The Unnamed (west of upper Illinois Creek) is a silver and zinc 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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Unnamed (west of upper Illinois Creek) MRDS details
Site Name
Primary: Unnamed (west of upper Illinois Creek)
Commodity
Primary: Silver
Primary: Zinc
Secondary: Gold
Location
State: Alaska
District: Kaiyuh
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
Not available
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Sulfides are oxidized to limonite, and, locally, to malachite (Flanigan, 1998).
Rocks
Role: Associated
Age Type: Associated Rock
Age in Years: 112.000000+-
Dating Method: Ar-Ar
Age Young: Early Cretaceous
Role: Associated
Age Type: Associated Rock
Age in Years: 108.000000+-
Dating Method: K-Ar
Age Young: Early Cretaceous
Analytical Data
Not available
Materials
Ore: Pyrite
Ore: Malachite
Gangue: Limonite
Comments
Comment (Geology): Age = Chronological age is for the nearby Khotol pluton.
Comment (Exploration): Status = Probably inactive
Comment (Geology): Age = the nearby Khotol pluton has been dated by K-Ar and Ar/Ar methods at 108-112 Ma (Flanigan, 1998). Flanigan links these occurrences to magmatic fluids from that pluton.
Comment (Reference): Primary Reference = Flanigan, 1998
Comment (Workings): Workings / Exploration = These occurrences were discovered by Anaconda Minerals Company in 1980; geologic mapping and sampling followed (Flanigan, 1998).
Comment (Geology): Geologic Description = Madelyn's gossan consists of sparse, limonitic, quartzite float. Samples contain 10-20% banded limonite after pyrite. Analyses of four rock samples show only slightly anomalous values, including up to 226 ppm zinc, 2.3 ppm silver, and 30 ppb gold (Flanigan, 1998). Nate's gossan is a small outcrop (10 by 50 meters) of limonitic, brecciated quartzite. The limonite replaces banded and veined sulfides (pyrite?). Traces of malachite occur in nearby graphitic schist. Four rock samples contained up to 80 ppm copper, 308 ppm zinc, 1.0 ppm silver, and 25 ppb gold (Flanigan, 1998).
References
Reference (Deposit): Flanigan, B., 1998, Genesis and mineralization of ore deposits in the Illinois Creek region, West Central Alaska: University of Alaska, Fairbanks, M.Sc. thesis, 125 p., 2 plates.
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