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

Big Ledge

Prospect in Alaska, United States with commodities Copper, Nickel, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Nearby scientific data
  8. Economic information about the deposit and operations
  9. Mineral rights holdings
  10. Land status
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10282613
MRDS ID A013295
MAS/MILS ID 0021140015
Record type Site
Current site name Big Ledge
Alternate or previous names Mosquito Ledge, Lost Prize, Coronado Copper & Zinc
Related records 10002377

Geographic coordinates

Point of reference Claim
Geographic coordinates: -134.9839, 57.80533 (WGS84)
Elevation 122
Location accuracy 1000(meters)

Site location context

Political divisions (FIPS codes)

Hoonah-Angoon(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sitka D-3(quadrangle 1:63,360 scale)

Sitka NE(quadrangle 1:100,000 scale)

Sitka(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Central Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Public Land Survey System information

Meridian Township Range Section Fraction State
Copper River 047 S 064 E 12 NESWSW Alaska

Commodities

Commodity Importance
Copper Tertiary
Nickel Critical Primary
Zinc Critical Tertiary

Nearby scientific data

Claim (1) -134.9839, 57.80533
ListMap

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic
Deposit size Small
Significant No

Mineral rights holdings

Type of mineral rights Located Claim

Land status

Ownership category Federal

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit STAKED 1923, ABANDONED, RESTAKED 1955. ACTIVE THROUGH 1957. INACTIVE 1976. VERY LITTLE DEVELOPMENT WORK. COMPOSED OF DISSEMINATED PYRRHOTITE, CHALLOPYRITE, PENT- LANDITE,SPHALERITE,PYRITE IN A MAFIC DIKE. SULFIDES ALSO AS VEINLETS & BLEBS IN SHEAR ZONES & QTZ-CALCITE VEINS. VALUES APPARENTLY TOO LOW TO CONTINUE DEVELOPMENT.

Reporter information

Type Date Name Affiliation Comment
Reporter 12-FEB-1988 Map U.S. Bureau of Mines

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.