Description
Fred Schwartzwalder
Commodities
PrimaryUranium
TertiaryIron, Molybdenum, Silver, Zinc, Bismuth, Nickel, Copper, Lead
Commodity typeM
Materials
Ore mineralsBornite, Chalcocite, Covellite, Molybdenite, Niccolite, Pyrite, Silver, Sphalerite, Uraninite, Pitchblende
GangueAnkerite, Calcite, Chlorite, Quartz
Geology
Host rockGneiss,Amphibolite,Granite · Idaho Springs Formation-Hornblende Gneiss Unit
Associated rockPegmatite · Granitic Pegmatite
StructureFront Range Uplift, Denver Basin, Rogers Fault Zone
Tectonic settingCentral Cordillera (Southern Rocky Mts.)
AlterationBreccia Fragments Are Highly Altered With Potassium Alteration Being Prominent
Economic & production
Development statusPast Producer
First production1956
Last production1962
Discovery year1949
Identification
Deposit ID10013716
MRDS IDD010159
Alternate namesHoffmeister Homestead Prospect, Black Judge Shaft, Nigger Shaft
RegionNA
Data scoreB
Coordinates39.85374, -105.30208
References
NELSON-MOORE, J.L., COLLINS, D.B., AND HORNBAKER, A.L., 1978, RADIOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: COLORADO GEOLOGICAL SURVEY BULL. 40, P. 193SHERIDAN, DOUGLAS M. AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520, p. 87-91.ADAMS, J.W., AND OTHERS, 1953, URANIUM OCCURRENCES IN THE GOLDEN GATE CANYON AND RALSTON CREEK AREAS, JEFFERSON COUNTY, COLORADO: USGS CIRC. 320, P. 13, 15-16.SIMS, P.K., AND SHERIDAN, D.M., 1964, GEOLOGY OF URANIUM DEPOSITS IN THE FRONT RANGE, COLORADO: USGS BULL. 1159, P. 93-94SHERIDAN AND OTHERS, 1967, P. 75; COLORADO DIV. MINES ANN. OPERATORS REPTS.