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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
Phone  ...  Subscription required
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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
Processing
  • Gravity separation
  • Heap leach
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
The São Francisco gold mine had been in operation over 10 years and, has been in Care & Maintenance since 2016.
The site has a production plant already installed and most of the permits in order to restart in case it succeeds proving additional Gold deposits during a new geological campaign. Synergies with the EPP Complex are expected in case of a restart once it is 85 KM from the EPP complex.
During 2020 a limited drilling program is planned to investigate potential new updated resources and establish an updated reserve.


Owners

Source: p. 8
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.

Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein


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


Processing

  • Gravity separation
  • Heap leach
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

The Sao Francisco Mine is an open-pit operation that is designed to send a steady feed of crushed gravity leach ore (“CGO”), on a daily basis, to the gravity circuit while lower grade material that was the run-of-mine dump leach ore (“DLO”) is now being stockpiled and will be run through the plant at the end of the mine life.

The Sao Francisco Mine’s mineral processing system consists of a gravity concentration circuit combined with a multi-lift, heap leach operation. During 2011, the two categories of lower grade material were stockpiled separately. Sub-marginal grade is material between 0.15 g/t Au to 0.25 g/t Au, low grade is material between 0.25 g/t Au to 0.40 g/t Au. CGO or high grade is material above 0.40 g/t Au. The CGO is processed by crushing and gravity concentration, followed by heap leaching of the tailings product from the circuit.

The crushing circuit consists of three stages of crushing and has been designed to generate a product of 30% passing le ........

Recoveries & Grades:

CommodityParameter2017201620152014
Gold Head Grade, g/t 0.650.540.560.67
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Production:

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

Operational Metrics:

Metrics2017201620152014
Tonnes processed  ......  Subscription required2,922,540 t3,944,557 t4,250,691 t
Total tonnes mined  ......  Subscription required2,169,694 t6,905,057 t9,027,336 t
Ore tonnes mined  ......  Subscription required1,967,530 t4,098,327 t3,835,332 t
Waste  ......  Subscription required202,164 t2,806,730 t5,192,004 t
Stripping / waste ratio  ......  Subscription required0.1 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:

CommodityUnits2017201620152014
Cash costs Gold USD 971 / oz 892 / oz 979 / oz 1,134 / oz

Financials:

Units20162015
Capital expenditures M USD  ......  Subscription required
Revenue M USD  ......  Subscription required 68.9  


Heavy Mobile Equipment:

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Jul 16, 2020
Subscription required - Subscription is required.

Staff:

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

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Management Discussion & Analysis 2017
Annual Information Form 2016
Management Discussion & Analysis 2016
Annual Information Form 2015
Management Discussion & Analysis 2015
Technical Report 2012
Subscription required - Subscription is required.

Aerial view:

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