Unnamed (on Ham Island)

Occurrence in Alaska, United States with commodity Gold

Geologic information

Identification information

Deposit ID 10001618
MRDS ID A012382
Record type Site
Current site name Unnamed (on Ham Island)

Geographic coordinates

Geographic coordinates: -131.36981, 55.18085 (WGS84)
Relative position This site consists of three occurrences on the southwest shore of Ham Island, about midway in Cascade Inlet. The 0.2-mile-long strip of shoreline that contains the occurrences is in sections 22 and 23, T. 77 S., R. 93 E., of the Copper River Meridian. The site corresponds to loc. 10 in Berg (1972 [I 684]), loc. 139 in Elliott and others (1978), and loc. 25a-c in Karl (1992). The location is accurate within 0.1 mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold 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
Model code 119
USGS model code 39a
BC deposit profile C01. C02
Deposit model name Placer Au-PGE
Mark3 model number 54

Nearby scientific data

(1) -131.36981, 55.18085

Comments on the geologic information

  • Geologic Description = The country rocks at this site are Jurassic and Cretaceous flyschlike metasedimentary rocks that grade upward into andesitic or basaltic metavolcanic rocks (Berg, 1972). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. ? the occurrences consist of traces of gold in quartz fissure veins that cut the metasedimentary rocks, and traces of gold in a small beach placer. A pan concentrate of beach gravel contained 0.05 ppm Au, 500 ppm Cu, and 200 ppm Pb; and samples of pyritic tuff and a quartz-pyrite vein respectively contained 0.7 ppm Ag and 0.05 ppm Au (Karl, 1992, loc. 25a-c).
  • Age = Fissure veins are Cretaceous or younger; placer is Holocene.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Mining district

District name Ketchikan

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012382
USGS Alaska Resource Data File ARDF KC142

Bibliographic references

  • Deposit

    Berg, H.C., 1972, Geologic map of Annette Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-684, 8 p., 1 sheet, scale 1:63,360,

  • 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

    Karl, S.M., 1992, Map and table of mineral deposits on Annette Island, Alaska: U.S. Geological Survey Open-File Report 92-690, 57 p., 1 map, scale 1:63,360.

Comments on the references

  • Primary Reference = Karl, 1992

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide Au-quartz veins; Placer Au-PGE (Cox and Singer, 1986; models 36a, 39a)
Deposit Model Number = 36a, 39a

Reporter information

Type Date Name Affiliation Comment
Reporter 06-JUL-1999 H.C. Berg U.S. Geological Survey