization. Coronavirus overview. https://www.who.int/health-topics/coronavirus (2020)
The simulations driving the world’s response to covid-19
How epidemiologists rushed to model the coronavirus pandemic?
Mathematical models of infectious disease transmission
Modeling infectious diseases in humans and animals (2011)
Mathematical models in epidemiology (2019)
A contribution to the mathematical theory of epidemics
A model for the emergence of drug resistance in the presence of asymptomatic infections
How will country-based mitigation measures influence the course of the covid-19 epidemic?
Containing pandemic influenza with antiviral agents
Early dynamics of transmission and control of covid-19: A mathematical modelling study
An Seir Infectious Disease Model with Testing and Conditional Quarantine (Tech
et al.The Global Impact of Covid-19 and Strategies for Mitigation and Suppression (Tech
Real-time influenza forecasts during the 2012–2013 season
A simple mathematical model for ebola in Africa
Forecasting seasonal influenza with a state-space sir model
An empirical analysis of the ebola outbreak in west Africa
Brazilian Ministry of Health. Coronavirus panel. https://covid.saude.gov.br/ (2020)
Estimating clinical severity of covid-19 from the transmission dynamics in Wuhan
Nowcasting and forecasting the potential domestic and international spread of the 2019-ncov outbreak originating in Wuhan
Estimation of the reproductive number of novel coronavirus (covid-19) and the probable outbreak size on the diamond princess cruise ship: A data-driven analysis
Estimating the asymptomatic proportion of coronavirus disease 2019 (covid-19) cases on board the diamond princess cruise ship
Estimation of the asymptomatic ratio of novel coronavirus infections
The rate of underascertainment of novel coronavirus (2019-ncov) infection: Estimation using Japanese passengers data on evacuation flights
Eichenbaum, M. S., Rebelo, S. & Trabandt, M. The macroeconomics of epidemics. Working Paper 26882, National Bureau of Economic Research (2020). https://doi.org/10.3386/w26882.
Coronavirus: Impact on stock prices and growth expectations
Working Paper of the University of Chicago 1–27 (2020)
Fundamental algorithms for scientific computing in Python
Robust nonlinear regression in scipy (Tech
IWVA 1999: Vision Algorithms: Theory and Practice
Bundle Adjustment—A Modern Synthesis (Springer
Download references
Cajueiro is indebted to CNPQ for partial financial support under grant 302629/2019-0
Since this is an ongoing pandemic we received very useful comments from many people in Brazil directly involved with the study and the pandemics management
We would like to thank the comments of R.F.S
Andrade who is at Center for Data and Knowledge Integration for Health (CIDACS - Fio Cruz)
Cardoso who is at the Department of Physics of University of São Paulo (USP)
Freitas who belongs to the technical staff of the Brazilian Senate
Normey-Rico who are at the Department of Automation and Systems of the Universidade Federal de Santa Catarina (UFSC)
Riella who is at Brazilian School of Public and Business Administration of Getúlio Vargas Fundation (EBAPE-FGV)
Velho who is at the National Institute of Space Research (INPE)
several colleagues of the Department of Economics of University of Brasília (unB) and several colleagues of the Machine Learning Laboratory for Finance and Organizations (LAMFO-UnB) on an earlier version of the manuscript
Nacional Institute of Science and Technology for Complex Systems (INCT-SC)
Machine Learning Laboratory for Finance and Organizations (LAMFO)
performed the research and wrote the manuscript
The authors declare no competing interests
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations
Download citation
DOI: https://doi.org/10.1038/s41598-020-76257-1
Anyone you share the following link with will be able to read this content:
a shareable link is not currently available for this article
Sign up for the Nature Briefing: AI and Robotics newsletter — what matters in AI and robotics research
Please read our republishing guidelines to get started
A stone indicating the construction site of the São Luis port (image: Ingrid Barros)
Demonstrators warned police that there was a pregnant woman among them
trying to protect their homes against repossession by a private company
