A former Au-Ag mine located in the near center of the section in the SW¼ (estimated) sec. 27 (& 32?), T4S, R18E, MDM, 0.5 km (1,600 feet) SW of Colorado School, along Long Canyon Creek, on private and unpatented land. The property consisted of 1 fractional patented claim plus 2 unpatented claims. Produced from 1915 to 1938. Operated by Corinne Kratzer, F. E. and P. W. Judkins, et al. (timeframe = ?). Owned and operated by the Colorado Quartz Gold Mining Co. (1990). The MRDS database stated accuracy for this location is 100 meters.

Mineralization is a fissure vein deposit with a vein 2 to 6 feet (1.83 m) thick, hosted in Late Permian slate and metasedimentary rock. The orebody is a pinch & swell body striking N50W and dipping 70NE at a thickness of 1.83 to/or 2.13 meters. Sandy metasediments have been intruded by greenstone dikes and sills 1–3 feet thick. The vein averages 1.5 to 2 feet (ca. 61 cm) thick and is chiefly banded quartz. The ore shoots are 30 to 75 feet (ca. 23 m) wide and pitch about 45 degrees. The strike and dip of slaty cleavage near the shaft is roughly parallel to the vein and to the bedding planes. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains), and/or Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).

Workings include underground openings, which, in 1915, consisted of a 500-foot adit level, a 140-foot raise to the surface, another 65-foot raise, and a 13-foot winze. Mention is also made of a 200-foot inclined shaft, a 300-foot-long stope, and a 200-foot drift.

Nothing is recorded of early production. About 2,500 tons of ore were mined in the late 1920s, which ran $10 to $11 per ton, with some development rock running $8/ton (period values). Total production probably does not exceed $50,000 (period values).

Other Databases

Link to USGS MRDS:	10031125

Other Regions, Features and Areas containing this locality

References