Complex ore deposits are spatially associated with granitic bodies of Precambrian age in the Lake George area, Colorado. They include greisens that contain high
concentrations of beryllium and subordinate amounts of tin, tungsten, and other metals associated with the Redskin Granite. Scheelite deposits in calc-silicate
rocks and greisen deposits near Tappan Mountain that contain tin and tungsten minerals are associated with the Silver Plume (?) Granite. Samples of stream sediments and soils locally show anomalous concentrations of beryllium, tin, copper, lead, and molybdenum. Some of the areas of anomalous concentrations correlate with known deposits; others do not, and this fact suggests that further prospecting is warranted.
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USGS Numbered Series
Distribution of beryllium, tin, and tungsten in the Lake George area, Colorado