Black Rock Underground. Black Rock Mine Operations BRMO Assmang Proprietary Limited is a joint venture mining company that operates in South Africa. In total it excavates and produces 36 million tons of iron and manganese ore per year across its three separate mine shafts.
The mine has a projected maximum capacity of 63 mtpa and a life of 30 years or more. BLACK ROCK UNDERGROUND LLC. Black Rock Mine Operations BRMO Assmang Proprietary Limited is a joint venture mining company that operates in South Africa.
WASHINGTON FOREIGN LIMITED-LIABILITY COMPANY.
Black Rock Underground LLC Hillsboro Oregon. Call Black Rock Underground today 1-503-747-9312. Assmang Black Rock Mine Operations BRMO is one of two underground manganese ore mine operations in South Africa mining both oxide and semi-carbonate ores. 267 Ne 34th Pl Hillsboro OR 97124-6703.