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

Bohemia Basin Nickel-Copper Prospect

Occurrence in Alaska, United States with commodities Nickel, Copper, Cobalt
Map
XML
JSON
KML
B
Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Host and associated rocks
  8. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Land status
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10002327
MRDS ID A013238
Record type Site
Current site name Bohemia Basin Nickel-Copper Prospect
Alternate or previous names North and South Takanis Ore Bodies, Mayflower and Portia Claim Groups.

Geographic coordinates

Geographic coordinates: -136.43427, 57.98471 (WGS84)
Elevation 457
Relative position 0.57 MI NE OF PEAK 2475

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-8(quadrangle 1:63,360 scale)

Sitka NW(quadrangle 1:100,000 scale)

Sitka W OE(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

Comments on the location information

  • USGS B 931-F, PLATE 22; USGS MF-467, LOC. 1; USGS MF-1476 B, LOC. 3. LOCATION IS ON SOUTH TAKANIS ORE BODY. NORTH TAKANIS ORE BODY IS 500 FT. NW. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Commodities

Commodity Importance
Nickel Critical Primary
Copper Primary
Cobalt Critical Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Pentlandite Ore

Analytical data

Result SULFIDE LENSES CONTAIN UP TO 3.6% NI, BUT AVERAGE GRADE IS MUCH LESS-USGS B 931-F, P. 125

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro > Norite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro > Norite

Nearby scientific data

(1) -136.43427, 57.98471
ListMap

Economic information

Ore body information

  • Length 228.6M
    Width 60.96M

Comments on the geologic information

  • NORITE BODY UNDERLAIN BY GABBRO, AMPHIBOLITE SCHIST, HORNFELS. YOUNGER QUARTZ DIORITE IN CONTACT WITH NORITE. GABBRO, NORITE, AND DIORITE BELIEVED TO BE SUCCEEDING DIFFERENTIATES OF MAGMA OF COMPOSITE STOCK.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1921
Discoverer S.H.P. Vevelstad

Mining district

District name Chichagof

Land status

Ownership category National Forest

Comments on the reserve resource information

  • USGS B 931-F, P. 129

Comments on the workings information

  • 3 PROSPECT PITS TOTALING 238 FT., 2 PITS IN SOUTH AND 1 IN NORTH TAKANIS ORE BODIES.

Comments on development

  • OVER 100 CLAIMS STAKED IN AREA. MAYFLOWER AND PORTIA CLAIM GROUPS STAKED IN 1939. SEVERAL PROSPECT PITS DUG BY 1941, BUT NO DRILLING. NO PRODUCTION.

Reference information

Bibliographic references

  • Deposit

    USGS B 931-F, P. 105-138, PLATE 22 (1941)

  • Deposit

    USGS B 947-C, P. 42-55 (1946)

  • Deposit

    USGS MF-467, LOC. 2 (1972)

  • Deposit

    USGS OF 78-450, P. 20-23 (1978)

  • Deposit

    USGS MF-1476-B (1983)

  • Other Database

    BAG-B-931-F-PL-22

General comments

Subject category Comment text
Deposit MAGMATIC SEGREGATIONS OF PYRRHOTITE, PENTLANDITE, CHALCOPYRITE, AND MAGNETITE ERRATICALLY DISTRIBUTED AS BLEBS IN NORITE BODY. ALL SULFIDE-BEARING NORITE LIES WITHIN 250 FT. OF NORITE CONTACT WITH GABBRO AND AMPHIBOLITE SCHIST BENEATH. TWO MAIN ORE BODIES ARE PRESENT, LARGEST BEING SOUTH TAKANIS 550 FT. LONG AND 200 FT. WIDE, AND NORTH TAKANIS, 200 FT. LONG AND 50 FT. WIDE. IN NORTH TAKANIS ORE BODY, SEVERAL MASSIVE SULFIDE LENSES UP TO 3 FT. AND 30 FT. LONG CROP OUT AT SURFACE.
Deposit NORTH AND SOUTH TAKANIS ORE BODIES THOUGHT TO BE CONTINUATION OF SAME MINERALIZED NORITE BODY AS EAST AND WEST TRIPOD, TUNNEL, SIDE HILL, AND NORTH AND SOUTH MUSKEG ORE BODIES 0.7 MI TO THE SE. ; INFO.SRC : 1 PUB LIT
Deposit THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1987 Leonard, Kenneth R. (Huber, Donald F.) 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.