The Derwent is a 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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Derwent MRDS details
Site Name
Primary: Derwent
Commodity
Primary: Zinc
Secondary: Vanadium
Secondary: Silver
Secondary: Molybdenum
Secondary: Uranium
Location
State: Alaska
District: Eagle
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: Sedimentary exhalative Zn-Pb
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Malachite
Ore: Chalcopyrite
Ore: Azurite
Comments
Comment (Exploration): Status = Active
Comment (Geology): Geologic Description = The Derwent zone of zinc geochemical anomalies is hosted by a northwest-trending belt of metasedimentary and possibly metavolcanic rocks. This belt lies between a granitic batholith and the Tintina fault (Doyon, Limited, 1998). The zone extends for 24 miles between the Seventymile and Charley Rivers. It is mostly underlain by Paleozoic phyllite, graphitic schist, chert, phyllite, and marble (Doyon, Limited, 1998). . The zone has been defined by soil samples containing zinc values greater than 5,200 ppm zinc. Some samples, especially ones from a color anomaly, are also weakly anomalous in copper, silver, molybdenum, vanadium, tungsten, and uranium. Soils contain greater than 5,200 parts per million Zn, 3.4 parts per million Ag, 3,000 parts per million V, 18 parts per million U, and 285 parts per million Mo. All of the soil anomalies are probably due to elevated background concentrations in the metasedimentary rocks. Locally, the zone contains quartz veins and segregations that carry visible copper sulfides and oxides. Also, samples of graphitic schist breccia contain 920 parts per million Zn, 900 parts per million V, 85 parts per million Mo, 7 parts per million U, and 1.2 parts per million Ag (Doyon, Limited, 1986). The Derwent zone may be a fault-offset block from near the Anvil district that has been displaced 300 miles by the Tintina fault (Doyon, Limited, 1998). This area has been examined by stream silt samples, panned concentrates, soil and rock sampling of the color anomalies, and regional reconnaissance since the mid-1970s (Doyon, Limited, 1998).
Comment (Deposit): Other Comments = These prospects are located on Doyon, Limited selected or conveyed land. For more information, contact Doyon, Limited.
Comment (Workings): Workings / Exploration = Since the mid-1970s, this area has been examined by stream silt samples, panned concentrates, soil and rock sampling of the color anomalies, and regional geologic reconnaissance (Doyon, Limited, 1998).
Comment (Geology): Age = Paleozoic
Comment (Reference): Primary Reference = Doyon, Limited, 1998
Comment (Deposit): Model Name = Shale-hosted Zn-Pb (Schmidt, 1997; Cox and Singer, 1986; model 31a).
References
Reference (Deposit): Schmidt, J.M., 1997, Shale-hosted Zn-Pb-Ag and barite deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska, 1997: Economic Geology Monograph 9, p. 35-65.
Reference (Deposit): Doyon, Limited, 1998, Veta Prospects 1997 Volume 1: Fairbanks, Alaska, Doyon, Limited., unpublished report 98-10, 256 p. (Report held by Doyon, Limited, Fairbanks, Alaska.)
Reference (Deposit): Doyon, Limited, 1986, Mines, prospects, and geochemical anomalies on Doyon, Limited, regional overselection lands, Alaska: Fairbanks, Alaska, Doyon, Limited, Report 86-01A, v. 1, 150 p. (Report held by Doyon, Limited, Fairbanks, Alaska.)
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