But the police pushed through to let the machines pass and soon used pepper spray
The pregnant woman staggered away from the diggers
Residents of the Cajueiro community in the Brazilian Amazon were continuing a struggle they have waged since 2014
They are trying to save their houses from a government-authorised plan that will dispossess them – a megaport linking São Luís
The São Luís Port project, headed by China Communications Construction Company (CCCC) and the Brazilian company WPR-São Luís Gestão de Portos e Terminais
and part-financed by a US$2.6 billion loan from the Industrial and Commercial Bank of China (ICBC)
aims to facilitate the export of Brazilian iron ore and soy
but this would be the first to be operated by a company from China
Destruction of a house in the Cajueiro community on August 12 to make way for the São Luis port project (image: Ingrid Barros)
22 tracts of land were repossessed and even more houses destroyed
34 of the original 250 inhabitants live there
Only seven lots have not yet been repossessed
Last month, more than 100 Brazilian and international signatories concerned about authorities’ treatment of the community sent a letter in support of Cajueiro residents to Leilani Farha
The conflict between the police and the community demonstrated the government’s brutal commitment to ensuring that the project go ahead
even as the state and federal prosecution services questioned its legality
How can the state grant a public deed to the community and then
someone appears claiming to be the owner of the area
São Luís Port is part of the “Northern Arc” initiative
a recipient of a flurry of public and private investments in ports
and highways designed to expedite the transit of mining and agricultural products from the Amazon and Cerrado regions
The project reveals conflicting visions for the Amazon – those who see it as a new frontier for industrial and agricultural development
The Amazon has already lost 18% of its forest cover
while half of the Cerrado savannah’s original vegetation is gone
Preserved areas are often home to indigenous people
quilombola communities of slave descendants
and small rural producers like those defending Cajueiro
“There used to be community members who had lived there together for decades
who had a good life and helped preserve the forest”
Construction of the port has already deforested an area equivalent to 200 football pitches
it must displace more families from Cajueiro
a community dating back to the mid-nineteenth century
Houses at the site have been demolished since 2014, some with, others without legal authorisation, as revealed in the investigation Besieged by Progress
Some residents have been threatened to leave by hired gunmen
Criminal activity could underpin much of the venture
as many land purchases and sales are dubious
Investigations by the Maranhão public prosecutor’s office indicate that a criminal operation has been forging titles for public land in order to enable to work on infrastructure projects in the area surrounding São Luís
prosecutors seized enough computers and documents to fill four pickup trucks
a fisher who lives in one of the communities in Cajueiro fixes a net for fishing crab
which are increasingly scarce in the region (image: Ingrid Barros)
The land title scheme appears to be led by a group comprised of companies
who specialises in agrarian conflicts at the Maranhão state prosecutor’s office
“How can the state grant a public deed to the community and then
someone appears claiming to be the owner of the area?” he asked
private individuals have usurped public land and sold it to companies linked to the port construction project
This can lead to the annulment of the private land deed and project licensing.”
a lawyer for the Jesus do Cajueiro Residents Union
land repossession for the port was illegal since it was not determined who owns the land
Nor were residents given any warning that they would be removed
Dias said they began to be removed on Monday 12
but the court order authorising repossession only arrived the following day
residents soon found themselves and their belongings in the street and with their houses demolished
the parties involved in proceedings should be summoned and informed prior to actions such as these,” Dias said
“The repossession was not in line with this process
and treated the residents like squatters.”
