Capstone Mining Corp. is a Canada-based mining company. The Company is engaged in the production of and exploration for base metals in the United States, Mexico, Canada and Chile, with a focus on copper. The Company's segments include individual mining operations of Pinto Valley (the United States), Cozamin (Mexico), Minto (Canada), Santo Domingo development project (Chile) and other. Its subsidiary, Pinto Valley Mining Corp., owns and operates copper Pinto Valley Mine located in Arizona, the United States. Capstone Gold, S.A. de C.V., its Mexican subsidiary, owns and operates copper-silver Cozamin Mine located in Zacatecas, Mexico. Minto Explorations Ltd., its Canadian subsidiary, owns and operates copper Minto Mine located in Yukon, Canada. Capstone Mining Chile SpA, its Chilean subsidiary, is performing exploration for base metal deposits in Chile. Minera Santo Domingo SCM, a Chilean subsidiary, holds the Santo Domingo copper-iron project in Chile.