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Brazil
Riacho dos Machados (RDM) Mine

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 Location:
11 km SW from Riacho dos Machados, Brazil

  Regional Office:
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
Production Start...
Mine Life7 years (as of Jan 1, 2020)
May 16, 2022 - Equinox Gold Corp. (TSX: EQX) (NYSE American: EQX) ("Equinox Gold" or the "Company") announces that, as previously disclosed, permits for the scheduled tailings storage facility ("TSF") raise at the Company's RDM Mine in Brazil have been delayed. Equinox Gold has temporarily suspended RDM operations until this matter can be resolved.

May 31, 2022 - Equinox Gold Corp. announces that approval for the tailings storage facility ("TSF") raise at its RDM Mine in Brazil has been received. The TSF raise contractor is mobilizing equipment to begin the raise in early June.

Equinox Gold expects that full operations will resume by mid-July.


Owners

Source: p. 77
CompanyInterestOwnership
Mineração Riacho Dos Machados Ltda. (operator) 100 % Direct
Equinox Gold  Corp. 100 % Indirect
Riacho dos Machados (RDM) is held under the name of Mineração Riacho dos Machados (MRDM), an indirect wholly owned subsidiary of Equinox Gold, incorporated under the laws of Brazil.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Mesothermal
  • Orogenic
  • Vein / narrow vein


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.

Gold grades in the mineralized zone are closely related to sulphide content, especially arsenopyrite. Gold occurs as microscopic native-gold grains typically finer than 400 mesh (37 µm). The gold grains occur interstitial to quartz grains, muscovite grains, and sulphide grains, and also ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Conventional open pit mining methods are employed at the Mine, including drilling, blasting, loading, and hauling. Waste mining is performed by a contractor, while ore mining is conducted using an owner’s fleet.

The operation’s strip ratio is relatively high, at approximately 6.9:1 (waste:ore). The mining rate will be relatively constant throughout the life-of-mine (LOM); total daily waste material movement is estimated at 70,000 t/d and ore mining at 7,890 t/d (2.88 Mt/a).

Current pit bottom elevations of the north and south ends of the open pit are approximately 717 and 705 masl, respectively, and the crusher elevation is 865 masl. Surface rights cover a sufficient area to locate all the mining infrastructure required for the LOM, including waste management facilities (WMF), TSF, WSF, and processing plant.

Pit dewatering is carried out using in-pit sumps and perimeters wells.

The mine design bench height is 12 m; however, mining occurs on 4 m lifts in waste and 3 m lifts in ore.

The final pit design is approximately 1,750 m long and 750 m wide, with elevations that range from 600 to 900 masl. Final pit exits for the south and north ramps are at approximately 860 masl. The crusher dump pocket is less than 500 m horizontal distance from the pit exit. Adequate buffers exist around the open pit for possible future expansion, for example if the gold price increases. Some condemnation holes have been drilled in the infrastruc ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required574348
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required2,458,895 t1,390 kt1,723,506 t1,054,574 t
Waste  ......  Subscription required  ......  Subscription required
Stripping / waste ratio  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required2,548,393 t1,958 kt1,253,329 t850,029 t
Daily processing capacity  ......  Subscription required  ......  Subscription required7,000 t7,000 t
Annual processing capacity  ......  Subscription required  ......  Subscription required2.55 Mt2.55 Mt
Subscription required - Subscription is required.

Reserves at December 31, 2020:
Mineral Reserves are reported at a cut-off grade of 0.33 g/t gold.
Open pit Mineral Resources are reported at a cut-off grade of 0.30 g/t gold. Underground Mineral Resources are reported at a cut off grade of 1.36 g/t gold.

CategoryTonnage CommodityGradeContained Metal
Proven 11,681 kt Gold 0.96 g/t 360 koz
Probable 5,872 kt Gold 1.04 g/t 196 koz
Proven & Probable 17,553 kt Gold 0.99 g/t 556 koz
Measured 264 kt Gold 1.19 g/t 10 koz
Indicated 2,981 kt Gold 1.28 g/t 122 koz
Measured & Indicated 3,245 kt Gold 1.27 g/t 132 koz
Inferred 3,614 kt Gold 1.95 g/t 226 koz

Commodity Production Costs:

CommodityUnits202220212020201820172016
Cash costs (sold) Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required 946 / oz  
Cash costs Gold USD 814 / oz   881 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required 1,009 / oz  
All-in sustaining costs (AISC) Gold USD 989 / oz   1,001 / oz  
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

Units2021202020192018
OP mining costs ($/t mined) USD 2.041.762.662.07
OP mining costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2022202120202016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required 17.9  
Revenue M USD  ......  Subscription required  ......  Subscription required 40.5  
Operating Income M USD  ......  Subscription required  ......  Subscription required 1.6  
Subscription required - Subscription is required



Heavy Mobile Equipment as of December 31, 2020:
HME TypeModelSizeQuantityLeased or
Contractor
Backhoe ....................... Subscription required ....................... Subscription required
Dozer ....................... Subscription required ....................... Subscription required Leased
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required Leased
Drill (blasthole) ....................... Subscription required 5.5 inch ....................... Subscription required
Drill (blasthole) ....................... Subscription required ....................... Subscription required Leased
Drill (blasthole) ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required 6 cu. m ....................... Subscription required
Excavator ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required Leased
Grader ....................... Subscription required ....................... Subscription required Leased
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required Leased
Grader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Rockbreaker ....................... Subscription required
Truck (dump) ....................... Subscription required ....................... Subscription required
Truck (dump) ....................... Subscription required 65 t ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required Leased
Truck (haul) ....................... Subscription required ....................... Subscription required Leased
Truck (water) ....................... Subscription required ....................... Subscription required Leased
Truck (water) ....................... Subscription required ....................... Subscription required Leased
Truck (water) ....................... Subscription required ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 31, 2022
....................... Subscription required ....................... Subscription required Subscription required May 27, 2022
....................... Subscription required ....................... Subscription required Subscription required May 27, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
Fact Sheet 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Corporate Presentation 2018
Management Discussion & Analysis 2018
Press Release 2018
Quarterly Report 2018
Technical Report 2018
Corporate Presentation 2017
Management Discussion & Analysis 2017
Financial Review 2016
Management Discussion & Analysis 2016
Year-end Mineral Reserves 2016
Technical Report 2015
Other 2013
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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