Naginak Cove

The Naginak Cove is a silver, molybdenum, copper, 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: Naginak Cove

Commodity

Primary: Silver
Primary: Molybdenum
Primary: Copper
Primary: Gold
Secondary: Zinc

Location

State: Alaska
District: Aleutians

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Model Name: Epithermal vein, generic
Model Name: Porphyry Cu

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Quartz-sericite-pyrite and weak propylitic (pyrite-chlorite +/- epidote) alteration around quartz veins. Leaching is slight to moderate.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Pyrite
Gangue: Chlorite

Comments

Comment (Geology): Geologic Description = This site corresponds to two color anomalies as reported by Christie (1974). The first color anomaly is 4,000 ft (1,200 m) by 2,000 ft (600 m) in size and located on a gossan that occurs along the contact between granodiorite of the Shaler batholith and hornfelsed volcanic rocks of the Unalaska Formation (see Drewes and others, 1961). Christie (1974) reported that alaskite and granodiorite (including some aplite) dikes associated with the Shaler batholith are common; five or six 10 ft to 30 ft (3 to 9 m) wide dikes of which were mapped within this anomaly area. A stockwork of intense pyrite veining occurs in the vicinity of the dikes as do some quartz veins having sericite-pyrite envelopes occur. A feldspar porphyry dike(?) is reported as showing weak propylitic alteration. Only copper (mineral) seen was in a single piece of float in creek, it had chalcopyrite as fracture filling and pyrite-chalcopyrite as disseminations in the adjacent wall rock.?In a second area to the south of the above color anomaly, a triangular color anomaly 3,000 ft (900 m) north-south by 1,500 ft (450 m) east-west shows a clear relationship between a sulfide system and a quartz-eye porphyry dike. The color anomaly is cut off on the east by the sea, where it is widest and most intense. The dike narrows is divided into a number of narrow stringers in the west and widens to the east where it may grade into a feldspar (+/- quartz-eyes) porphyry. Alteration are most intense and sulfides are most common where the dike is widest on east. Pyrite occurs within the dike and the immediately adjacent wall rock as veins having envelopes of quartz sericite alteration. Chalcopyrite, pyrite, and chlorite occur in veins and disseminations less than 50 ft (15 m) from the dike contact. Christie (1974 mentions a mineralized zone 200 ft by 800 ft (61 m by 244 m) in maximum size and that most of the rock in this zone contains no chalcopyrite. It is not clear what the relationship of this mineralized zone has to other parts of the described color anomaly.?Fracturing is moderately intense in both areas.

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = Reconnaissance geologic mapping and limited soil sampling. Two samples reported by Christie (1974) had 7 and 16 ppm molybdenum, 146 and 175 ppm copper, 84 and 290 ppm zinc, 1.8 and 2.1 ppm silver, and 0.03 and 0.05 ppm gold. In the southern part of the area, samples had concentrations ranging up to 16 ppm molybdenum, 510 ppm copper, 680 ppm zinc, 2.0 ppm silver, and 0.03 ppm gold.

Comment (Reference): Primary Reference = Christie, 1974

Comment (Deposit): Model Number = 17, 25

Comment (Deposit): Other Comments = the analytical data from very limited sampling indicate further of evaluation of this area for epithermal gold veins is probably warranted.

Comment (Deposit): Model Name = Copper porphyry, epithermal gold vein

Comment (Geology): Age = Miocene or younger

References

Reference (Deposit): Drewes, Harold, Fraser, G.D., Snyder, G.L., and Barnett, H.F., Jr., 1961, Geology of Unalaska Island and adjacent insular shelf, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-S, p. 583-676.

Reference (Deposit): Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)

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