Days later, as they demonstrated against authorities’ brutality, protesters, residents and former residents of Cajueiro were forcibly pushed back from the Palácio dos Leões
by police using rubber bullets and tear gas
The Ordem dos Advogados do Brasil in Maranhão is investigating the case
Asked whether the repossession was authorised by the state judiciary, governor Flávio Dino, a member of Brazil’s Communist Party, tweeted: “the military police cannot simply refuse to carry out a court order
There have been several attempts at mediation
It is not up to the governor to revoke or suspend a decision by another branch of government”
WPR-São Luís Gestão de Portos e Terminais is offering those removed from the Cajueiro community “a new house, employment, temporary emergency financial assistance, and food assistance”, according to a pamphlet distributed by the company
or state how long benefits will be offered
the government of Maranhão says it is investigating allegations of violence against Cajueiro residents and protestors
but didn’t explain why repossessions took place without warning
China Communications Construction Company hadn’t responded to requests for an interview
Nor was it possible to make contact with WPR-São Luís Gestão de Portos e Terminais
Former president Michel Temer secured ICBC finance for the São Luís Port in September 2017
Such investments are part of the Chinese government’s policy encouraging domestic companies to expand their business overseas
director of the University of Pittsburgh’s University Center for International Studies
“Although the intent of this policy has been largely economic
Chinese leaders understand that this global expansion has geopolitical ramifications,” Armony said
Forest clearing for port infrastructure near the Cajueiro community (image: Ingrid Barros)
On the environmental and social impacts of projects, China has demanded more transparency and respect for local legislation in its Latin American projects
However, he noted problems including the violation of indigenous and traditional people’s rights in projects with Chinese involvement in the region:
“There is a dark side of China’s expansion in the global South.”
Aldem Bourscheit is a Brazilian journalist covering environmental issues
Select from our bespoke newsletters for news best suited to you
We’ve sent you an email with a confirmation link
我们向您的邮箱发送了一封确认邮件,请点击邮件中的确认链接。如果您未收到该邮件,请查看垃圾邮件。
If you would like more information about the terms of our republication policy or permission to use content, please write to us: [email protected]
We use cookies to ensure that we give you the best experience on our website. By continuing to use our site, you are agreeing to our use of cookies. Read our privacy and cookies policy for further information
Dialogue Earth uses cookies to provide you with the best user experience possible
Cookie information is stored in your browser
It allows us to recognise you when you return to Dialogue Earth and helps us to understand which sections of the website you find useful
Required Cookies should be enabled at all times so that we can save your preferences for cookie settings
Dialogue Earth - Dialogue Earth is an independent organisation dedicated to promoting a common understanding of the world's urgent environmental challenges. Read our privacy policy
Cloudflare - Cloudflare is a service used for the purposes of increasing the security and performance of web sites and services. Read Cloudflare's privacy policy and terms of service
Dialogue Earth uses several functional cookies to collect anonymous information such as the number of site visitors and the most popular pages
Keeping these cookies enabled helps us to improve our website
Google Analytics - The Google Analytics cookies are used to gather anonymous information about how you use our websites. We use this information to improve our sites and report on the reach of our content. Read Google's privacy policy and terms of service
This website uses the following additional cookies:
execute and analyze marketing programs with greater ease and efficiency
while enabling publishers to maximize their returns from online advertising
Note that you may see cookies placed by Google for advertising
under the Google.com or DoubleClick.net domains
Twitter - Twitter is a real-time information network that connects you to the latest stories
opinions and news about what you find interesting
Simply find the accounts you find compelling and follow the conversations
Linkedin - LinkedIn is a business- and employment-oriented social networking service that operates via websites and mobile apps.
