Idaho Springs serves as the hub of a landscape defined by its subterranean riches, where the legacy of hard-rock mining is etched into every gulch and mountain face. The northern half of the quadrangle is a dense network of claims and workings, including the landmark Argo Mill and the Colorado School of Mines Experimental Mine. Settlements like Freeland and Lamartine are surrounded by a high concentration of vertical shafts and horizontal tunnels, such as the Morgan Shaft and Tunnel Mine and the Giant Warrior Shaft Mine, illustrating the intense industrial extraction that shaped this part of the Front Range.
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1899 · West Denver
USGS Topo · 1:125,000
1903 · Georgetown
USGS Topo · 1:62,500
1905 · Central City
USGS Topo · 1:62,500
1905 · Georgetown
USGS Topo · 1:62,500
1906 · Blackhawk
USGS Topo · 1:62,500
1910 · Central City
USGS Topo · 1:62,500
1912 · Central City
USGS Topo · 1:62,500
1942 · Central City
USGS Topo · 1:24,000
1942 · Black Hawk
USGS Topo · 1:24,000
1944 · Black Hawk
USGS Topo · 1:31,680