Commodities
PrimaryUranium
SecondaryCopper, Molybdenum
TertiaryZinc, Lead, Silver, Gold, Bismuth, Manganese, Nickel, Cobalt
Commodity typeM
Deposit
Deposit sizeM
Orebody formLENTICULAR, LINEAR, IRREGULAR
Ore controlIntersections Of Nw-Trending Laramide Breccia Reefs And Favorable Gneisses
Materials
Ore mineralsBismuth, Bornite, Chalcanthite, Chalcocite, Coffinite, Covellite, Galena, Jordisite, Marcasite, Molybdenite, Niccolite, Pyrite, Pyrrhotite, Silver, Sphalerite, Uranophane
GangueAnkerite, Barite, Calcite, Chlorite, Fluorite, Hematite, Limonite, Quartz, Sericite
Geology
Host rockGneiss,Pegmatite · Idaho Springs Formation-Hornblende Gneiss Unit;Idaho Springs Formation-Microcline-Quartz-Plagioclase-Biotite Gneiss
Associated rockHornblendite,Pegmatite · Granitic Pegmatite;Hornblende Diorite And Hornblendite
StructureFront Range Uplift, Denver Basin, Idaho Springs-Ralston Shear Zone, Rogers, Hurricane Hill, Junction Ranch, And Livingston Fault Systems (Breccia Reefs)
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
AlterationAlteration Of Fe And Cu Minerals And U Ore; Potassic Alteration; Some Silicification
Economic & production
Development statusProducer
First production1895
Discovery year1884
Identification
Deposit ID10087816
MRDS IDD010161
RegionNA
Data scoreB
Coordinates39.84443, -105.28141
References
ADAMS, J.W., AND OTHERS, 1953, URANIUM OCCURRENCES IN THE GOLDEN GATE CANYON AND RALSTON CREEK AREAS, JEFFERSON COUNTY, COLORADO: USGS CIRC. 320.ADAMS, J.W., AND STUGARD, FREDERICK, JR., 1956, WALL-ROCK CONTROL OF CERTAIN PITHBLENDE DEPOSITS IN GOLDEN GATE CANYON, JEFFERSON COUNTY, COLORADO: USGS BULL. 1030-G.NELSON-MOORE, J.L., AND OTHERS, 1978, RAIDOACTIVE MINERAL OCCURRENCES OF COLORADO AND BIBLIOGRAPHY: CGS BULL. 40, P. 189-196.SHERIDAN, D.M., AND OTHERS, 1967, GEOLOGY AND URANIUM DEPOSITS OF THE RALSTON BUTTES DISTRICT, JEFFERSON COUNTY, COLORADO: USGS PROF. PAPER 520 (INCLUDES QUAD GEOLOGIC MAP OF RALSTON BUTTES QUAD).SIMS, P.K., AND SHERIDAN, D.M., 1964, GEOLOGY OF URANIUM DEPOSITS IN THE FRONT RANGE, COLORADO: USGS BULL. 1159.SHERIDAN AND OTHERS, 1967, P. 75; COLORADO DIV. MINES ANN. OPERATORS REPTS.