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.
Location: The Casca Zinc prospect is at about 2,600 feet elevation, approximately 1/3 mile southwest of Tindir Creek, in the NE1/4 section 26, T. 6 N., R. 32 E., of the Fairbanks Meridian. This prospect is on land selected by or conveyed to Doyon, Limited. The location is accurate.
Geology: 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).
Workings: 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.
Age: Early Cambrian or younger, based on the age of the host rocks.
Alteration: Iron oxide, sulfides, and silicification occur mainly along fault and fracture zones (DiMarchi and others, 1993).

Commodities (Major) - Pb, Zn; (Minor) - Ba
Development Status: None
Deposit Model: Carbonate-hosted Zn-Pb; Appalachian Zn (Schmidt, 1997; Cox and Singer, 1986; m

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

ⓘ Barite (Barytes)

ⓘ Lead

Mineral List

4 valid minerals.

Detailed Mineral List:

ⓘ Baryte

Formula: BaSO₄

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

ⓘ Galena

Formula: PbS

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

ⓘ Hematite

Formula: Fe₂O₃

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

ⓘ Sphalerite

Formula: ZnS

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Sphalerite	2.CB.05a	ZnS
ⓘ	Galena	2.CD.10	PbS
Group 4 - Oxides and Hydroxides
ⓘ	Hematite	4.CB.05	Fe₂O₃
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Baryte	7.AD.35	BaSO₄

List of minerals for each chemical element

O	Oxygen
O	ⓘ Baryte	BaSO₄
O	ⓘ Hematite	Fe₂O₃
S	Sulfur
S	ⓘ Baryte	BaSO₄
S	ⓘ Galena	PbS
S	ⓘ Sphalerite	ZnS
Fe	Iron
Fe	ⓘ Hematite	Fe₂O₃
Zn	Zinc
Zn	ⓘ Sphalerite	ZnS
Ba	Barium
Ba	ⓘ Baryte	BaSO₄
Pb	Lead
Pb	ⓘ Galena	PbS

Other Databases

Link to USGS - Alaska:	CY005

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America PlateTectonic Plate

Brooks-Northslope1 DomainDomain
Cordillera Front and ThrustOrogenic Belt
Laurentia triangle DomainDomain

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

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. 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, Limited, Fairbanks, Alaska.) 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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