
1) Silver mine in Chile
Found on
https://www.crosswordclues.com/clue/arqueros

Arqueros is a mining district in the Chilean Norte Chico region. It is located 7 km northwest of the Talcuna copper district. The discovery of silver at Arqueros in the 1830s led the Norte Chico mountains north of La Serena to be exhaustively prospected sparkling the Chilean silver rush in the 1830s and 1840s. ...
Found on
http://en.wikipedia.org/wiki/Arqueros
No exact match found.