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Summit Creek

Producer in Alaska, United States with commodities Silver, Gold, Lead, Zinc, Copper
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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. Host and associated rocks
  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 10096788
MRDS ID A013097
Record type Site
Current site name Summit Creek
Alternate or previous names Lost Silver Ledge
Related records 10258454

Geographic coordinates

Geographic coordinates: -136.09212, 59.32974 (WGS84)
Relative position This mine is at an elevation of about 2,000 feet in a steep east-facing gully about 0.6 mile southwest of the mouth of Summit Creek and about 0.5 mile west of the Tsirku River. It is on the southern edge of the SE1/4, section 23, T. 29 S., R. 55 E. of the Copper River Meridian. It is shown as location 13 by Cobb (1972 [MF 424]; number S021 by Wells and others (1986); site N by Still and others (1987); site T by Gilbert and Redman (1989); and site 24 by Still and others (1991).? Based on similar locations and descriptions, it appears nearly certain that the Lost Silver Ledge deposit described by Still and others (1987), Gilbert and Redman (1989), and Still and others (1991) is the same as the Summit Creek deposit described by Eakin (1919), Cobb (1972 [MF-424]), and Wells and others (1986).

Site location context

Political divisions (FIPS codes)

Haines(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Skagway B-3(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)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Lead Primary
Zinc Critical Primary
Copper Secondary

Materials information

Materials Type of material
Galena Ore
Jamesonite Ore
Tetrahedrite Ore
Quartz Gangue

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Host
    Rock type
    Stratigraphic age (youngest) Pennsylvanian
    Stratigraphic age (oldest) Late Silurian
    Chronological age 33
    Stratigraphic age (youngest) Pennsylvanian
    Stratigraphic age (oldest) Late Silurian
  • Host or associated Associated
    Rock type
    Stratigraphic age (youngest) Tertiary
    Chronological age 31.15

Nearby scientific data

(1) -136.09212, 59.32974
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = According to Eakin (1919), the prospect contains narrow silver-lead veins less than 1 foot thick. The maximum metal content was reported to be $3 gold per ton (about 0.14 ounces of gold per ton), about 60 ounces silver per ton, and about 35% lead. One sample contained nearly 3% copper. Berg and others (1981) cite a maximum gold grade of 0.145 ounces per ton and comment that the veinlets contain argentiferous galena.? As reported by Still and others (1991), this prospect consists of quartz-sulfide veins in dolomitic limestone. The veins do not continue into the adjacent slate. A vein that was mined from the surface in the 1930's is up to 0.4 feet wide and is adjacent to a felsic dike. Sulfides from the vein are primarily jamesonite with lesser amounts of galena and tetrahedrite. Samples contain up to 14.19 ppm gold, 871.6 ppm silver, 1,540 ppm zinc, 1.70% copper, and 42.5 % lead. The most prominent vein extends for several hundred feet vertically and samples of it contain 0.05 to 1.32 ppm gold, 346.0 to 3,423.1 ppm silver, 0.193 to 4.89% zinc, and 4.36 to 39.3% lead. The Devonian to Mississippian age of the host carbonate rock establishes a maximum age for the veins while the presence of an adjacent felsic dike suggests a Tertiary age based on the 29.3 + 1 to 33.0 + 1 m.y. age of nearby quartz diorite and granodiorite bodies (Gilbert and others, 1987).
  • Age = The Devonian to Mississippian age of the host carbonate rock establishes a maximum age for the veins while the presence of an adjacent felsic dike suggests a Tertiary age based on the 29.3 + 1 to 33.0 + 1 m.y. age of nearby quartz diorite and granodiorite bodies (Gilbert and others, 1987).
  • Age = Chron age is for nearby intrusive bodies. Host rock is Mississippian - Devonian.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic

Comments on exploration

  • Status = Active?

Mining district

District name Juneau (Skagway subdistrict)

Comments on the production information

  • Production Notes = Based on the size of the stope described by Still and others (1991), production was very small.

Comments on the workings information

  • Workings / Exploration = Workings consist of a 5-foot adit and a stope on a high-grade silver lens mined by a local prospector, R.C. Manuel, in the 1930's. The stope is about 10 feet high, 3 to 5 feet wide, and 20 feet long. (Still and others, 1991).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Still and others, 1991

General comments

Subject category Comment text
Deposit Model Name = Polymetallic quartz-sulfide veins (Cox and Singer, 1986; model 22c).

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

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