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Nataga Skyline

Prospect in Alaska, United States with commodities Silver, Copper, Molybdenum, 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. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10308259
Record type Site
Current site name Nataga Skyline

Geographic coordinates

Geographic coordinates: -136.29215, 59.60974 (WGS84)
Relative position This prospect is approximately 0.2 miles from the Alaska-British Columbia border and about 2.5 miles, N68E of the sharp bend in the border that occurs at Mount Seltat. It is shown as number 1 on sheet 1 of 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 C-4(quadrangle 1:63,360 scale)

Skagway NE(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)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Molybdenum Primary
Zinc Critical Primary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Ferrimolybdite Ore
Galena Ore
Magnetite Ore
Molybdenite Ore
Pyrite Ore
Pyrrhotite Ore
Scheelite Ore
Sphalerite Ore
Actinolite Gangue
Diopside Gangue
Epidote Gangue
Garnet Gangue
Quartz Gangue

Alteration

  • (Local) Skarn.

Mineral occurrence model information

Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8
Model code 60
USGS model code 18c
Deposit model name Skarn Zn-Pb
Mark3 model number 22

Nearby scientific data

(1) -136.29215, 59.60974
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Still and others (1991) report that a 40-foot adit and several prospect pits at this site that were driven on sphalerite-rich skarn were probably developed before World War II. An open cut was dug into highly weathered gossan which contains abundant arsenopyrite. The following description is summarized from Still and others (1991) who attribute the information to a personal communication from A. H. Clough (1989). The mineralization is in a skarn zone of unknown thickness that is at least 300 feet wide and 2,500 feet long. The skarn zone includes gray marble, biotite schist, and garnet-epidote-diopside-actinolite-quartz skarn. Ore minerals include magnetite, sphalerite, galena, chalcopyrite, arsenopyrite, pyrite, pyrrhotite, and scheelite. Granitic rocks of variable composition and texture occur outside of the skarn zone; fine- to medium-grained diorite was the most common. Porphyritic latite dikes and very fine-grained siliceous alaskite were also noted. Southwest of the skarn zone, granular iron-stained granite contained sparse fine-grained molybdenite and ferrimolybdite. The mineralization is scattered throughout the skarn zone; sphalerite is the most common ore mineral. Magnetite and/or pyrrhotite were present in all of the skarn. The actual margins of the skarn zone were not observed. Still and others (1991) cite the following sample results. A sample of skarn with visible chalcopyrite and galena from a 40-foot adit at the site contained 511 ppm copper and 1,883 ppm zinc. A sample of the gossan with arsenopyrite from the open cut contained 15.7 ppm silver, 4,206 ppm copper, and 17,982 ppm zinc. The age of the skarn alteration and mineralization is not well established and published detailed geologic mapping is lacking in the vicinity of this prospect. However, Cretaceous to Tertiary intrusive rocks mapped to the east by Gilbert and others (1990) suggest a similar age for this mineralization.
  • Age = Probably Cretaceous or Tertiary based on the ages of intrusive rocks mapped to the east by Gilbert and others (1990).

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Probably inactive

Mining district

District name Juneau (Skagway subdistrict)

Comments on the workings information

  • Workings / Exploration = A 40-foot adit, several prospect pits, and an open cut were developed, probably before World War II (Still and others, 1991).

Reference information

Comments on the references

  • Primary Reference = Still and others, 1991

General comments

Subject category Comment text
Deposit Model Name = Polymetallic skarn (Cox and Singer, 1986; model 18b or 18c).

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.