Unnamed (near headwaters of Dillon Creek)

The Unnamed (near headwaters of Dillon Creek) is a copper, gold, silver, and lead 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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Site Name

Primary: Unnamed (near headwaters of Dillon Creek)

Commodity

Primary: Copper
Primary: Gold
Primary: Silver
Primary: Lead

Location

State: Alaska
District: Council

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Oxidation of vein sulfides has occurred.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Chrysocolla
Ore: Galena
Ore: Malachite
Gangue: Limonite
Gangue: Quartz

Comments

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Gamble, 1988

Comment (Workings): Workings / Exploration = A shallow, 16 foot-long prospect trench trending N 55 W has been dug here.

Comment (Geology): Geologic Description = Chalcopyrite, galena, pyrite (?), and duftite (?) are intergrown with drusy comb-quartz in fissure veins along a 30 foot-wide fault zone in high grade metamorphic rocks here (Briskey, 1983). The vein is oxidized and secondary minerals include limonite, malachite, and chrysocolla. A grab sample contained 0.5 ppm Au, 8 % As, 6,000 ppm Zn, 680 ppm Sb, 300 ppm Ag, 1.5 % Cu, greater than 2 % Pb, and 30 ppm Mo (Gamble, 1988). This occurrence, and several others in this part of the Bendeleben A-4 quadrangle, are in high grade metamorphic rocks that are structurally above or peripheral to the crosscutting Pargon pluton. The Pargon pluton is mostly granodiorite and assumed to be Cretaceous in age (Till and others, 1986). It was emplaced at shallower depths than the more deep-seated Bendeleben pluton to the east. The metamorphic rocks peripheral to the western Pargon pluton are also intruded by small, felsic dikes and plugs including quartz porphyry and muscovite granite.

Comment (Deposit): Model Name = Polymetallic vein in high grade metamorphic rocks (Cox and Singer, 1986; model 22c ?)

Comment (Geology): Age = Cretaceous; this occurrence is probably related to emplacement of the Pargon pluton which is assumed to be Cretaceous in age.

References

Reference (Deposit): Till, A.B., Dumoulin, J.A., Gamble, B. ., Kaufman, D.S., and Carroll, P.I., 1986, Preliminary geologic map and fossil data, Soloman, Bendeleben, and southern Kotzebue quadrangles, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 86-276, 10 p., 3 plates, scale 1:250,000.

Reference (Deposit): Gamble, B.M., 1988, Non-placer mineral occurrences in the Solomon, Bendeleben, and southern part of the Kotzebue quadrangles, western Alaska: U.S. Geological Survey Map MF-1838-B, 13 p., 1 sheet, scale 1:250,000.

Reference (Deposit): Briskey, J.A., 1983, Summary of field observations on Seward Peninsula mineral deposits: U.S. Geological Survey, unpublished administrative report, 34 p.

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