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Brazil
Sao Francisco Mine

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 Location:
55 km NW from Pontes e Lacerda, Brazil

  Regional Office:
Faz Ernesto Soares de Carvalho - s/n
Pontes e Lacerda
Brazil
78250-000
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start...
The São Francisco Gold Mine (“São Francisco”) – part of EPP Mines, an open-pit heap leach gold mine located in the southwest of the state of Mato Grosso, Brazil. Currently, the mine is in care and maintenance.

In Sao Francisco, Aura is evaluating the potential to restart the mine.


Owners

Source: p. 15
CompanyInterestOwnership
Aura Minerals Inc. 100 % Indirect
The Mine’s surface and mineral rights are owned by Mineração Apoena S.A. (“Apoena”), a beneficially-owned indirect subsidiary of Aura.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Breccia pipe / Stockwork


Summary:

The Sao Francisco Mine is a shear hosted lode gold deposit. It is epigenetic, structurally controlled, and composed of narrow, 1 to 5 cm wide, quartz veins containing free gold. The veins and vein systems and stockworks both parallel and crosscut the bedding planes and appear to represent separate but closely related ineralizing events.

The local rocks at the Sao Francisco Mine have been subjected to low-grade metamorphism. They consist of fine to coarsegrained meta-arenites (metamorphic sandstones), with locally reddish-coloured metapelites (metamorphic mudstones) and occasionally metaconglomerates (old pebble beds) of the Fortuna Formation, the basal unit of the Aguapeí Group. The metaconglomerates are composed of quartz pebbles and grains set in a siliceous sandy matrix. Primary sedimentary structures such as cross-bedding, graded bedding, and ripple marks are commonly observed.

Mineralization is enclosed by a hydrothermal alteration zone (“HAZ”). The HAZ occurs as a regular steeply dipping tabular zone; the depth of the HAZ has yet to be defined by drilling. Alteration associated with mineralization in the HAZ consists of silicification and occasional sericite and chlorite.

The gold occurs as free gold and frequently as coarse nuggets measuring several millimeters in diameter with the quartz, as laminations along the fracture planes, and within limonite boxwork after pyrite and arsenopyrite.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining at the Sao Francisco Mine is carried out by contractors using a combination of hydraulic excavators, front end loaders, and 35 t haulage trucks with typical pit support equipment to sustain the operation. The pit is accessed via a standard access road or ramp 15 m wide at a minus 10% grade which provides access to the benches. Benches are 10 m high, with alternating 4.3 and 10 m wide safety berms.

Production drilling is carried out with 5.5 inch diameter holes and patterns for waste and ore of 6 x 4 m and 3.5 x 4.5 m, respectively. Standard bench height is 10 m, with one meter of sub-grade drilling for floor control.


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2017201620152014
Gold oz 8,73944,43359,46184,959
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics2017201620152014
Tonnes processed 302,669 t2,922,540 t3,944,557 t4,250,691 t
Total tonnes mined 2,169,694 t6,905,057 t9,027,336 t
Ore tonnes mined 1,967,530 t4,098,327 t3,835,332 t
Waste 202,164 t2,806,730 t5,192,004 t
Stripping / waste ratio 0.1 0.68 1.35

Reserves at December 31, 2016:

CategoryTonnage CommodityGradeContained Metal
Proven 11,600 kt Gold 0.45 g/t 197 koz
Probable 41,400 kt Gold 0.76 g/t 1,010 koz
Proven & Probable 53,000 kt Gold 0.69 g/t 1,177 koz
Measured 525,770 kt Gold 0.78 g/t 13,140 koz
Indicated 352,240 kt Gold 0.84 g/t 9,513 koz
Measured & Indicated 878,000 kt Gold 0.8 g/t 22,650 koz
Inferred 119,100 kt Gold 0.68 g/t 2,620 koz

Commodity Production Costs:

CommodityUnits201720162015
Cash costs Gold USD 971 / oz   892 / oz   979 / oz  

Financials:

Units2016
Capital expenditures M USD 0.2  
Revenue M USD 56.7  



Heavy Mobile Equipment:

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Aug 18, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2016
Subscription required Subscription required Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Management Discussion & Analysis 2018
Management Discussion & Analysis 2017
Annual Information Form 2016
Management Discussion & Analysis 2016
Annual Information Form 2015
Management Discussion & Analysis 2015
Technical Report 2011
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