T6UP-FSE] has confirmed that the Maria Bonita discovery
which forms part of the Cajueiro project in Para state
2023 when the company released assay results from the first two diamond drill holes completed at the previously untested Maria Bonita target
the company said the intense quartz stockwork veining observed in the first two holes was unlike any other style of mineralization thus far encountered in the Cajueiro area
together with the size of the gold-in-soil anomaly (800 x 800 metres)
suggest that Maria Bonita may have significant bulk-tonnage potential,’’ said Altamira CEO Mike Bennett
the company said a field review of the drill core form the Maria Bonita discovery by renowned expert consultant Dr R
Sillitoe has confirmed the porphyry origin of the mineralization
“Maria Bonita is undoubtedly a porphyry gold deposit as shown by the control of quartz veinlet intensity and gold grade as well as the A-type character of the quartz veinlets,’’ the company said in a press release
Altamira Gold shares were unchanged at 11 cents
The shares are currently trading in a 52-week range of 26 cents and 10 cents
The Cajueiro project is located approximately 75 kilometres northwest of the town of Alta Foresta in the state of Mato Grosso in central western Brazil and is easily accessible by road
Cajueiro hosts an indicated resource of 5.7 million tonnes of grade 1.02 g/t gold (185,000 ounces) and an inferred resource of 12.7 million tonnes of grade 1.26 g/t gold (515,000 ounces)
Maria Bonita is located 7.0 kilometres west of the Cajueiro mineral resource and is also accessible by road
Drilling to date has defined various intercepts of relatively uniform gold mineralization from surface associated with quartz veining and pervasive potassic alteration within a rhyolite intrusive
The best intercept to date is 146 million of 1.0 g/t gold from a depth of 23 metres
“Following the receipt of recent drill results at Maria Bonita
we have moved swiftly to further our understanding of the potential of the Cajueiro district by engaging highly regarded industry specialist consultants,’’ said Bennett
The attribution of a porphyry gold style in the mineralization at Maria Bonita is a very significant development for the company as it is the first discovery of this type in Brazil,’’ he said
“This realization provides a framework within which to interpret the current drill results
allow us to better vector further drilling and also opens up new search areas for mineralized intrusive bodies in the Cajueiro district.’’
and receive alerts when they’re in the news
Proactive financial news and online broadcast teams provide fast
informative and actionable business and finance news content to a global investment audience
All our content is produced independently by our experienced and qualified teams of news journalists
Proactive news team spans the world’s key finance and investing hubs with bureaus and studios in London
We are experts in medium and small-cap markets
we also keep our community up to date with blue-chip companies
commodities and broader investment stories
This is content that excites and engages motivated private investors
The team delivers news and unique insights across the market including but not confined to: biotech and pharma
crypto and emerging digital and EV technologies
Proactive has always been a forward looking and enthusiastic technology adopter
Our human content creators are equipped with many decades of valuable expertise and experience
The team also has access to and use technologies to assist and enhance workflows
Proactive will on occasion use automation and software tools
all content published by Proactive is edited and authored by humans
in line with best practice in regard to content production and search engine optimisation
Altamira Gold Corp is focused on the exploration and development of gold projects within western central Brazil
The company holds 8 projects comprising approximately 190,000 hectares
within the prolific Juruena gold belt which historically produced an estimated 7 to 10 million ounces of placer gold
Altamira's advanced Cajueiro project has NI 43-101 resources of 5.66 million tons at 1.02 grams per ton (g/t) gold for a total of 185,000 ounces in the Indicated Resource category and 12.66 million tons at 1.26 g/t gold for a total of 515,000 ounces in the Inferred Resource category
Altamira Gold Corp. (TSX-V:ALTA, OTC:EQTRF) said drilling at the Maria Bonita target on the Cajueiro gold project in Brazil continues to expand the discovery
The company said a recently completed deep motorized auger drilling program over the Maria Bonita discovery has extended the footprint of the gold mineralization in weathered bedrock to the north
