Volcan Comapania Minera S.A.A.
- Operating mainly in Junin, produces zinc, silver lead, copper, and gold.
- http://www.volcan.com.pe/

San Martin Mining and Construction
- Includes company history and profile, business and clients information, and equipment, environment and safety details.
- http://www.msmartin.com.pe/

Compañía de Minas Buenaventura S.A.A.
- Producing precious metals and holding mining rights in Peru, focusing on exploration and exploitation activities both by its own and through joint ventures. It is also an important shareholder of Minera Yanacocha.
- http://www.buenaventura.com.pe/

Minera Yanacocha
- Mining company operating in Cajamarca. Leading gold producer in Latin America.
- http://www.yanacocha.com.pe/