Derwent

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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

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.)

The Top Ten Gold Producing States

These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.