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Sixmile

Prospect in Alaska, United States with commodities Silver, Gold, 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. 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 10001537
MRDS ID A012284
Record type Site
Current site name Sixmile

Geographic coordinates

Geographic coordinates: -130.06786, 55.99477 (WGS84)
Relative position This prospect is at about 200 feet elevation, adjacent to the east side of the Salmon River road about 6 miles north-northwest of the town of Hyder. The site is at the northwest corner of section 11, T. 68 S., R. 99 E., of the Copper River Meridian. It corresponds to loc. 12 on plate 2 in Buddington (1929 [B 807]), and to loc. 4 in Elliott and others (1978). The location is accurate within 0.1 mile.

Site location context

Political divisions (FIPS codes)

Prince of Wales-Hyder(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ketchikan D-1(quadrangle 1:63,360 scale)

Ketchikan NE(quadrangle 1:100,000 scale)

Ketchikan(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Southern 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

Commodities

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

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Sphalerite 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 Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Texas Creek Granodiorite
    Rock description Texas Creek Granodiorite
    Stratigraphic age (youngest) Early Jurassic
    Stratigraphic age (youngest) Early Jurassic
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite

Nearby scientific data

(1) -130.06786, 55.99477
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks in the area of this site include: pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or Triassic Hazelton Group; recrystallized granodiorite of the Triassic Texas Creek Granodiorite, which intrudes the Hazelton rocks; quartz monzonite and granodiorite of the Hyder Quartz Monzonite batholith, which intrudes the Hazelton and Texas Creek rocks; and Tertiary lamprophyre dikes, which intrude all of the foregoing rock units (Buddington, 1929; Smith, 1973, l977; Berg and others, 1988).? the deposit consists of sulfide-bearing quartz fissure veinlets in a shear zone 5 inches to 5 feet wide in (Texas Creek) granodiorite (Buddington, 1929, p. 76-77; Elliott and others, 1978, loc. 4; Cobb and Elliott, 1980, p. 97; Maas and others, 1995, p. 261). Some of the stringers are rich in free gold, which occurs in the borders of the stringers and in the adjacent granodiorite. Some of the stringers also carry galena, sphalerite, chalcopyrite, and pyrite; and some of these sulfides also are disseminated, or face fractures, in the granodiorite adjacent to the veins. ? Maas and others (1995, p. 254) suggest that sulfide-bearing quartz fissure veins hosted by Texas Creek Granodiorite at the Six Mile prospect are Eocene in age. If so, the age of the deposit is roughly contemporaneous with emplacement of the Hyder Quartz Monzonite batholith.? the prospect was explored in the early 1900s by two adits, 25 and 35 feet long. Picked samples of the richest veins assayed as much as 1080 oz. Au/ton and 200 oz. Ag/ton; samples of the wallrock granodiorite contained an average of 0.05 oz. Au/ton and 2.5 oz. Ag/ton. Samples of a 35-foot-long vein sampled by the U.S. Bureau of Mines in the early 1990s contained up to 3.77 ppm Au, 195.8 ppm Ag, and 2.89% Pb (Maas and others, 1995, p. 261).
  • Age = Maas and others (1995, p. 254) suggest that sulfide-bearing quartz fissure veins hosted by Texas Creek Granodiorite at the Six Mile prospect are Eocene in age. If so, the age of the deposit is roughly contemporaneous with emplacement of the Hyder Quartz Monzonite batholith.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Mining district

District name Hyder

Comments on the workings information

  • Workings / Exploration = The prospect was explored in the early 1900s by two adits, 25 and 35 feet long. Picked samples of the richest veins assayed as much as 1080 oz. Au/ton and 200 oz. Ag/ton; samples of the wallrock granodiorite contained an average of 0.05 oz. Au/ton and 2.5 oz. Ag/ton. Samples of a 35-foot-long vein sampled by the U.S. Bureau of Mines in the early 1990s contained up to 3.77 ppm Au, 195.8 ppm Ag, and 2.89% Pb (Maas and others, 1995, p. 261).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Buddington, 1929 (B807)

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 28-JUN-1999 H.C. Berg 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.