Casca Zinc

The Casca Zinc is a lead 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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Site Name

Primary: Casca Zinc

Commodity

Primary: Lead
Primary: Zinc
Secondary: Barium-Barite

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: Iron oxide, sulfides, and silicification occur mainly along fault and fracture zones (DiMarchi and others, 1993).

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Hematite
Ore: Galena
Ore: Barite

Comments

Comment (Geology): Age = Early Cambrian or younger, based on the age of the host rocks.

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

Comment (Exploration): Status = Active

Comment (Deposit): Model Name = Carbonate-hosted Zn-Pb; Appalachian Zn (Schmidt, 1997; Cox and Singer, 1986; model 32b)

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 = The mineralization at Casca Zinc prospect is hosted by limestone of the Lower Cambrian Funnel Creek Formation (Brabb and Churkin, 1969). The deposits consists of fracture and open-space fillings that locally contain specular hematite, barite, and sphalerite. The sphalerite is typically massive, very fine grained, and compact, but is also found disseminated throughout the limestone (DiMarchi and others, 1993). Alteration consists mainly of silicification of fossiliferous limestone, but iron oxides and specular hematite can be locally abundant. Most of the iron oxide, alteration, and sulfide mineralization is confined to fault and fracture zones. Soil sampling programs starting in the mid-1970s have outlined areas of anomalous zinc and lead. Rock samples from Casca Zinc prospect yield as much as 18.9 percent Zn (DiMarchi and others, 1993).

Comment (Workings): Workings / Exploration = Several soil and rock sampling programs have been carried out on the property, beginning in the mid-1970s. In 1993, a detailed mapping program was completed by ASA Inc. This property lies on Doyon, Limited selected or conveyed land.

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): 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): Brabb, E.E., and Churkin, M.J., 1969, Geologic map of the Charley River quadrangle, east-central Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-573, 1 sheet, scale 1:250,000.

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