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Synneva (Scynneva) Creek

Past Producer in Alaska, United States with commodities Gold, Tin, Tungsten
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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 10002113
MRDS ID A013004
Record type Site
Current site name Synneva (Scynneva) Creek
Related records 10161055

Geographic coordinates

Geographic coordinates: -154.70577, 60.70749 (WGS84)
Relative position Locality is a 215 m long cut along Synneva Creek, about 270 m upstream from confluence of Bonanza Creek and Synneva Creek. This is part of locality 7 Nelson and others (1985) and locality 7 of Cobb (1972). SE1/4SW1/4 sec. 10, T. 7 N., R. 31 W., of the Seward Meridian. Locality is accurate to within 100 m.

Site location context

Political divisions (FIPS codes)

Lake and Peninsula(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lake Clark C-5(quadrangle 1:63,360 scale)

Lake Clark NW(quadrangle 1:100,000 scale)

Lake Clark C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Mulchatna River(hydrologic unit)

Nushagak River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Tin Critical Secondary
Tungsten Critical Secondary

Materials information

Materials Type of material
Cassiterite Ore
Gold Ore
Scheelite Ore

Alteration

  • (Local) Not applicable

Mineral occurrence model information

Model code 119
USGS model code 39a
Deposit model name Placer Au-PGE
Mark3 model number 54

Nearby scientific data

(1) -154.70577, 60.70749
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = Synneva (Scynneva) Creek is a placer gold deposit. Analysis of heavy concentrates yield 60 percent cassiterite and 1.36 percent tungsten (Eakins and others, 1978). Jasper (1961) reported: evidence indicates that glacial scouring was not an important erosional factor in this area, it is believed that pre-glacial alluvials were undisturbed, and that placer gold concentrations remain more or less as originally deposited along the creek. The valley alluvials are mostly uniform gravels with some boulders, interpreted as reworked glacial deposits. Bedrock is shale, argillite, and graywacke cut by porphyritic granitic dikes. The sediments strike N 40 to 45 E, and dip varies from 60 to 75 SW.
  • Age = Quaternary.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Probably inactive

Mining district

District name Bristol Bay

Comments on the production information

  • Production Notes = Jasper (1961) mentioned about 35 oz Au production, but probably much more was unreported (Eakins and others, 1978).

Comments on the reserve resource information

  • Reserves = No reserves

Comments on the workings information

  • Workings / Exploration = Work began in about 1957, and was limited to hand methods (ground-sluice and shovel-in). One man worked the mouth of the narrow gulch moving about 800 to 900 cubic yards, from which an unconfirmed $1,200 was recovered. There was no evidence to indicate that bedrock had been reached (Jasper, 1961).? Analysis of heavy concentrates yield 60 percent cassiterite and 1.36 percent tungsten (Eakins and others, 1978).

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Eakins and others, 1978

General comments

Subject category Comment text
Deposit Model Name = Placer Au (Cox and Singer, 1986; model 39a)
Deposit Other Comments = Essentially part of the Bonanza Creek placer deposit.

Reporter information

Type Date Name Affiliation Comment
Reporter 15-JUN-98 M.L. Miller U.S. Geological Survey
Reporter 15-JUN-98 D.P. Bickerstaff 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.