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  3. Mineral Resource Data System (MRDS)

Unnamed (around mouth of Cahoon Creek)

Occurrence in Alaska, United States with commodities Gold, Silver
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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 10308248
Record type Site
Current site name Unnamed (around mouth of Cahoon Creek)

Geographic coordinates

Geographic coordinates: -136.24213, 59.38974 (WGS84)
Relative position The location of this occurrence, in the center of section 1, T. 29 S., R. 54 E. of the Copper River Meridian, is somewhat arbitrary and applies to a broad northwest trending band of mineralization. It is taken from Eakin (1919) who describes a northwest trending band of quartz-sulfide veinlets in slate that is 1,200 feet thick and cuts across Cahoon Creek near its mouth. This band is contained within a larger zone of sporadic quartz-sulfide veins and stringers that Eakin describes as extending in a northwesterly direction from the Salmon (Tsirku) River, through Porcupine, Glacier, and Jarvis Creeks to the mountain mass north of the Jarvis Glacier.

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)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Silver Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Sphalerite Ore
Calcite Gangue
Quartz Gangue

Alteration

  • (Local) Some of the larger auriferous quartz-sulfide veins in the vicinity are associated with mafic dikes that have been altered to silica-carbonate rocks (see Golden Eagle (SK047)).

Mineral occurrence model information

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

Nearby scientific data

(1) -136.24213, 59.38974
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Eakin (1918 and 1919) describes a nearly 1,200-foot-wide band of abundant quartz-sulfide veining in slate that cuts across Cahoon Creek near its mouth. He further notes that this zone of abundant veining occurs within a northwest-trending larger area of sediment hosted, discontinuous lode mineralization that consist of quartz, iron sulfides, and calcite veins, veinlets, and lenses that extends from south of the Salmon (Tsirku) River across the basins of Porcupine, Glacier, and Jarvis Creeks and into the mountain mass north of the Jarvis Glacier. Eakin infers that this larger zone of veining is the source of the placer gold in the Klehini and Salmon (Tsirku) River basins. Wright (1904 [B 225 and B 236]) noted that this zone of mineralization occurs in sedimentary rocks in the Porcupine area that are all more or less mineralized by veins of quartz and calcite. Iron sulfides that occur as films and conformable lenticular masses up to a few inches thick form an interrupted zone of mineralization in the southern portion of the sedimentary series. Quartz veins are not abundant and are often stringers parallel to the cleavage of the slate. The few crosscutting quartz veins carry galena, sphalerite, and minor chalcopyrite. Although these quartz-sulfide veins are quite narrow, they often persist for considerable distances. Light-brown-weathering calcite veins are more numerous than quartz veins, are often more than a foot thick; they may include pyrite cubes up to an inch across. Gold has been reported from veins of this nature up McKinley Creek ; see (SK046) and (SK047). MacKevett and others (1974) observed that, 'Lode occurrences are localized mainly in or near the slate in the central part of the B-4 quadrangle, and the placers are mainly along streams that drain the slate terrane.'
  • Age = Unknown, but probably Cretaceous or younger based on the age of intrusives in the area (MacKevett and others, 1974).

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

Bibliographic references

Comments on the references

  • Primary Reference = Hoekzema and others, 1986

General comments

Subject category Comment text
Deposit Model Name = Auriferous quartz-sulfide veins in slate and in silica-carbonate-altered mafic dikes (Cox and Singer, 1986; model 22c).

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.