1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Unnamed (ridge NE of Round Mountain)

Occurrence in Alaska, United States with commodity Copper
Map
XML
JSON
KML
C
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 10001610
MRDS ID A012374
Record type Site
Current site name Unnamed (ridge NE of Round Mountain)

Geographic coordinates

Geographic coordinates: -131.54482, 55.21168 (WGS84)
Relative position This site includes 4 occurrences in about a half-mile-square area northeast of Round Mountain. The occurrences are in sections 3, 9, and 10, T. 77 S., R. 92 E., of the Copper River Meridian, and are at elevations of 1200-1500 feet on and near the northeast spur of Round Mountain, and about a mile northeast of the top of the mountain. The map site is at the approximate center of the area of occurrences. The site corresponds to loc. 21 in Berg (1972 [I 684]), loc. 132 in Elliott and others (1978), and loc. 11a-d in Karl (1992). The location is accurate within about 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
Copper Primary

Materials information

Materials Type of material
Malachite Ore
Pyrite Ore
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Local bleaching and iron and copper staining.

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 Sedimentary Rock > Clastic Sedimentary Rock > Conglomerate
    Stratigraphic age (youngest) Late Permian

Nearby scientific data

(1) -131.54482, 55.21168
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The hostrocks of these occurrences are bounded by faults, and consist of recrystallized, Upper Triassic sedimentary and volcanic rocks that unconformably overlie a sequence of undivided, metamorphosed Silurian and Ordovician volcanic, sedimentary, and intrusive rocks (Berg, 1972). The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. ? the occurrences are in bleached, Upper Triassic, rhyolite tuff-breccia, black shale and limestone, and conglomerate. They consist of quartz-calcite-pyrite fissure veins in shear zones; of minute cubes of pyrite disseminated in the country rocks; and of local copper-staining (malachite) (Berg, 1972; Karl, 1992). A sample of felsic tuff-breccia contained 150 ppm Pb; a sample of a quartz-calcite-pyrite fissure vein contained 300 ppm Cu; and a sample of sheared rhyolite breccia contained 700 ppm Pb (Karl, 1992, loc. 11a-d).
  • Age = The fissure veins probably are 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 sample of felsic tuff-breccia contained 150 ppm Pb; a sample of a quartz-calcite-pyrite fissure vein contained 300 ppm Cu; and a sample of sheared rhyolite breccia contained 700 ppm Pb (Karl, 1992, loc. 11a-d).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Karl, 1992

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.