Mine detail: Darby Extension

Location:	Custer County, Colorado, United States, North America
Lat / long:	38.24112, -105.36724
dep_id:	10012567
mrds_id:	D008250
Commodity type:	metallic and nonmetallic
Major mineral:	Thorium, REE
Trace mineral:	Barium-Barite, Copper, Lead
Operation type:	Unknown
Production size:	No production occurred
Development status:	Past Producer
ore:	Barite, Chalcopyrite, Galena, Thorite
gangue:	Calcite, Limonite, Pyrite, Quartz, Siderite
work_type:	Surface/Underground
model:	30: Thorium-rare-earth veins
ore_ctrl:	Mineralized Veins, Shear Zone; Nw-Trending Fault Zone
Reporter:	Collins, Donna B.
hrock_unit:	Hornblende Gneiss
hrock_type:	Gneiss,Granite
Structure:	Wet Mountains, Large, Northwest-Trending Dead Mule Gulch Fault; Smaller, Northeast-Trending Fault
tectonic:	Central Cordillera (Southern Rocky Mtns)
References:	Deposit:: NELSON-MOORE, J.L., COLLINS, D.B., AND HORNBAKER, A.L., 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: COLORADO GEOLOGICAL SURVEY BULLETIN 40, P.120 Deposit:: BROCK, M.R. AND SINGEWALD, Q.D., 1968, GEOLOGIC MAP OF THE MOUNT TYNDALL QUADRANGE, CUSTER COUNTY, COLORADO: USGS MAP GQ-596. Deposit:: CHRISTMAN, R.A., HEYMAN, A.M., DELLWIG, L.F., AND GOTT, G.B., 1953, THORIUM INVESTIGATIONS 1950-52, WET MOUNTAINS, COLORADO: USGS CIRCULAR 290, P. 24-25. Deposit:: CHRISTMAN, R.A., BROCK, M.R., PEARSON, R.C., AND SINGEWALD, Q.D., 1959, GEOLOGY AND THORIUM DEPOSITS OF THE WET MOUNTAINS, COLORADO, A PROGRESS REPORT: USGS BULLETIN 1072-H, P.522-524.