and west of the mineralized area defined by earlier exploration
A total of 47 auger holes were completed comprising an aggregate of 430 metres
266 samples or 62% of the sample population returned greater than 0.5 grams per ton of gold and 39 auger holes or 83% of the total holes drilled returned gold mineralization greater than 0.5 grams per ton
Altamira Gold Corp. (TSX-V:ALTA, OTC:EQTRF)'s Santa Helena porphyry prospect in Brazil is “as good as it gets in terms of drill readiness”
that’s according to consultant geologist Darren Jones
The assertion from Jones comes as Altamira today told investors that it has defined additional targets at the project where work to date has included ground magnetics and in-soil exploration
Altamira Gold Corp has provided an update on its ongoing exploration program for copper and gold at the Santa Helena project in Mato Grosso State
saying the first of four defined copper-in-soil anomalies to be surveyed with ground magnetics reveals a major regional fault trend and arcuate magnetic features
consistent with hydrothermal alteration associated with a porphyry intrusive-type setting
The gold projects explorer and developer said the anomaly has dimensions and a style that are consistent with a porphyry geochemical footprint
The first mover advantage that Altamira Gold Corp (CVE:ALTA) enjoyed for a time in central Brazil
looks like it won’t be long in paying huge dividends
The company has been on the ground in one incarnation or other for some years now in a territory bordered in the north by the south-eastern extreme of Para state
and comprising a large swathe of the central north of Mato Grosso
Altamira Gold CEO Michael Bennett joined Steve Darling from Proactive to share promising updates about the company's ongoing exploration program at the Maria Bonita discovery located on the Cajueiro gold project in northern Brazil
The company's exploration efforts have yielded positive results
with a deep motorized auger drilling program demonstrating an extension of gold mineralization in weathered bedrock in multiple directions around the mineralized area previously defined by initial diamond drilling
The program comes after the successful completion of nine diamond drill holes
which include noteworthy results such as 69 meters at 1g/t in MBA005
These findings highlight the significant gold mineralization potential in the Maria Bonita discovery area
covering an aggregate distance of 430 meters
83% of the total holes drilled exhibited gold mineralization exceeding 0.5g/t Au
The company is now planning a second-stage diamond drill program aimed at exploring the lateral and vertical extents of the mineralized intrusive body
further auger drilling will be conducted to define the limits of the mineralized system
remains open in multiple directions and at depth
Altamira Gold's ongoing exploration endeavors and the promising results obtained so far reflect its commitment to advancing the Cajueiro gold project and unlocking its full potential as a valuable gold asset
The company's strategic focus on exploration and resource expansion positions it well to capitalize on the continued growth in the gold sector
Sign up to receive alerts and news direct to your inbox
OTCQB:CHHYF) CFO Benoit Veilleux talked with Proactive's Stephen Gunnion about a newly signed non-binding term sheet for a $50 million construction capital facility
This agreement is expected to support the first phase of Charbone’s clean hydrogen..
All Rights Reserved - Proactive North America Inc.
Market Indices, Commodities and Regulatory News Headlines copyright © Morningstar. Data delayed 15 minutes unless otherwise indicated. Terms of use
We changed the address of the Stockhouse website from www.stockhouse.com to stockhouse.com
When this page refreshes you will be logged in with the new address
If you have JavaScript enabled then this page should refresh automatically
if it does not then please tap the button below
Proceed to Stockhouse
2020) - Altamira Gold Corp.'s (TSXV: ALTA) (FSE: T6UP) (OTC Pink: EQTRF) ("Altamira" or the "Company") is pleased to announce the appointment of Mr
Edgar Barrios as senior mining consultant and provide an update on progress regarding the development of the Cajueiro Gold Project located in the state of Mato Grosso
Edgar brings a wealth of knowledge and extensive experience on small and large scale gold operations in South America
Not only has he held senior operating roles at larger companies
he is a metallurgist by training and has hands on experience in designing and installing carbon-in-leach circuits and operating plants
His technical expertise will be invaluable as we advance our Cajueiro gold project into production."
