Six Point

Prospect in Alaska, United States with commodities Gold, Copper

Geologic information

Identification information

Deposit ID 10001572
MRDS ID A012322
Record type Site
Current site name Six Point
Related records 10282808

Geographic coordinates

Geographic coordinates: -131.85067, 55.38085 (WGS84)
Relative position The Six Point prospect is within a few yards of tidewater on the south side of Vallenar Bay, about 1.2 miles east of South Vallenar Point. The site is in section 11, T. 75 S., R. 89 E., of the Copper River Meridian. It corresponds to loc. 53 in Elliott and others (1978). The location is accurate within 0.1 mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Quartz Gangue

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite > Diabase
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -131.85067, 55.38085

Comments on the geologic information

  • Geologic Description = The country rocks in the general area of this prospect are complexly folded and faulted Devonian carbonate and clastic strata; Upper Triassic carbonates, clastics, and basaltic and rhyolitic volcanic rocks; and Upper Jurassic or Lower Cretaceous flysch (Berg, 1973; Berg and others, 1988). At least some of the folding was accompanied by low-grade regional metamorphism, probably in Late Cretaceous time.? the deposit consists of a pinch-and-swell quartz fissure vein up to a few feet thick that contains pyrite and a little chalcopyrite (Brooks, 1902, p. 73-74; Wright and Wright, 1908, p. 140). The vein follows a fault-breccia zone at the contact between an altered mafic(?) dike and Devonian slaty limestone, and apparently formed during or after the Late Cretaceous folding and regional metamorphism. The deposit was prospected for gold in the early 1900s, and explored at that time by a shaft and tunnel of unknown length.
  • Age = Late Cretaceous or younger.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Mining district

District name Ketchikan

Comments on the workings information

  • Workings / Exploration = The deposit was prospected for gold in the early 1900s, and explored at that time by a shaft and tunnel of unknown length.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012322
USGS Alaska Resource Data File ARDF KC056

Bibliographic references

  • Deposit

    Brooks, A.H., 1902, Preliminary report on the Ketchikan mining district, Alaska, with an introductory sketch of the geology of southeastern Alaska: U.S. Geological Survey Professional Paper 1, 120 p.

  • Deposit

    Wright, F.E., and Wright, C.W., 1908, The Ketchikan and Wrangell mining districts, Alaska: U.S. Geological Survey Bulletin 347, 210 p.

  • Deposit

    Berg, H.C., 1973, Geology of Gravina Island Alaska: U.S. Geological Survey Bulletin 1373, 41 p.

  • Deposit

    Elliott, R.L., Berg, H.C., and Karl, Susan, 1978, map and table describing metalliferous and selected nonmetalliferous mineral deposits, Ketchikan and Prince Rupert quadrangles, Alaska: U.S. Geological Survey Open-file Report, 78-73-B,17 p., scale 1:250,000.

  • Deposit

    Berg, H.C., Elliott, R.L., and Koch, R.D., 1988, Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska: U.S. Geological Survey Mineral Investigations Series Map MF-1807,27 p., scale 1:250,000.

Comments on the references

  • Primary Reference = Brooks, 1902; Berg, 1973

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide gold-quartz veins? (Cox and Singer, 1986; model 36a)

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1999 H.C. Berg U.S. Geological Survey