Headwall Prospect, Aniak Mining District, Bethel Census Area, Alaska, USAi
Regional Level Types | |
---|---|
Headwall Prospect | Prospect |
Aniak Mining District | Mining District |
Bethel Census Area | Census Area |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
61° 39' 28'' North , 159° 6' 39'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
Place | Population | Distance |
---|---|---|
Chuathbaluk | 125 (2017) | 11.9km |
Aniak | 528 (2017) | 23.5km |
Mindat Locality ID:
197928
Long-form identifier:
mindat:1:2:197928:5
GUID (UUID V4):
eb2bb0f0-e83f-4555-9f0f-17a09a90f282
Location: This prospect is in the Russian Mountains on the northeast flank of the sharp ridge between the headwaters of Cobalt and Mission Creeks. The map site is in the SW1/4 sec. 8, T. 18 N., R. 54 W., of the Seward Meridian. It is at an elevation of about 2,350 feet, about 0.15 mile south-southwest of a small cirque-basin lake. It is sample locality 14 of Bundtzen and Laird (1991).
Geology: The Headwall prospect is in syenite and includes several 10-foot wide banded tourmaline greisen zones that trend northwest for a distance of at least 790 feet (Bundtzen and Laird, 1991). The zones are exposed over a vertical range of 400 feet. The tourmaline greisens contain euhedral quartz, along with sericite and sulfide veinlets and clots. Arsenopyrite, native bismuth, pekoite, galena, bindheimite, and scorodite have been identified in the sulfide-rich assemblages (Bundtzen and Laird, 1991). The sulfide-bearing zones are disrupted by later faulting. Six channel samples average 3.3 ppm gold, 7.32 percent arsenic, 0.16 percent antimony, and 0.04 percent tin. Bismuth, copper, and lead analyses are not available. Assuming dimensions, in feet, of 4.45 x 400 x 790, Bundtzen and Laird (1991) estimated a resource of 82,900 tons of material with the stated average grades. The host rocks are part of the Upper Cretaceous intrusive complex of the Russian Mountains.
Workings: Surface observation and sampling has been completed (Bundtzen and Laird, 1991).
Age: Late Cretaceous or Tertiary. Greisens crosscut part of the intrusive complex of the Russian Mountains. Quartz monzonite from this complex has yielded a K/Ar age of 70.3 +/- 2.1 Ma (Bundtzen and Laird, 1991).
Alteration: Silicification and tourmalinization.
Reserves: Assuming dimensions, in feet, of 4.45 x 400 x 790, Bundtzen and Laird (1991) estimate a resource of 82,900 tons of material with average grades of 3.3 ppm gold, 7.32 percent arsenic, 0.16 percent antimony, and 0.04 percent tin. Bismuth, copper, and lead analyses are not available.
Commodities (Major) - Au, Sb, Sn; (Minor) - Cu, Pb
Development Status: None
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
8 valid minerals.
Detailed Mineral List:
ⓘ Arsenopyrite Formula: FeAsS |
ⓘ 'Bindheimite' Formula: Pb2Sb2O6O |
ⓘ Bismuth Formula: Bi |
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ Galena Formula: PbS |
ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
ⓘ Pekoite Formula: PbCuBi11S18 |
ⓘ Quartz Formula: SiO2 |
ⓘ Scorodite Formula: Fe3+AsO4 · 2H2O |
ⓘ 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Bismuth | 1.CA.05 | Bi |
Group 2 - Sulphides and Sulfosalts | |||
ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
ⓘ | Galena | 2.CD.10 | PbS |
ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
ⓘ | Pekoite | 2.HB.05a | PbCuBi11S18 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Quartz | 4.DA.05 | SiO2 |
ⓘ | 'Bindheimite' | 4.DH.20 | Pb2Sb2O6O |
Group 8 - Phosphates, Arsenates and Vanadates | |||
ⓘ | Scorodite | 8.CD.10 | Fe3+AsO4 · 2H2O |
Group 9 - Silicates | |||
ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
Unclassified | |||
ⓘ | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
H | ⓘ Scorodite | Fe3+AsO4 · 2H2O |
H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
B | Boron | |
B | ⓘ Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
O | Oxygen | |
O | ⓘ Bindheimite | Pb2Sb2O6O |
O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
O | ⓘ Quartz | SiO2 |
O | ⓘ Scorodite | Fe3+AsO4 · 2H2O |
O | ⓘ Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Al | Aluminium | |
Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Si | Silicon | |
Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
Si | ⓘ Quartz | SiO2 |
Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
S | Sulfur | |
S | ⓘ Arsenopyrite | FeAsS |
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Galena | PbS |
S | ⓘ Pekoite | PbCuBi11S18 |
K | Potassium | |
K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Fe | Iron | |
Fe | ⓘ Arsenopyrite | FeAsS |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Scorodite | Fe3+AsO4 · 2H2O |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Cu | ⓘ Pekoite | PbCuBi11S18 |
As | Arsenic | |
As | ⓘ Arsenopyrite | FeAsS |
As | ⓘ Scorodite | Fe3+AsO4 · 2H2O |
Sb | Antimony | |
Sb | ⓘ Bindheimite | Pb2Sb2O6O |
Pb | Lead | |
Pb | ⓘ Bindheimite | Pb2Sb2O6O |
Pb | ⓘ Galena | PbS |
Pb | ⓘ Pekoite | PbCuBi11S18 |
Bi | Bismuth | |
Bi | ⓘ Bismuth | Bi |
Bi | ⓘ Pekoite | PbCuBi11S18 |
Other Databases
Link to USGS - Alaska: | RM018 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Farewell buried DomainDomain
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