View of The Mine and Smelter Supply Company building, Denver, Colorado. It is a three story brick building with a decorative cornice and advertisements in many of the windows. They read in part: "Pipe fitting, Brass goods, Machinery supplies,...
View of the remains of the Humphrey Concentrator near North Clear Creek, Black Hawk, Gilpin County, Colorado.
Gravity concentrators--Colorado--Blackhawk--1940-1960.; North Clear Creek (Gilpin County-Jefferson County, Colo.)--1940-1960.; Blackhawk (Colo.)--1940-1960.; Mining--Colorado--Blackhawk--1940-1960.; Ruins--Colorado--Blackhawk--1940-1960.
[between 1940 and 1960
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