Lucrata

The Lucrata is a silver and gold 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: Lucrata
Secondary: Lucrative Group

Commodity

Primary: Silver
Primary: Gold
Secondary: Copper

Location

State: Alaska
District: Valdez Creek

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: Quartz-sericite-pyrite alteration.

Rocks

Name: Gabbro
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Arsenopyrite
Gangue: Quartz

Comments

Comment (Reference): Primary Reference = Ross, 1933

Comment (Geology): Geologic Description = The general area of this prospect is characterized by thick Quaternary glacial deposits and Upper Tertiary sedimentary strata that mostly cover Upper Jurassic to Upper Triassic(?) crystal tuff, argillite, chert, graywacke, and limestone (Wilson and others, 1998). Upper Cretaceous quartz diorite dikes cut the mesozoic bedded rocks, mainly along the nearby Chulitna fault. At the Lucrata prospect, arsenopyrite-chalcopyrite pods up to 4 feet thick and 5 feet long area in a quartz stockwork in gabbro and basalt along the Chulitna fault zone. Assay values as high as 1.26 ounces of gold per ton and 3.8 ounces of silver per ton are reported by Hawley and Clark (1974); average grades of 0.49 ounce of gold per ton and 1.03 ounces of silver per ton are reported by Bundtzen (1983).

Comment (Deposit): Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c)

Comment (Workings): Workings / Exploration = There has been both surface and underground exploration; a 15 ft tunnel was driven in 1920. Assay values as high as 1.26 ounces of gold per ton and 3.8 ounces of silver per ton are reported by Hawley and Clark (1974); average grades of 0.49 ounce of gold per ton and 1.03 ounces of silver per ton are reported by Bundtzen (1983).

Comment (Geology): Age = Late Cretaceous or younger, assuming that the deposit is related to the intrusion of the quartz diorite.

Comment (Exploration): Status = Active

Comment (Deposit): Other Comments = the Lucrata prospect has also been referred to as the Dunkle mine. This should be dropped as it invites comparison to the Dunkle coal mine, a separate deposit.

References

Reference (Deposit): Capps, S.R., 1919, Mineral resources of the upper Chulitna region: U.S. Geological Survey Bulletin 692-D, p. 207-232.

Reference (Deposit): Balen, M.D., 1990, Geochemical sampling results from the Bureau of Mines Investigations in the Valdez Creek mining district, Alaska: U.S. Bureau of Mines Open-File Report 34-90, 218 p., 2 plates, scale 1:250,000.

Reference (Deposit): Hawley, C.C., and Clark, A.L., 1974, Geology and mineral deposits of the upper Chulitna district, Alaska: U.S. Geological Survey Professional Paper 758-B, p. 1-47, 2 sheets, scale 1:12,000 and 1:48,000.

Reference (Deposit): Hawley, C.C., and Clark, A.L., 1968, Occurence of gold and other metals in the upper Chulitna district, Alaska: U.S. Geological Survey Circular 564, 21 p.

Reference (Deposit): Berg, H.C., and Cobb, E.H., 1967, Metalliferous Lode Deposits of Alaska. U.S. Geological Survey Bulletin 1246, 254 p.

Reference (Deposit): Ross, C.P., 1933, The Valdez Creek mining district, Alaska: U.S. Geological Survey Bulletin 849, p. 289-467.

Reference (Deposit): Townsend, H.H., 1925, Assay returns: Alaska Territorial Dept. of Mines Itinerary Report 195-48, 4 p.

Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-1062, 113 p.

Reference (Deposit): Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 17 p., 2 sheetsm, scale 1:500,000.

Reference (Deposit): Bundtzen, T.K., 1983, Mineral resource modeling, Kantishna and Dunkle mine study areas: Alaska Division of Geological "&" Geophysical Surveys Report of Investigations 83-12, 51 p.

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