Brewer Alaska; Brewster; Mile Seven; Sevenmile Prospect, Seward Mining District, Kenai Peninsula Borough, Alaska, USAi
Regional Level Types | |
---|---|
Brewer Alaska; Brewster; Mile Seven; Sevenmile Prospect | Prospect |
Seward Mining District | Mining District |
Kenai Peninsula Borough | Borough |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
60° 13' 42'' North , 149° 24' 28'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Bear Creek | 1,956 (2017) | 7.2km |
Seward | 2,790 (2017) | 13.9km |
Primrose | 111 (2006) | 17.3km |
Moose Pass | 219 (2014) | 28.9km |
Cooper Landing | 289 (2017) | 37.1km |
Mindat Locality ID:
196659
Long-form identifier:
mindat:1:2:196659:9
GUID (UUID V4):
3c316fcb-5d2c-4c84-aa87-7fb2d53f6e6c
The gold to silver ratio in the eight samples collected by the U.S. Bureau of Mines is 1:1 (Hoekzema and Sherman, 1983). An indicated resource with a 1:1 gold to silver ratio is suspect.
Location: The prospect is located in the SW1/4 section 26, T. 2 N., R. 1 W., of the Seward Meridian. It is situated on the east side of Lost Creek at an elevation of about 1,400 feet. This is location 85 of Cobb and Tysdal (1980) and location S-205 of Jansons and others (1984). Cobb and Tysdal (1980) summarized this prospect under the name Mile Seven. This location is accurate to within a quarter of a mile.
Geology: The prospect consists of a 12- to 20-inch-wide quartz-calcite vein that is discontinuously traceable for at least 300 feet. The vein generally parallels the north-south strike of the bedrock and dips steeply to the east (Hoekzema and Sherman, 1983). It is vuggy and has a well-developed ribbon structure. Metallic minerals included arsenopyrite, galena, sphalerite, and gold. The host rock is a blue-black slate of the Valdez Group of Late Cretaceous age (Tysdal, 1978 [MF-880-A]). Workings on the prospect consist of three adits totalling 220 feet in length. The main adit is at an elevation of about 1,400 feet; it consists of a 60-foot crosscut and 110 feet of drift with some stoping. Two short adits with winzes are located about 250 and 750 feet south of the main adit. Improvements included a 2-stamp mill and several cabins (Johnson, 1914 [B 592-G, p. 237-243]). There is no reported production. Eight assay samples contained between less than 0.1 ppm and 28.5 ppm gold (Hoekzema and Sherman, 1983).
Workings: Workings consist of three adits totalling 220 feet in length. The main adit is at an elevation of about 1,400 feet; it consists of a 60-foot crosscut and 110 feet of drift with some stoping. Two short adits with winzes are located about 250 and 750 feet south of the main adit. Improvements included a 2-stamp mill and several cabins (Johnson, 1914 [B 592-G, p. 237-243]). Eight assay samples taken from the main adit and near the portals of the two short adits, contained between less than 0.1 ppm and 28.5 ppm gold (Hoekzema and Sherman, 1983).
Age: Cretaceous or younger; the vein cuts rocks of the Valdez Group of Late Cretaceous age.
Reserves: The U.S. Bureau of Mines estimated 1,100 tons of ore containing 0.3 ounce of gold per ton and 0.3 ounce of silver per ton ( Hoekzema and Sherman, 1983).
Commodities (Major) - Ag, Au; (Minor) - Pb, Zn
Development Status: Undetermined.
Deposit Model: Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
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
6 valid minerals.
Detailed Mineral List:
ⓘ Arsenopyrite Formula: FeAsS |
ⓘ Calcite Formula: CaCO3 |
ⓘ Galena Formula: PbS |
ⓘ Gold Formula: Au |
ⓘ Quartz Formula: SiO2 |
ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Gold | 1.AA.05 | Au |
Group 2 - Sulphides and Sulfosalts | |||
ⓘ | Sphalerite | 2.CB.05a | ZnS |
ⓘ | Galena | 2.CD.10 | PbS |
ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
ⓘ | Calcite | 5.AB.05 | CaCO3 |
List of minerals for each chemical element
C | Carbon | |
---|---|---|
C | ⓘ Calcite | CaCO3 |
O | Oxygen | |
O | ⓘ Calcite | CaCO3 |
O | ⓘ Quartz | SiO2 |
Si | Silicon | |
Si | ⓘ Quartz | SiO2 |
S | Sulfur | |
S | ⓘ Arsenopyrite | FeAsS |
S | ⓘ Galena | PbS |
S | ⓘ Sphalerite | ZnS |
Ca | Calcium | |
Ca | ⓘ Calcite | CaCO3 |
Fe | Iron | |
Fe | ⓘ Arsenopyrite | FeAsS |
Zn | Zinc | |
Zn | ⓘ Sphalerite | ZnS |
As | Arsenic | |
As | ⓘ Arsenopyrite | FeAsS |
Au | Gold | |
Au | ⓘ Gold | Au |
Pb | Lead | |
Pb | ⓘ Galena | PbS |
Other Databases
Link to USGS - Alaska: | SR278 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Chugach DomainDomain
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