Mines and prospects, Idaho Springs district, Clear Creek and Gilpin counties, Colorado -- Descriptions and maps
<p>The Idaho Springs mining district forms an important segment of the Front Range mineral belt, a northeast-trending zone of coextensive intrusive rocks and…
Public-domain full text preserved in the Mountain Man Mining Library. Original source: pubs.usgs.gov.
Mines and prospects, Idaho Springs district, Clear Creek and Gilpin counties, Colorado -- Descriptions and maps Author: Moench, Robert Hadley, Drake, Avery Jr. Year: 1966 Category: Report <p>The Idaho Springs mining district forms an important segment of the Front Range mineral belt, a northeast-trending zone of coextensive intrusive rocks and hydrothermal ore deposits of early Tertiary age. This belt, which is about 50 miles long, extends from the region just west of Boulder southwestward across the Front Range. From 1859, when placer gold was discovered in Idaho Springs and lode gold in Central City, through 1959, ores valued at about <span>$</span>200 million were shipped from a 50-square-mile area that includes the Idaho Springs and adjacent districts to the north, west, an Tags: usgs, Central City Colorado gold Source: ://pubs.usgs.gov/of/1966/0087/plate-31.pdf