The Colorado Gossan is a gold mine located in Alaska.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
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Colorado Gossan MRDS details
Site Name
Primary: Colorado Gossan
Commodity
Primary: Gold
Secondary: Antimony
Secondary: Arsenic
Secondary: Mercury
Location
State: Alaska
District: Innoko
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Polymetallic replacement
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Extensive oxidation of original sulfide mineralization.
Rocks
Role: Associated
Age Type: Associated Rock
Age in Years: 71.000000+-
Age Young: Late Cretaceous
Analytical Data
Not available
Materials
Ore: Arsenopyrite
Gangue: Tourmaline
Comments
Comment (Geology): Age = the Colorado Gossan prospect is inferred to be Late Cretaceous based on 71.0 Ma age of adjacent plutonic rocks (Moll and others, 1981).
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Chronological age is for adjacent plutonic rocks.
Comment (Reference): Primary Reference = Bundtzen and others, 1997
Comment (Workings): Workings / Exploration = No previous surface working were detected in 1996. Three large, continuous, chip-channel samples taken across 700 feet (213 m) of the long axis of the zone averaged 1,815 ppm arsenic, 80 ppb gold, 3,540 ppb mercury, and 154 ppm antimony (Bundtzen and others, 1997).
Comment (Deposit): Model Name = Polymetallic replacement deposit (Cox and Singer, 1986; model no. 19a)
Comment (Geology): Geologic Description = The Colorado Gossan is a rectangular shaped, 1,500 feet by 950 feet (457 m by 290 m) zone of iron rich ferricrete-tourmaline flooding in hornfels adjacent to the Cripple Creek Mountains pluton. Most of the zone is rubble crop with only a few outcrops observed. Disseminated arsenopyrite grains were seen in selected hand specimens but most samples are extensively oxidized. The gossan area is approximately 2,500 feet (762 m) away from the contact between the hornfels and plutonic phases of the Cripple Creek Mountains stock. The Colorado Gossan prospect is inferred to be Late Cretaceous based on 71.0 Ma age of adjacent plutonic rocks (Moll and others, 1981). Three large, continuous, chip-channel samples taken across 700 feet (213 m) of the long axis of the zone averaged 1,815 ppm arsenic, 80 ppb gold, 3,540 ppb mercury, and 154 ppm antimony (Bundtzen and others, 1997).
Comment (Deposit): Other Comments = Similar morphological features at Won-North prospect (MD021) and Win prospect (MD060).
Comment (Commodity): Gangue = Ferricrete
References
Reference (Deposit): Patton, W.W., Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-A, 1 sheet, scale l:250,000.
Reference (Deposit): Mertie, J.B., Jr., 1936, Mineral deposits of the Ruby-Kuskokwim region, Alaska: U.S. Geological Survey Bulletin 864-C, 115-245.
Reference (Deposit): Bundtzen, T.K., Pinney, D.S., and Laird, G.M., 1997, Preliminary geologic map and descriptive data tables from the Ophir C-1 and western Medfra C-6 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File Report 97-46, 10 p., 1 sheet, scale 1:63,360.
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