Freibergite on chalcopyrite with chalcopyrite, dolomite, pyrite : Colorado, Eagle County, Gilman, Eagle Mine 20-28 Level
The mineral specimen comes from the Eagle Mine, located near Gilman in the Gilman mining district, Eagle County, Colorado. Rich silver-lead carbonate ores were discovered in the Gilman area around 1879. By the early 1880s a number of the area's mines were producing silver and gold. District production of these metals declined by the 1890s and lead and zinc became the district's primary products by the early 1900s. In 1912 the New Jersey Zinc Company consolidated some of the mines on Battle Mountain into the Eagle Mine, which became Colorado's major zinc producer. The Mine also became known for ...
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