Colorado · Fremont County
Past Producer

Cotopaxi District

Fremont County, Colorado, United States
ZincCopperLeadGoldSilver
⌖ Show on mapUSGS source ↗
Commodities
PrimaryZinc, Copper
SecondaryLead, Gold, Silver
Commodity typeM
Deposit
Model271: Stratabound Precambrian sulfide, Colorado and Wyoming
Deposit sizeS
Orebody formLENSOID
Ore controlLeucocratic Lenses Within Host Rock
Materials
Ore mineralsChalcopyrite, Gahnite, Galena, Gold, Silver, Sphalerite
GangueBiotite, Garnet, Gypsum, Hornblende, Quartz
Geology
Host rockGneiss,Skarn (Tactite) · Migmatitic Gneiss
Associated rockDiorite · Granodiorite Of Boulder Creek Age
StructureThirtynine Mile Volcanic Field, Wet Mountains, Cotopaxi Fault
Tectonic settingCentral Colorado (Southern Rocky Mountains)
Economic & production
Development statusPast Producer
First production1850
Last production1945
Discovery year1875
Identification
Deposit ID10101797
MRDS IDD009484
RegionNA
Data scoreB
Coordinates38.38195, -105.6953
References
VANDERWILT, J.W., 1947, MINERAL RESOURCES OF COLORADO: COLORADO MINERAL RESOURCES BOARD, P. 83-85.TAYLOR, R.B., SCOTT, G.R., WOBUS, R.A., EPIS, R.C., 1975, RECONNAISSANCE GEOLOGIC MAP OF THE COTOPAXI 15-MINUTE QUADRANGLE, FREMONT AND CUSTER COUNTIES, COLORADO: USGS MAP T-900, 1:62,500.LINDGREN, WALDEMAR, 19078 NOTES ON COPPER DEPOSITS IN CHAFFEE, FREMONT, AND JEFFERSON COUNTIES, COLORADO: USGS BULLETIN 340, P. 157-174.HEINRICH, E.W., 1981, PRECAMBRIAN TUNGSTEN AND COPPER-ZINC SKARN DEPOSITS OF SOUTH-CENTRAL COLORADO: CGS RESOURCE SERIES 21, P. 30, 83-88HARRER, C.M. AND TESCH, W.J., JR., 1959, RECONNAISSANCE OF IRON OCCURRENCES IN COLORADO: USBM IC 7918, 82 P.Sheridan, D.M., and Raymond, W.H., 1984, Precambrian deposits of zinc-copper-lead sulfides and zinc spinel (gahnite) in Colorado: U.S. Geological Survey Bulletin 1550, 31 p.Sheridan, D.M., Raymond, W.H., Taylor, R.B., and Hasler, J.W., 1990, Metallogenic map of stratabound exhalative and related occurrences in Colorado: U.S. Geological Survey Miscellaneous Investigations Series Map I-1971, scale 1:1,000,000.Heimann, Adriana, 2002, The composition of zinc-rich spinels associated with metamorphosed massive sulfide deposits - a reexamination: Society of Economic Geologists Abstracts, 2002 Denver Annual Meeting.VANDERWILT, J.W., 1947, P. 84