Tolstoi Creek Prospect (ARDF - ID007), Innoko Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
Regional Level Types | |
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Tolstoi Creek Prospect (ARDF - ID007) | Prospect |
Innoko Mining District | Mining District |
Yukon-Koyukuk Census Area | Census Area |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
62° 58' 57'' North , 156° 59' 49'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Mindat Locality ID:
200385
Long-form identifier:
mindat:1:2:200385:9
GUID (UUID V4):
7683a2de-726d-431b-b2f0-5fee09c91119
Location: This prospect at an elevation of about 1,400 feet on an unnamed tributary of Tolstoi Creek. It is about 1.0 mile north of hill 2008 and about 0.4 mile southwest of the northeast corner of section 2, T. 33 N., R. 41 W., of the Seward Meridian. The location is accurate.
Geology: The Tolstoi Creek prospect is a black-sand-rich gold placer that contains visible gold, abundant magnetite, ilmenite, less abundant ilmenorutile, a Nb-Ta mineral, cinnabar, tourmaline (variety dravite), and a trace of chalcopyrite (Bundtzen, Cox and Veach, 1987). The creek is about 30 feet wide and is incised in glacial moraine of late Pleistocene age. The alluvium is poorly sorted; most of the gold and heavy minerals occur in sand and gravel that is interstitial to erratic boulders that originated in the Beaver Mountains (Bundtzen and Laird, 1980). The placer gold is mostly fine-grained with occasional grains to 5 mm across. Six pans collected at intervals across the creek contained from 1 to 5 grains of gold per pan (Bundtzen, Cox and Veach, 1987). The average fineness of the placer gold as determined by fire assay is 891. One placer concentrate contained 214 parts per million (ppm) niobium 14 ppm tantalum, 8.1 ppm gold, and 1.0 ppm silver (Bundtzen, Cox, and Veach, 1987).
Workings: Placer occurrences in this area were prospected during the early part of the 20th century (Mertie, 1936). The placer was sampled by the Alaska Division of Geological and Geophysical Surveys in the 1980s (Bundtzen, Cox, and Veach, 1987).
Age: The prospect is in reworked, glacial moraine of Late Pleistocene (Wisconsin?) age and the placer is either late Pleistocene or Holocene in age (Bundtzen, 1980 [GR 63]).
Alteration: None.
Production: No known production.
Commodities (Major) - Au; (Minor) - Cu, Hg, Nb, Ta
Development Status: None
Deposit Model: Placer Au deposit (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
7 valid minerals.
Detailed Mineral List:
β Chalcopyrite Formula: CuFeS2 |
β Cinnabar Formula: HgS |
β Dravite Formula: NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
β Gold Formula: Au |
β Ilmenite Formula: Fe2+TiO3 |
β Magnetite Formula: Fe2+Fe3+2O4 |
β Rutile Formula: TiO2 |
β Rutile var. Ilmenorutile Formula: (Ti,Nb)O2 |
β 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
β | Gold | 1.AA.05 | Au |
Group 2 - Sulphides and Sulfosalts | |||
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Cinnabar | 2.CD.15a | HgS |
Group 4 - Oxides and Hydroxides | |||
β | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
β | Ilmenite | 4.CB.05 | Fe2+TiO3 |
β | Rutile var. Ilmenorutile | 4.DB.05 | (Ti,Nb)O2 |
β | 4.DB.05 | TiO2 | |
Group 9 - Silicates | |||
β | Dravite | 9.CK.05 | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
Unclassified | |||
β | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
B | Boron | |
B | β Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
B | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
O | Oxygen | |
O | β Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
O | β Ilmenite | Fe2+TiO3 |
O | β Rutile var. Ilmenorutile | (Ti,Nb)O2 |
O | β Magnetite | Fe2+Fe23+O4 |
O | β Rutile | TiO2 |
O | β Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
Na | Sodium | |
Na | β Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
Mg | Magnesium | |
Mg | β Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
Al | Aluminium | |
Al | β Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
Si | Silicon | |
Si | β Dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3(OH) |
S | Sulfur | |
S | β Chalcopyrite | CuFeS2 |
S | β Cinnabar | HgS |
Ti | Titanium | |
Ti | β Ilmenite | Fe2+TiO3 |
Ti | β Rutile var. Ilmenorutile | (Ti,Nb)O2 |
Ti | β Rutile | TiO2 |
Fe | Iron | |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Ilmenite | Fe2+TiO3 |
Fe | β Magnetite | Fe2+Fe23+O4 |
Cu | Copper | |
Cu | β Chalcopyrite | CuFeS2 |
Nb | Niobium | |
Nb | β Rutile var. Ilmenorutile | (Ti,Nb)O2 |
Au | Gold | |
Au | β Gold | Au |
Hg | Mercury | |
Hg | β Cinnabar | HgS |
Other Databases
Link to USGS - Alaska: | ID007 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Farewell buried DomainDomain
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