Hopeful Gulch Prospect, Koyuk Mining District, Nome Census Area, Alaska, USAi
Regional Level Types | |
---|---|
Hopeful Gulch Prospect | Prospect |
Koyuk Mining District | Mining District |
Nome Census Area | Census Area |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
64° 33' 0'' North , 160° 45' 32'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Shaktoolik | 258 (2017) | 30.2km |
Koyuk | 342 (2017) | 46.5km |
Mindat Locality ID:
198044
Long-form identifier:
mindat:1:2:198044:1
GUID (UUID V4):
04a14990-d979-4549-a2e4-b5b92e1553bd
Location: Hopeful Gulch is a short, west tributary to the Ungalik River that is not named on U.S. Geological Survey topographic maps. It is opposite the mouth of Bonanza Creek (NR008). The coordinates are for the abandoned mine camp marked on the Norton River C-4 topographic map (1950). Hopeful Gulch is locality 2 of Cobb (1972 [MF 381]). The location is accurate within 500 feet.
Geology: The country rocks in the vicinity of Hopeful Gulch consist of Cretaceous, medium to fine-grained, mottled, dark gray diorite composed mostly of quartz, feldspar, and biotite. Disseminated pyrite is also present (Anderson, 1944). Anderson (1944) lists the following minerals in concentrates from Hopeful Gulch (in order of abundance): magnetite, epidote, apatite, scheelite, bismuthinite, wolframite, garnet, hornblende, zircon, feldspars, chlorite, augite, gold, amalgam, and calcite. Gold was discovered nearby on Bonanza Creek (NR008) in 1889 and that area was mined until at least 1918. The Ungalik River (NR008) was mined intermittently until 1987 or 1988 (Bundtzen and others, 1992). Although there is no record of mining at Hopeful Gulch, some probably took place in the early 1900s.
Age: Quaternary. The source of the gold, bismuthinite, scheelite, and wolframite in the concentrates may be the contact zone of the diorite (Cobb, 1973 [B 1374]).
Production: Although there is no record of mining at Hopeful Gulch, some probably took place in the early 1900s.
Commodities (Major) - Au, Bi, W
Development Status: Undetermined.
Deposit Model: Placer Bi-W-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
5 valid minerals.
Detailed Mineral List:
ⓘ Bismuthinite Formula: Bi2S3 |
ⓘ Gold Formula: Au |
ⓘ Pyrite Formula: FeS2 |
ⓘ Scheelite Formula: Ca(WO4) |
ⓘ Silver Formula: Ag |
ⓘ Silver var. Native Amalgam Formula: (Ag,Hg) |
ⓘ 'Wolframite Group' |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Silver var. Native Amalgam | 1.AA.05 | (Ag,Hg) |
ⓘ | Gold | 1.AA.05 | Au |
ⓘ | Silver | 1.AA.05 | Ag |
Group 2 - Sulphides and Sulfosalts | |||
ⓘ | Bismuthinite | 2.DB.05 | Bi2S3 |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | 'Wolframite Group' | 4.DB.30 va | |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
List of minerals for each chemical element
O | Oxygen | |
---|---|---|
O | ⓘ Scheelite | Ca(WO4) |
S | Sulfur | |
S | ⓘ Bismuthinite | Bi2S3 |
S | ⓘ Pyrite | FeS2 |
Ca | Calcium | |
Ca | ⓘ Scheelite | Ca(WO4) |
Fe | Iron | |
Fe | ⓘ Pyrite | FeS2 |
Ag | Silver | |
Ag | ⓘ Silver var. Native Amalgam | (Ag,Hg) |
Ag | ⓘ Silver | Ag |
W | Tungsten | |
W | ⓘ Scheelite | Ca(WO4) |
Au | Gold | |
Au | ⓘ Gold | Au |
Hg | Mercury | |
Hg | ⓘ Silver var. Native Amalgam | (Ag,Hg) |
Bi | Bismuth | |
Bi | ⓘ Bismuthinite | Bi2S3 |
Other Databases
Link to USGS - Alaska: | NR010 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Koyukuk-Selawik DomainDomain
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