Status in production
Location Minas Gerais State, Brazil
Reserves 556 Koz @ 0.99 g/t gold
M&I Resources 132 Koz @ 1.27 g/t gold 1
Inferred Resources 226 Koz @ 1.95 g/t gold
Mining Style open pit with cil plant
RDM experienced a number of operating disruptions in Q1 and Q2 2022 as the result of regulatory issues related to the mine’s tailings storage facility. In July the company decided to focus on processing low-grade stockpiles and owner mining to reduce costs while the tailings storage facility raise is underway. As a result, RDM production will be lower in 2022 than in normal years, with a forecast of 25,000 to 35,000 ounces of gold production for the year.
The RDM mine is located in Minas Gerais State, Brazil, about 560 kilometres north of the state capital city of Belo Horizonte. The mine area covers approximately 22,600 ha and is accessible by air and road. It was acquired by Brio Gold in April 2016 and subsequently acquired by Leagold in May 2018. The operation is a conventional open pit mine with a 7,000 t/d carbon-in-leach (CIL) plant.
Geology and Mineralization
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 which underlies more than one million square kilometres 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 the gold mineralization is the quartz-muscovite schist of the Riacho dos Machados Group. 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.