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  3. Mineral Resource Data System (MRDS)

Unnamed (shoreline of Sylburn Harbor)

Occurrence in Alaska, United States with commodities Silver, Gold, Lead
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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 10001611
MRDS ID A012375
Record type Site
Current site name Unnamed (shoreline of Sylburn Harbor)

Geographic coordinates

Geographic coordinates: -131.58787, 55.20085 (WGS84)
Relative position This occurrence is on the shoreline of outer Sylburn Harbor, about 1.8 miles north-northeast of Driest Point. The site is in section 8, T. 77 S., R. 92 E., of the Copper River Meridian. It corresponds to loc. 14 in Berg (1972 [I 684]), loc. 133 in Elliott and others (1978), and loc. 14a-c in Karl (1992). The location is accurate within 0.1 mile.

Site location context

Political divisions (FIPS codes)

Prince of Wales-Hyder(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ketchikan A-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

Annette Island Indian Reservation(American Indian Reservation)

American Indian Reservation BIA(Type of land area)

BIA(Federal land areas administered by BIA)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Lead Primary

Materials information

Materials Type of material
Galena Ore
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Local sericitization of trondhjemite.

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 Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Rock unit name Annette Pluton
    Rock description Annette Pluton
    Stratigraphic age (youngest) Late Silurian
    Stratigraphic age (youngest) Late Silurian
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite

Nearby scientific data

(1) -131.58787, 55.20085
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rock at this site is locally sheared and sericitized Silurian trondhjemite that was regionally metamorphosed to greenschist grade in Late Cretaceous time (Berg, 1972). The occurrence consists of galena in a thin, discontinuous, calcite-quartz fissure vein in a subhorizontal shear zone up to 20 feet thick and several hundred feet long. A grab sample of the sulfide-bearing vein assayed 1.38 oz. Au/ton and 0.42 oz. Ag/ton.
  • Age = The fissure vein probably is Late Cretaceous or younger in age.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Mining district

District name Ketchikan

Comments on the workings information

  • Workings / Exploration = A grab sample of the sulfide-bearing vein assayed 1.38 oz. Au/ton and 0.42 oz. Ag/ton (Berg, 1972).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Berg, 1972 (I 684)

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 06-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.