Pleasant Creek

The Pleasant Creek is a zinc 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: Pleasant Creek

Commodity

Primary: Zinc
Primary: Lead
Secondary: Copper
Secondary: Cobalt
Secondary: Arsenic
Secondary: Silver
Secondary: Antimony

Location

State: Alaska
District: Black

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: Mississippi Valley, Appalachian Zn

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: The alteration at the Pleasant Creek prospects includes serpentization, silicification, and quartz veining.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Pyrite
Ore: Galena
Gangue: Serpentine
Gangue: Quartz

Comments

Comment (Exploration): Status = Active

Comment (Reference): Primary Reference = DiMarchi and others, 1993

Comment (Deposit): Other Comments = This property lies on Doyon, Limited selected or conveyed land. For more information, contact Doyon, Limited. This site is within the Yukon-Charley Rivers National Preserve.

Comment (Geology): Geologic Description = Rock units in the prospect area are of Late Precambrian age and include a thick unit of basalt and redbeds with an interlayered sequence of massive carbonate rocks and conglomerate (DiMarchi and others, 1993). Carbonate rocks include the Pack Formation, a massive dolomite that lies unconformably over the Pleasant Creek Formation of dolomitic limestone, quartzite, and shale. Numerous facies changes and iron-rich zones characterize the prospect area. All of the units are folded along a northeast-trending anticlinal structure which is probably sympathetic to the larger scale Cathedral Creek arch. The prospect area also contains numerous northeast-trending thrust faults and two major high-angle faults, having displacements of 700 to 1,500 feet. A northeast-trending andesite dike swarm cuts across all of the map units in the area (DiMarchi and others, 1993). The prospect hosts two types of breccia: (1) areally extensive collapse breccias related to karsting in the carbonate units; and (2) an areally limited breccia related to faulting along the margins of the andesite dikes. Small iron oxide gossans along the breccias may increase with depth. Silicification and quartz veining are common in both breccia types, and serpentine is found rarely in fractures in the dolomite (DiMarchi and others, 1993). Mineralization at Pleasant Creek consists of a breccia body of unrotated dolomite fragments coated with pyrite in an open-space-fill matrix of coarse dolomite and massive pyrite; very fine grained, light colored sphalerite infilling brecciated pyrite; and late galena cubes (Andres and others, 1977). Soil sampling, rock sampling, and geologic mapping programs have been conducted at the Pleasant Creek prospects (DiMarchi and others, 1993).

Comment (Workings): Workings / Exploration = Soil sampling, rock sampling, and geologic mapping programs have been conducted at the Pleasant Creek prospects (DiMarchi and others, 1993).

Comment (Deposit): Model Name = Plutonic-related Pb-Zn?, Carbonate-hosted Zn? (Cox and Singer, 1986; model 32b)

References

Reference (Deposit): DiMarchi, J.J., Weglarz, T.B., Adams, D.D., Hubert, J.A., and West, A.W., 1993, 1993 annual report reconnaissance program, Doyon option lands: ASA Inc., 120 p. (Report held by Doyon Ltd., Fairbanks, Alaska.)

Reference (Deposit): Andrews, Tom, Bigelow, C.G., Fernette, J.P., Jirik, R., Kretschmar, U., Kretschmar, D., Lessman, J., McOuat, M., Martin, W., Ruzicka, J., Sandrock, G., Skyllingstad, P., Yinger, M., 1977, 1976 Annual progress report, Doyon project volume 1a, blocks 1, 4, 5, 7, 8: Anchorage, Alaska, WGM, Inc., p. 7-1 to 7-23. (Report held by Doyon, Limited, Fairbanks, Alaska.)

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.

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