Granite Creek Mine, Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
Regional Level Types | |
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Granite Creek Mine | Mine |
Iditarod Mining District | Mining District |
Yukon-Koyukuk Census Area | Census Area |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
62° 27' 52'' North , 157° 54' 0'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Mindat Locality ID:
197784
Long-form identifier:
mindat:1:2:197784:7
GUID (UUID V4):
99c7f857-693a-4cca-be5d-035cdded041c
Location: About 0.8 miles in the middle portion of Granite Creek has been mined and the workings are shown on the USGS 1:63,360-scale topographic map. The center of the workings is at an elevation of about 600 feet in the SE1/4, section 36, T. 28 N., R. 47 W., of the Seward Meridian. The location is accurate. Granite Creek is locality 32 of Cobb (1972 [MF 363]); also described in Cobb (1976 [OFR 76-576]).
Geology: Placer gold has been mined on Granite Creek since 1910 (Mertie, 1936). The deposit developed where the creek dissects mineralized volcanic and plutonic rocks north of Otter Creek (Bundtzen and others, 1992). The gold fineness averages 854 (Mertie, 1936). Heavy minerals identified in concentrates include gold, arsenopyrite, cinnabar, scheelite, chromite, and ilmenite (Mertie, 1936; Bundtzen, Cox and Veach, 1987). The placer gold was very fine grained and shotty; about 1.5 feet of bedrock was dug up to recover the gold (Cobb, 1976 [OFR 76-576]). Granite Creek has produced at least 4,750 ounces of gold and 636 ounces of silver since the early 20th century (Bundtzen and others, 1992; Miller, Bundtzen, and Gray, 2005). These production estimates derived from incomplete mint records are probably conservative.
Workings: Mining began on Granite Creek in 1908 using scrapers working in open cuts; the most extensive mining took place between 1924 and 1940 (Cobb, 1976 [OFR 76-576]).
Age: Unknown; probably Quaternary.
Production: Granite Creek has produced at least 4,750 ounces of gold and 636 ounces of silver since the early 20th century (Bundtzen and others, 1992; Miller, Bundtzen, and Gray, 2005). These production estimates derived from incomplete mint records are probably conservative.
Commodities (Major) - Au; (Minor) - Ag, As, Cr, Hg, W
Development Status: Yes
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
6 valid minerals.
Detailed Mineral List:
β Arsenopyrite Formula: FeAsS |
β Chromite Formula: Fe2+Cr3+2O4 |
β Cinnabar Formula: HgS |
β Gold Formula: Au |
β Ilmenite Formula: Fe2+TiO3 |
β Scheelite Formula: Ca(WO4) |
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 | Cinnabar | 2.CD.15a | HgS |
β | Arsenopyrite | 2.EB.20 | FeAsS |
Group 4 - Oxides and Hydroxides | |||
β | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
β | Ilmenite | 4.CB.05 | Fe2+TiO3 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
β | Scheelite | 7.GA.05 | Ca(WO4) |
List of minerals for each chemical element
O | Oxygen | |
---|---|---|
O | β Chromite | Fe2+Cr23+O4 |
O | β Ilmenite | Fe2+TiO3 |
O | β Scheelite | Ca(WO4) |
S | Sulfur | |
S | β Arsenopyrite | FeAsS |
S | β Cinnabar | HgS |
Ca | Calcium | |
Ca | β Scheelite | Ca(WO4) |
Ti | Titanium | |
Ti | β Ilmenite | Fe2+TiO3 |
Cr | Chromium | |
Cr | β Chromite | Fe2+Cr23+O4 |
Fe | Iron | |
Fe | β Arsenopyrite | FeAsS |
Fe | β Chromite | Fe2+Cr23+O4 |
Fe | β Ilmenite | Fe2+TiO3 |
As | Arsenic | |
As | β Arsenopyrite | FeAsS |
W | Tungsten | |
W | β Scheelite | Ca(WO4) |
Au | Gold | |
Au | β Gold | Au |
Hg | Mercury | |
Hg | β Cinnabar | HgS |
Other Databases
Link to USGS - Alaska: | ID122 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Farewell buried DomainDomain
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