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Unnamed (near Tukgahgo Mountain)

Occurrence in Alaska, United States with commodities Silver, Gold, Copper, Palladium, Platinum
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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. Mineral occurrence model information
  8. Nearby scientific data
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10308242
Record type Site
Current site name Unnamed (near Tukgahgo Mountain)

Geographic coordinates

Geographic coordinates: -135.63211, 59.29975 (WGS84)
Relative position The location of this occurrence is in the approximate center of an area that includes Tukgahgo Mountain, the ridge extending to the east from Tukgahgo Mountain, and VABM 4520 ('Chilly'), to the southwest of Tukgahgo Mountain. It is within the area of anomalously high samples 804 to 817 shown on sheet 2 of Gilbert and others (1991). The occurrences were informally named 'Chilly' by Still and others (1991).

Site location context

Political divisions (FIPS codes)

Haines(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Skagway B-2(quadrangle 1:63,360 scale)

Skagway SE(quadrangle 1:100,000 scale)

Skagway(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)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Palladium Critical Secondary
Platinum Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Malachite Ore
Molybdenite Ore
Pyrite Ore
Quartz Gangue

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -135.63211, 59.29975
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Economic information

Comments on the geologic information

  • Geologic Description = The following description is from Still and others (1991). The geology of the area consists of roof pendants of metabasalt and amphibolite surrounded by hornblende diorite, granodiorite and monzonite. Sporadic narrow and discontinuous quartz veins occur in the area, mostly near the northwesterly trending, Tukgahgo Mountain fault. A sample collected across a vein with visible molybdenite contained 1,240 ppm molybdenum. Seven samples analyzed for platinum and palladium contained from nil to 0.09 ppm platinum and from 0.004 to 0.07 ppm palladium. The source of the platinum and palladium may be ultramafic rocks that crop out several miles to the southeast of this area. Descriptions of samples collected from this area by Gilbert and others (1991) include numerous references to quartz veins with pyrite; chalcopyrite, malachite, and molybdenite are also mentioned in some descriptions. Samples contained up to 0.824 ppm gold, 2.70 ppm silver, and 2,140 ppm copper. The intrusive rocks are part of the Mount Kashagnak pluton (Redman and others 1984). It's mid-Cretaceous age establishes a maximum age for the mineralization.
  • Age = Mid-Cretaceous or younger based on the age of the Mount Kashagnak pluton that hosts the deposits (Redman and others, 1984).

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Probably inactive

Mining district

District name Juneau (Skagway subdistrict)

Reference information

Comments on the references

  • Primary Reference = Gilbert and others, 1991

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins (?) (Cox and Singer, 1986; model 22c?).
Deposit Other Comments = the Alaska, Chilkat Bald Eagle Preserve is less than 1 mile to the west of these occurrences.

Reporter information

Type Date Name Affiliation Comment
Reporter 04-FEB-01 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.