Dolores is an open-pit and underground silver-gold mine owned and operated by Compañía Minera Dolores S.A. de C.V., a wholly owned subsidiary of Pan American Silver Corporation (“Pan American”). Dolores is located in Chihuahua state, Mexico, approximately 240 kilometers west of the city of Chihuahua.

Construction of the mine began at the end of 2006, the first doré was produced in November 2008, and commercial production began in May 2009. The processing facilities include a crushing plant, conveying and stacking facilities, leach pads, solution ponds, and Merrill-Crowe and refining facilities. Pan American completed an expansion of the Dolores mine in 2017 that featured a pulp agglomeration plant to process high-grade ore from a new underground mine, together with the high-grade portion of the ore from the open-pit mine.

Dolores has reached the end of its life. Mining concluded in July 2024 and stacking of ore on the leach pad concluded in Q1 of 2025. The mine has now entered the residual leaching phase.