Several unidentified men stand outside the Iron City Stamp Mill in Blackhawk, a mining town in Gilpin County, Colorado. The tracks of the Gilpin Tramway, which was used to haul ore from nearby mines to the depot in Blackhawk, cross the foreground....
mortars and amalgamated with the gold in the ore. The stamps were periodically stopped and the amalgam was retrieved and then sold to banks or the mint.; The interior of a stamp mill, possibly the Iron City Stamp Mill in Blackhawk, Colorado, shows...
Ore-dressing plants--Colorado--Blackhawk--1870-1910.; Ore-dressing--Colorado--Blackhawk--1870-1910.; Blackhawk (Colo.)--1870-1910.; Gilpin County (Colo.)--1870-1910.; Gold mining--Colorado--Blackhawk--1870-1910.
[between 1935 and 1950?]
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