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Nunatak

Prospect in Alaska, United States with commodities Silver, Gold, Barium-Barite, 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 10002191
MRDS ID A013089
Record type Site
Current site name Nunatak
Alternate or previous names Saksaia Glacier

Geographic coordinates

Geographic coordinates: -136.41214, 59.36974 (WGS84)
Relative position The location is in the approximate center of the prospect which extends for about 1,500 feet between 3,800 and 4,500 feet in elevation on a nunatak within the Saksaia Glacier. It is near the center of section 12, T. 29 S., R. 53 E. of the Copper River Meridian. It is shown as location 11 by Cobb (1972 [MF 424]) and in Figure 7 in Still (1984 [OF 118-84]).

Site location context

Political divisions (FIPS codes)

Haines(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Skagway B-4(quadrangle 1:63,360 scale)

Skagway SE(quadrangle 1:100,000 scale)

Skagway C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Chilkat-Skagway Rivers(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Barium-Barite Critical Primary
Copper Primary
Lead Primary
Zinc Critical Primary

Comments on the commodity information

  • Ore Material = sulfosalts
  • Ore Material = sulfosalts

Materials information

Materials Type of material
Barite Ore
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Sphalerite Ore

Alteration

  • (Local) Phyllic.

Mineral occurrence model information

Model code 184
USGS model code 28a
Deposit model name Massive sulfide, kuroko
Mark3 model number 93
Model code 91
USGS model code 24b
Deposit model name Massive sulfide, Besshi (Japanese deposits)
Mark3 model number 30

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Rock unit name Glacier Creek Volcanic Sequence
    Rock description Glacier Creek Volcanic Sequence
    Stratigraphic age (youngest) Late Permian
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite

Nearby scientific data

(1) -136.41214, 59.36974
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = According to Still (1984 [OF 21-84]), the prospect consists of an iron-stained zone of quartz-sericite schist and altered volcanic rocks exposed for 1,500 feet across the face of a nunatak. Barite lenses and beds containing interbedded and remobilized sulfides occur within this zone. The mineral assemblage and field relationships are similar to the Main Zone/Palmer prospect (SK066) (MacKevett and others, 1974). Rubblecrop indicates that some of the baritic beds may be up to 20 feet thick. Samples of the baritic rock contain up to 2.58 ppm gold, 335.3 ppm silver, 2.38% zinc, 1,820 ppm copper, 2.0% lead, 48% barite, and 1,000 ppm arsenic. A 200-pound sample collected by Merrill Palmer was divided into 13 separate samples and analyzed by Newmont Gold Company. The samples averaged 11.84 ounces of silver per ton and 0.092 ounces of gold per ton. This prospect lies along a northwesterly mineral trend that extends through the Cap prospect (SK060) to the Mount Henry Clay prospect (SK068). Rubicon Minerals considers these prospects to all occur at the same mineralized stratigraphic horizon and attributes their distribution to a northwest-trending, shallowly plunging antiform that brings the massive-sulfide horizon close to the surface (Rubicon Minerals, 1998). The Nunatak prospect and other similar prospects in the Mt. Henry Clay area are probably correlative with the Windy Craggy deposit in Canada and the Greens Creek deposit on Admiralty Island and are therefore Late Triassic (Still, 1984 [OF 118-84]; Newberry and others, 1997).
  • Age = The Nunatak prospect and other similar prospects in the Mt. Henry Clay area are probably correlative with the Windy Craggy deposit in Canada and the Greens Creek deposit on Admiralty Island and are, therefore Late Triassic (Still, 1984 (OFR 118-84); Newberry and others, 1997).

Economic information about the deposit and operations

Development status Prospect
Commodity type Both

Comments on exploration

  • Status = Active

Mining district

District name Juneau (Skagway subdistrict)

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Still, 1984 (OF 118-84)

General comments

Subject category Comment text
Deposit Model Name = Besshi- or Kuroko-type volcanogenic massive sulfide deposit (Cox and Singer, 1986; models 24a or 24b).

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-2001 T.C. Crafford T. Crafford & Associates

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.