Synneva Creek Mine (Scynneva), Bristol Bay Mining District, Lake and Peninsula Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Synneva Creek Mine (Scynneva) | Mine |
| Bristol Bay Mining District | Mining District |
| Lake and Peninsula Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
60° 42' 28'' North , 154° 42' 10'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Mindat Locality ID:
200270
Long-form identifier:
mindat:1:2:200270:8
GUID (UUID V4):
43481f96-6577-4d25-8f4e-4a20aa627ab2
Essentially part of the Bonanza Creek placer deposit.
Location: 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.
Geology: 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.
Workings: 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).
Age: Quaternary.
Alteration: Not applicable
Production: Jasper (1961) mentioned about 35 oz Au production, but probably much more was unreported (Eakins and others, 1978).
Reserves: No reserves
Commodities (Major) - Au; (Minor) - Sn, W
Development Status: Yes; small
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
3 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Cassiterite | 4.DB.05 | SnO2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Cassiterite | SnO2 |
| O | ⓘ Scheelite | Ca(WO4) |
| Ca | Calcium | |
| Ca | ⓘ Scheelite | Ca(WO4) |
| Sn | Tin | |
| Sn | ⓘ Cassiterite | SnO2 |
| W | Tungsten | |
| W | ⓘ Scheelite | Ca(WO4) |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS - Alaska: | LC015 |
|---|
Other Regions, Features and Areas containing this locality
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References
