RDM Gold Mine
Producing gold in Brazil
RDM commenced operations in 2014 as an open pit mine.
Snapshot
Ownership
100%
Location
Minas Gerais, Brazil
2024 Production1
50,000 – 60,000 oz gold
2024 Costs1
$1,800 – $1,900 per oz AISC
Reserves
556 Koz @ 0.99 g/t gold
M&I Resources2
132 Koz @ 1.27 g/t gold
Mining and processing
Open pit / CIL plant
Estimated mine life
~5 years with existing reserves
1. Guidance released on August 7, 2024.
2. M&I Mineral Resources are exclusive of Mineral Reserves. See Operations / Reserves & Resources and Cautionary Notes.
Overview
RDM is located in Minas Gerais State, Brazil, about 560 km north of the state capital city of Belo Horizonte. Equinox Gold assumed ownership of RDM in March 2020 through its acquisition of Leagold Mining.
The RDM deposit was discovered in 1986 and operated as an open-pit heap leach mine until 1997. Operations recommenced with a carbon-in-leach (CIL) plant in early 2014, producing around 60,000 ounces of gold per year. RDM experienced a number of operating disruptions in Q1 and Q2 2022 as the result of regulatory issues related to the expansion of the mine’s tailings storage facility. In July 2022, Equinox Gold made the decision to focus on processing low-grade stockpiles and perform owner mining to reduce costs while the tailings storage facility expansion is underway. As a result, RDM production was lower and costs higher in 2022 than in normal years. For 2023, Equinox Gold has resumed owner-operated mining but on a smaller scale than in previous years to reduce capital costs.
Production at RDM in 2024 is forecast at 50,000 to 60,000 ounces of gold at all-in sustaining costs between $1,800 to $1,900 per ounce of gold sold. Budgeted sustaining expenditures at RDM of $29 million in 2024 include $5 million for TSF costs and $22 million of equipment expenditures and rentals. Budgeted non-sustaining expenditures of $14 million in 2024 relate primarily to capitalized stripping.
Operating Data
| 2023 Actuals | 2022 Actuals | 2021 Actuals | |
|---|---|---|---|
| Gold produced (oz) | 52,614 | 32,139 | 58,829 |
| Cash costs ($/oz) | 1,199 | 1,418 | 1,222 |
| AISC ($/oz) | 1,612 | 1,681 | 1,410 |
| Sustaining capital ($M) | 11 | 8 | 10 |
| Growth capital ($M) | – | 23 | 22 |
Mining and Processing
Mining is performed with conventional truck and shovel operations at a rate of approximately 2.9 Mt per year with a strip ratio of approximately 7:1 (waste:ore). While open-pit mining has historically been performed by a mining contractor, in Q3 2022 RDM transitioned to owner-operated mining to reduce costs.
Ore is delivered to an 8,000 tonnes-per-day crushing and grinding circuit and is processed with gravity concentration and a standard CIL plant. Gold recovery averages around 86%.
Tailings and Waste Management
Two core elements of our responsible mining strategy are to protect the health and safety of our workforce and local communities, and to minimize and mitigate our impact on the environment. That includes ensuring mine waste, such as waste rock and tailings, is safely managed, and that all of our waste rock and tailings storage facilities (TSFs) are properly designed, physically and chemically stable for long-term storage, and routinely inspected and audited.
Brazilian Law 12,334/2010 establishes the National Dam Safety Policy. As outlined in Article 12, paragraph 1 (amended by Law 14,066/2020), companies responsible for dams are required to make their Emergency Action Plan publicly available on their websites. This regulation ensures that local communities, regulatory agencies, and other stakeholders have access to essential information about emergency response actions. In compliance with this legal requirement, the Emergency Action Plans for Tailings Dams for Equinox Gold’s Mineração Riacho dos Machados (RDM Mine), Santa Luz Desenvolvimento Mineral (Santa Luz Mine), Fazenda Brasileiro Desenvolvimento Mineral (Fazenda Mine), and Mineração Aurizona (Aurizona Mine) are posted below for public review. The Emergency Action Plans are posted in Portuguese, the language of the local communities for whom the Emergency Action Plans are relevant.
A legislação brasileira nº 12.334/2010, que define a Política Nacional de Segurança de Barragens, determina (artigo 12, parágrafo 1º – alterado pela Lei nº 14.066/2020), que o Plano de Ação de Emergência (PAE) deve estar disponível no website da empresa responsável pela barragem, acessível ao público. Essa normativa visa garantir que as comunidades locais, órgãos fiscalizadores e demais partes interessadas tenham acesso direto e compreensível às informações relacionadas às ações de resposta em situações de emergência.
Em atendimento a essa exigência, os Planos de Ação de Emergência para Barragem de Mineração – PAEBM’s das barragens da Mineração Riacho dos Machados (RDM), Santa Luz Desenvolvimento Mineral (Santa Luz), Fazenda Brasileiro Desenvolvimento Mineral (Fazenda) e Mineração Aurizona (Aurizona) estão disponíveis em língua portuguesa para consulta dos interessados. Os Planos de Ação de Emergência são publicados em português, o idioma das comunidades locais para as quais os Planos de Ação de Emergência são relevantes.
Download the Emergency Action Plan pART 1Download the Emergency Action Plan PART 2
Exploration and Geology
The RDM gold deposit occurs in the north-south trending Araçuaí Fold-Thrust Belt along the eastern margin of the São Francisco Craton, a major Archean-age basement block that underlies more than one million square km in eastern Brazil. The Araçuaí Fold Belt is 15 km to 45 km wide and consists of a series of meta-volcanic/meta-sedimentary rocks of late Archean to late Proterozoic age.
The principal host for RDM gold mineralization is the quartz-muscovite schist of the Riacho dos Machados Group (RMG). The mineralization occurs in a belt of hydrothermally-altered rock developed along a district-scale shear zone. Mineralization occurs in the hydrothermal/shear zone and gold grades are closely related to the sulphide content, especially arsenopyrite.
Exploration at RDM under previous ownership was negligible. Open pit expansion potential exists along trend to the north and south and underground potential exists down dip where mineralization has been intersected by widely spaced drill holes. In addition, the mine is located on a 30-km trend of alteration and mineralization in the RMG that has not been comprehensively drill tested.
Operating Mines
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Equinox Gold has seven operating mines in the USA, Canada, Mexico and Brazil.
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