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Peterson

Prospect in Alaska, United States with commodities Silver, Gold, Copper, Lead, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10001581
MRDS ID A012335
Record type Site
Current site name Peterson
Alternate or previous names Surprise
Related records 10112740

Geographic coordinates

Geographic coordinates: -131.47566, 55.36474 (WGS84)
Relative position The Peterson prospect is just above sea level on the west shore of George Inlet, about 1.15 miles south of the mouth of Beaver Falls Creek. The site is in section 17, T. 75 S., R. 92 E., of the Copper River Meridian. It corresponds to loc. 80 in Elliott and others (1978), and to loc. 296 in Maas and others (1995). The location is accurate within a few hundred feet. Some early reports apparently refer to this property as the Surprise prospect (Cobb and Elliott, 1980, p. 84).

Site location context

Political divisions (FIPS codes)

Ketchikan Gateway(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ketchikan B-5(quadrangle 1:63,360 scale)

Ketchikan SW(quadrangle 1:100,000 scale)

Ketchikan(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Ketchikan(hydrologic unit)

Southern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Cape Fox Village Corporation(ANCSA Village)

ANCSA Village NTVPIC(Type of land area)

NTVPIC(Federal land areas administered by NTVPIC)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Lead Primary
Zinc Critical Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Pyrrhotite Ore
Sphalerite Ore
Calcite Gangue
Graphite Gangue
Quartz Gangue

Alteration

  • (Local) Pyrite is sparsely disseminated in the schist wallrock adjacent to the vein.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist

Nearby scientific data

(1) KJgn
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks in this part of Revillagigedo Island are marine, pelitic phyllite and schist that are intruded by Cretaceous stocks, sills, and dikes of feldspar-porphyritic granodiorite, and by a stock and probably related plugs of Tertiary gabbro (Berg and others, 1988). The strata and some of the granodiorite were regionally metamorphosed to greenschist grade in Late Cretaceous time. These regionally metamorphosed rocks subsequently were locally contact metamorphosed to hornblende hornfels near the contacts of Cretaceous granodiorite plutons that were emplaced after the regional metamorphism, and then more widely remetamorposed to hornblende hornfels near the contacts of the Tertiary gabbro. The premetamorphic age range of the pelitic strata is uncertain. Berg and others (1988) assign them a Mesozoic or (Late) Paleozoic age; Brew and Ford (1998) and Crawford and others (in press) assign them to the Gravina belt, of Late Jurassic or Cretaceous age.? Wright and Wright (1908, p. 150) described the principal Peterson deposit as a fault-gouge-bounded, sulfide-bearing, quartz-calcite-graphite fissure vein that averages 15 feet wide and has been traced along strike for 1000 feet. The vein strikes NW, parallel to the foliation of pelitic schist host rock, and dips steeply NE to vertical, which intersects the SW dip of the foliation. The sulfide minerals in the vein are pyrite, galena, sphalerite, and pyrrhotite, along with reported values of Au and Ag. Pyrite is also sparsely disseminated in the wallrocks adjacent to the vein.? the Peterson deposit was discovered in 1908 and explored by 3 short adits in 1913. There has been no additional mining-related work since then (Maas and others, 1995, p. 202). In 1995, the patented property was on the site of the George Inlet Lodge. Samples of a shear zone exposed in an adit showed low metal values (Maas and others, 1995, p. 209). A sample of massive pyrrhotite collected from the creek adjacent to this adit contained 6.2 ppm Ag, 1066 ppm Cu, 2469 ppm Zn, and 246 ppm Ni.
  • Age = Probably Late Cretaceous or younger.

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 Peterson deposit was discovered in 1908 and explored by 3 short adits in 1913. There has been no additional mining-related work since then (Maas and others, 1995, p. 202). In 1995, the patented property was on the site of the George Inlet Lodge. Samples of a shear zone exposed in an adit showed low metal values (Maas and others, 1995, p. 209). A sample of massive pyrrhotite collected from the creek adjacent to this adit contained 6.2 ppm Ag, 1066 ppm Cu, 2469 ppm Zn, and 246 ppm Ni.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Wright and Wright, 1908; Maas and others, 1995

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c)

Reporter information

Type Date Name Affiliation Comment
Reporter 03-JUL-1999 H.C. Berg U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.