A wooden drum from a "slack-belt" hoist (widely used in Caribou mines during the early mining days) and a boiler that supplied steam to activate the hoist and pumps, stand in the foreground on a hill near Caribou in Boulder County, Colorado. Pine...
Mining equipment--1940-1950.; Boulder County (Colo.)--1940-1950.; Caribou (Colo.)--1940-1950.; Boilers--1940-1950.; Hoisting machinery--1940-1950.
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