Joshua Tree National Park -
Geology Tour Road:
Mines in the Hexie Mountains
The Hexie Mountains slopes are riddled with mine tunnels and shafts dug by miners in search
of gold and other precious metals. Extensive mining activity took place in the late 1800's
and early 1900's, however, very few of the mines produced ore of a high enough grade to be
Metals of economic importance, such as gold, silver copper and lead are belived to be deposited
when intruded magma cools and crystalizes along with gasses and liquid solutions rise.
The Blue Cut fault zone was believed to have created pathways in which solutions reacted with
metal-bearing quartz veins.
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