Description
I. B. Humphrey
Commodities
PrimaryGold, Silver
Commodity typeM
Deposit
Deposit typePlacer
Deposit sizeS
WorkingsSurface
Orebody formLENTICULAR, IRREGULAR
Ore controlCoarse Gravel In Meanders At Fault-Weakened Widenings In Stream Valley
Materials
Ore mineralsGold, Silver
GangueGarnet, Magnetite, Pyrite
Geology
Host rockSand and Gravel · Post-Piney Creek Alluvium;Piney Creek Alluvium
StructureFront Range Uplift, Denver Basin, Blackhawk Fault, Floyd Hill Fault Zone
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
AlterationOxidized Au-Bearing Sulfides From Upstream Lode Mining And Milling Wastes
Economic & production
Development statusPast Producer
First production1932
Last production1936
Identification
Deposit ID10013746
MRDS IDD010205
RegionNA
Data scoreB
Coordinates39.7461, -105.43642
References
PARKER, B.H., JR., 1974, GOLD PLACERS OF COLORADO: COLORADO SCHOOL OF MINES QUART., V. 69, NO. 3, P. 66, 98, 115-126.SHERIDAN, D.M., AND OTHERS, 1972, GEOLOGIC MAP OF THE EVERGREEN QUADRANGLE, JEFFERSON COUNTY, COLORADO: USGS MAP I-786-A.SHERIDAN, D.M., AND MARSH, S.P., 1976, GEOLOGIC MAP OF THE SQUAW PASS QUADRANGLE, CLEAR CREEK, JEFFERSON, AND GILPIN COUNTIES, COLORADO: USGS MAP GQ-1337.FORBES, R.H., 1933, THE HUMPHREYS GOLD CORPORATION DREDGING OPERATIONS ON CLEAR CREEK: MINES MAG., V. 23, NO. 5, P. 9-10.GARDNER, E.D., AND GUITERAS, J.R., 1937, PLACER OPERATIONS OF HUMPHREYS GOLD CORPORATION, CLEAR CREEK, COLORADO; USBM IC-6961, 16 P.GARDNER AND GUITERAS (1937)