Edgar Barrios has over 30 years experience in the construction and management of various gold mining operations
he has worked for Montebelo SRL as General Operations Manager in La Lupa gold mine
Bolivia which includes an operating underground mine and a 1000 t/d gold gravity processing plant
Prior to that he was Administrative General Manager of the Guapurutu gold mine
From 2017 to 2019 he was the General Manager & Operations manager of Eaglecrest Exploration Bolivia S.A.
and responsible for an operating underground gold mine and 150t/d gold gravity processing plant
he worked in Peru as Vice President of Standard Tolling Corp.
managing the design and construction of the 350t/d gold processing plant (CIL process) in Minera La Quinua
Previously he has served as a Director and Vice President of Empresa Minera Paititi S.A
(Bolivian subsidiary of Orvana Minerals Corp.) and has also worked as Metallurgist
Mill Superintendent and General Superintendent of several operational units of Compañía Minera del Sur from 1985 to 2001
Barrios has a degree in Metallurgy from San Austin University of Arequipa
and a MBA from UPSA University of Santa Cruz
he has been involved with the preparation of numerous project studies
commissioning operations and optimization processes in Bolivia with base metals (lead
tin in flotation and gravity concentration) precious metals (gold and silver by CIL process and gravity recovery)
Project management work and engineering and design work is now in progress under Mr
Construction of the plant is scheduled to commence in H2 2020
the Company is collecting four additional bulk samples of oxide ore from the Cajueiro project which will be sent for further metallurgical evaluation in order to ensure that the plant design is optimised for maximum gold recovery
Samples are being sent to the CSIRO lab in Australia to determine whether fine gold in the oxide ore is amenable to recovery using thiosulphate solution which would avoid the requirement for cyanidation
the owners of the powerline which crosses the central resource area of the Cajueiro Project
to draw power from the existing transmission line and install a 1.5 MV sub station
the initial payment of US$1M required pursuant to the April 24
2020 Precious Metals Purchase Agreement between the Company and Metalstream has been rescheduled from 23th June until 14th July 2020
The Company's advanced Cajueiro project has NI 43-101 resources of 5.66Mt @ 1.02 g/t gold for a total of 185,000 oz in the Indicated Resource category and 12.66Mt @ 1.26 g/t gold for a total of 515,000oz in the Inferred Resource category
A total of 14,000m of drilling (105 holes) and over 4,000m of trenching have been completed to date within 285ha in the central part of the 28,577ha claim package (or 1% of the Cajueiro project area)
Numerous other gold-in-soil anomalies remain untested
A production decision at Cajueiro is not based on a feasibility study of mineral reserves demonstrating economic and technical viability
and as a result there is increased uncertainty and there are multiple technical and economic risks of failure which are associated with this production decision
include areas that are analyzed in more detail in a feasibility study
such as applying economic analysis to resources and reserves
more detailed metallurgy and a number of specialized studies in areas such as mining and recovery methods
In accordance with NI 43-101 and the companion policy to that instrument
Altamira cannot provide any guidance either in terms of anticipated gold production or net cash flows
The Company wishes to announce that it has retained Proactive Investors LLC ("Proactive Investors") to assist in creating video content and news articles on the Company's developments
Proactive Investors is a financial news and events organization with bureaus in North America
The agreement has an annual cost of C$18,000 and a 12-month term
Proactive Investors have no present interest
Neither the TSX Venture Exchange nor it's Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release
The Company is focused on the exploration and development of gold projects within western central Brazil
The Company holds 9 projects comprising approximately 280,000 hectares
Statements in this document which are not purely historical are forward-looking statements
including any statements regarding beliefs
expectations or intentions regarding the future
It is important to note that actual outcomes and the Company's actual results could differ materially from those in such forward-looking statements
we do not undertake to update these forward-looking statements
New Age Metals is a green metals, mineral exploration company focused on the exploration and development of platinum group metals and lithium. The Company is completing a Pre-Feasibility Study on its flagship River Valley PGM Project, one of the largest... LEARN MORE
This website is using a security service to protect itself from online attacks
The action you just performed triggered the security solution
There are several actions that could trigger this block including submitting a certain word or phrase
You can email the site owner to let them know you were blocked
Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page.