Gold & limonite (brownish) from southern Colorado’s Buckhorn Mine, one of several old gold mines in the Crystal Hill Mining District.  The area is in the mountains on the western flank of the Rio Grande Rift Zone.  The Buckhorn Mine principally produced gold and silver, plus small amounts of a few other metals.  Mineralization is associated with Tertiary-aged igneous intrusions and rift-related faults that cut through Precambrian gneisses.

Locality: Buckhorn Mine, Crystal Hill Mining District, south-central Saguache County, southern Colorado, USA.

(CSM # TM 12158, Colorado School of Mines Geology Museum, Golden, Colorado, USA)



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