Works of "Research Collection"
Place Collected: Naica Mine
Place Collected: Erupcion Mine
Place Collected: 15th level, Ojuela Stope
Place Collected: San Jorge Stope
Place Collected: Ojuela Mine
Place Collected: dump near North Shaft
Place Collected: Encantado Mine
Place Collected: Ahumada Mine
Place Collected: dump near North Shaft
Place Collected: Cerro De Mercado
Place Collected: 10th Level Main Silicate Orebody
Place Collected: Bilbao Mine