Marcobre S.A.C. is a Peruvian mining company owner of the Mina Justa copper project. The company is a wholly-owned subsidiary of Cumbres Andinas S.A., a subsidiary of Minsur S.A. and ultimately controlled by the Breca conglomerate. It is currently focused on assessing the results of the feasibility study for the project and it has secured approval for the environmental impact assessment. Mina Justa's copper oxide and sulphides resource estimate is 388.3 metric tons, with a 0.71% Cu concentration. Marcobre was founded in 2004 and is based in San Isidro, Peru.