Filters: Tags: Cold Spring Mine (X)

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Looking east at the Cold Spring mine. Boulder County, Colorado. 1930. Looking east at the Cold Spring mine. Boulder County, Colorado. 1930. Categories: Image; Tags: Boulder County, Colorado, Cold Spring Mine, Lovering, T.S. Collection, Mills, Mines, Quarries, Photographers, All tags... photo print, Fewer tags Vein of high-grade tungsten ore, fourth level of the Cold Spring mine. Boulder County, Colorado. Circa 1930. Vein of high-grade tungsten ore, fourth level of the Cold Spring mine, the ore is wider than the average of the vein. The black material assays 40 to 60 percent WO3. Boulder County, Colorado. Circa 1930. Figure 53, in U.S.Geological Survey Professional paper 245. 1953. Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Boulder County, Colorado, Cold Spring Mine, Lovering, T.S. Collection, Mills, Mines, Quarries, Photographers, All tags... photo print, Fewer tags Altered wall rock adjacent to the Cold Spring vein, fifth level of the Cold Spring mine. Boulder County, Colorado. Circa 1930. Altered wall rock adjacent to the Cold Spring vein, fifth level of the Cold Spring mine. The inner edge of the sericitized casing is at the edge of the vein, at the point of the hammer and the outer edge is about 2 inches to the right of the end of the hammer handle. Boulder County, Colorado. Circa 1930. Figure 55, in U.S.Geological Survey Professional paper 245. 1953. Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Boulder County, Colorado, Cold Spring Mine, Lovering, T.S. Collection, Mills, Mines, Quarries, Photographers, All tags... photo print, Fewer tags