View of the first Slide mill on the south side of Left Hand Canyon, Boulder County, Colorado. It is perched on the side of a steep hill with a large tailings pile above it and to the side. In the 1930s, the sixty foot timber wall of the mine's...
Tailings embankments--Colorado--Boulder County--1890-1900.; Boulder County (Colo.)--1890-1900.; Left Hand Canyon (Colo.)--1890-1900.; Mills--Colorado--Boulder County--1890-1900.; Mining--Colorado--Boulder County--1890-1900.
View of the Happy Valley Placer Co. mining camp in the Grand Island Mining District, Boulder County, Colorado with tents and a buggy. John H. Kemp leans on the fence to the left; Engineer August Mathez stands with a transit instrument and tripod...
Happy Valley Placer Company (Colo.)--Facilities--1890-1900.; Mining camps--Colorado--Boulder County--1890-1900.; Boulder (Colo.)--1890-1900.; Mining--Colorado--Boulder County--1890-1900.; Tents--Colorado--Boulder County--1890-1900.; Kemp, John H.;...