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Brazil
Riacho dos Machados (RDM) Mine

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 Location:
11 km SW from Riacho dos Machados, Brazil

  Address:
4° Andar Avenida do Contorno 5919 Savassi
Belo Horizonte
Brazil
30110-927
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life8 years (as of Jan 1, 2018)
Latest NewsLeagold Mining Announces Restart of RDM Mine     November 20, 2018


Owners

Source:
CompanyInterestOwnership
Equinox Gold  Corp. 100 % Indirect
On April 29, 2016, Brio Gold completed the acquisition of Mineração Riacho dos Machados (“MRDM”), the owner of the RDM Mine in Minas Gerais, Brazil.
On May 24, 2018, Leagold Mining completed the acquisition of Brio Gold Inc.

Deposit Type

  • Vein / narrow vein
  • Orogenic
  • Mesothermal


Summary:

The Riacho dos Machados gold deposit is considered to be a classic mesothermal orogenic gold deposit in a sheared and deformed Archean to Proterozoic age greenstone belt sequence. It is comprised of metamorphosed volcanic-sedimentary rock units intruded by slightly younger post-tectonic igneous bodies.

The principal host for the gold mineralization is the quartz-muscovite schist of the RMG. The mineralization occurs in a belt of hydrothermally altered rock developed along a district-scale shear zone that extends almost 30 km along a N20°E strike direction and dips 40° to 45° east. The mineralization has a typical amphibolite facies mineral association which is progressively altered to greenschist facies assemblage. The gold mineralization occurs as “stacked” tabular horizons that are mostly concordant with the principal rock foliation (shear zone). These tabular zones typically consist of a main zone which may be sided by a thinner footwall or hanging wall zones, separated by three meters to ten meters of unmineralized rock. Continuity along strike and at depth is good with gold mineralization occurring continuously over a 2,000 m strike length and up to 1,000 m down dip.

Mineralization occurs in the hydrothermal/shear zone and gold grades are closely related to the sulfide content, especially arsenopyrite. Gold occurs as microscopic native-gold grains - typically, finer than 400 mesh (37 microns) - at contacts between recrystallized quartz grains, muscovite grains and as inclusions in arsenopyrite, and less commonly in pyrrhotite, quartzveinlets, tourmaline, and pyrite.

The following minerals and features, listed from high to low importance, are noted as indicators of gold mineralization:

-Arsenopyrite (both anhedral and euhedral needles) -Pyrrhotite
-Abundant quartz veinlets (sheared into foliation plane)
-Pyrite
-Crenulation folding
-Tourmaline veins (fine-grained massive intergrown).

The arsenic content of the mineralization is quite high with an average of approximately 3,935 ppm As for samples greater than 1.0 g/t Au. Silver content is very low with the average Ag/Au ratio equal to 0.5 for samples with a gold concentration of greater than 1.0 g/t Au. Antimony, copper, lead, and zinc are mostly non-anomalous.

The gold mineralization is closely related to the structural fabric. The main mineralizing fluid upward flow was possibly along the thrust movement direction with lateral escape along interconnecting sub-horizontal structural fabric. Brittle deformation at the Riacho dos Machados gold deposit is limited to poorly defined cross-faults which may have anomalous geochemistry but do not host gold mineralization.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Conventional open pit mining methods are employed at the MRDM open pit including drilling, blasting, loading, and hauling.

The bench height is 12 m, however, mining occurs on six meter lifts (flitches) in waste, and three meter lifts in ore. Road widths are 21 m. Berm widths normally are six meters in the oxide and transition ore, eight meters in the hanging wall fresh rock, and 12 m in the footwall fresh rock.


Crushing and Grinding


Processing

  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The processing plant was designed to process 7,000 tpd, with the potential to expand to 9,000 tpd (3.28 Mtpa) with some modifications, using three-stage crushing, ball mill grinding, CIL, sulfur dioxide-air cyanide detoxification, and a gold adsorption, desorption, and recovery (ADR) plant.

The crushing circuit includes a three-stage crushing plant with an availability based on 80% for the crushing circuit. ROM ore is dumped into a feed hopper. A variable speed apron feeder reclaims ore from the feed hopper onto a vibrating grizzly with openings set at 152 mm (6 in). Oversize from the grizzly discharges into the primary Metso model 125 jaw crusher. Undersize from the grizzly combines with the discharge from the jaw crusher onto a conveyor belt. The conveyor belt feeds the primary double deck vibrating screen. Undersize from the screen is conveyed to a fine ore bin via a conveyor belt. Oversize from the screen is fed to the secondary Metso HP-500 cone crusher. Product from th ........

Recoveries & Grades:

CommodityParameter201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 1.021.251.39
Subscription required - Subscription is required.

Production:

CommodityUnits2019201820172016
Gold oz  ......  Subscription required  ......  Subscription required43,11648,246
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019201820172016
Annual processing capacity  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required1,054,574 t
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required850,029 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Total 5,647 kt Gold 0.73 g/t 133 koz
Probable Total 19,079 kt Gold 1.08 g/t 656 koz
Proven & Probable Total 24,726 kt Gold 0.99 g/t 789 koz
Measured Total 3,195 kt Gold 0.77 g/t 79 koz
Indicated Total 36,107 kt Gold 1.02 g/t 1,181 koz
Measured & Indicated Total 39,303 kt Gold 1 g/t 1,259 koz
Inferred Total 8,305 kt Gold 1.5 g/t 401 koz

Commodity Production Costs:

CommodityUnits201820172016
Cash costs (sold) Gold USD  ......  Subscription required
Cash costs Gold USD 814 / oz 881 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required
All-in sustaining costs (AISC) Gold USD 989 / oz 1,001 / oz
Subscription required - Subscription is required.

Operating Costs:

Units2018
OP mining costs ($/t mined) USD 2.07
Processing costs ($/t milled) USD  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2016
Capital expenditures M USD  ......  Subscription required
Revenue M USD  ......  Subscription required
Operating Income M USD  ......  Subscription required


Heavy Mobile Equipment as of May 31, 2018:
HME TypeModelSizeQuantity
Dozer ....................... Subscription required 1
Dozer (crawler) ....................... Subscription required 4
Drill ....................... Subscription required 5.5 inch 2
Drill ....................... Subscription required 2
Excavator ....................... Subscription required 6 cu. m 3
Excavator ....................... Subscription required 3
Grader ....................... Subscription required 2
Grader ....................... Subscription required 2
Shovel ....................... Subscription required 1
Truck (dump) ....................... Subscription required 65 t 10
Truck (haul) ....................... Subscription required 4
Truck (haul) ....................... Subscription required 12
Truck (water) ....................... Subscription required 2
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 26, 2020
....................... Subscription required ....................... Subscription required Subscription required Mar 26, 2020
....................... Subscription required ....................... Subscription required Subscription required Mar 26, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Corporate Presentation 2017
Management Discussion & Analysis 2017
Financial Review 2016
Management Discussion & Analysis 2016
Year-end Mineral Reserves 2016
Technical Report 2015
Subscription required - Subscription is required.

News:

NewsDate
Leagold Mining Announces Restart of RDM Mine November 20, 2018
Leagold Mining Reports Sufficient Water to Support Restart of RDM Mine November 13, 2018
Leagold Mining reports temporary suspension of operations at RDM mine October 10, 2018

Aerial view:

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