Kahiltna River; Sholan Bar; Round Bend Bar; Red Hill Bar; Boulder Bench Mine, Yentna Mining District, Matanuska-Susitna Borough, Alaska, USAi
Regional Level Types | |
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Kahiltna River; Sholan Bar; Round Bend Bar; Red Hill Bar; Boulder Bench Mine | Mine |
Yentna Mining District | Mining District |
Matanuska-Susitna Borough | Borough |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
62° 10' 22'' North , 150° 52' 58'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Mindat Locality ID:
198290
Long-form identifier:
mindat:1:2:198290:2
GUID (UUID V4):
8265259f-1ec9-44a0-a9bf-baa9215b9257
Gold has also been reported in stream and bench placers on Lake Creek (TL065), which runs parallel to the Kahiltna River on its west side. See also ARDF records TY027, 028, 029 in the Tyonek quadrangle.
Location: U.S. Bureau of Mines MAS/MILS database (1998) locates this area near the confluence of Peters Creek and Kahiltna River on a circular bar in the northwest quarter of Section 14, T. 24 N., R. 9 W., of the Seward Meridian; this placer extends several hundred feet up and down stream from the coordinates given. Also shown as locality 66 by Reed and others, 1978.
Geology: At this locality Bates and Wedow (1953) report stream gravels 6 to 9 feet deep, several hundred yards wide that contain the following ore minerals in concentrate samples: cassiterite, gold, hematite, ilmenite, magnetite, monazite, platinum, scheelite, thorianite, uranothorianite. Robinson and others (1955, p. 2) report concentrates from Sholan Bar contain 0.14% U, 0.05% ThO2, 0.237% eU in concentrates and Round Bend Bar 0.08% U, 0.19% eU in concentrates. Robinson and others (1955, p. 2, 21-22) also report variable amounts of apatite, feldspar, garnet, limonite, pyroxene, quartz, sphene, spinel, tourmaline, zircon in the concentrates. A prospector's sample from a drill hole on the Kahiltna River (probably from Red Hill Bar) contained approximately 25% ilmenite, 20% monazite, 15% zircon, 15% magnetite, 5% platinum, 5% scheelite, 5% uranothorianite, 5% garnet, 3% cassiterite and 2% sphene. Gold has also been reported in stream and bench placers on Lake Creek (TL065), which runs parallel to the Kahiltna River on its west side. Also see ARDF records TY027, 028, 029 in the Tyonek quadrangle.
Workings: The drainage has been prospected and mined by various small scale surface methods.
Age: Pleistocene.
Commodities (Major) - Au; (Minor) - Fe, Pt, Sn, Th, U, W, Zr
Development Status: Undetermined.
Deposit Model: Placer Au-PGE (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
12 valid minerals.
Detailed Mineral List:
ⓘ 'Apatite' Formula: Ca5(PO4)3(Cl/F/OH) |
ⓘ Cassiterite Formula: SnO2 |
ⓘ 'Feldspar Group' |
ⓘ 'Garnet Group' Formula: X3Z2(SiO4)3 |
ⓘ Gold Formula: Au |
ⓘ Hematite Formula: Fe2O3 |
ⓘ Ilmenite Formula: Fe2+TiO3 |
ⓘ 'Limonite' |
ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
ⓘ 'Monazite' Formula: REE(PO4) |
ⓘ Platinum Formula: Pt |
ⓘ 'Pyroxene Group' Formula: ADSi2O6 |
ⓘ Quartz Formula: SiO2 |
ⓘ Scheelite Formula: Ca(WO4) |
ⓘ Spinel Formula: MgAl2O4 |
ⓘ Thorianite Formula: ThO2 |
ⓘ Thorianite var. Uranothorianite Formula: (Th,U)O2 |
ⓘ Titanite Formula: CaTi(SiO4)O |
ⓘ 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
ⓘ Zircon Formula: Zr(SiO4) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Gold | 1.AA.05 | Au |
ⓘ | Platinum | 1.AF.10 | Pt |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Spinel | 4.BB.05 | MgAl2O4 |
ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
ⓘ | Hematite | 4.CB.05 | Fe2O3 |
ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
ⓘ | Quartz | 4.DA.05 | SiO2 |
ⓘ | Cassiterite | 4.DB.05 | SnO2 |
ⓘ | Thorianite var. Uranothorianite | 4.DL.05 | (Th,U)O2 |
ⓘ | 4.DL.05 | ThO2 | |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
Group 9 - Silicates | |||
ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
ⓘ | Titanite | 9.AG.15 | CaTi(SiO4)O |
Unclassified | |||
ⓘ | 'Feldspar Group' | - | |
ⓘ | 'Monazite' | - | REE(PO4) |
ⓘ | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
ⓘ | 'Limonite' | - | |
ⓘ | 'Pyroxene Group' | - | ADSi2O6 |
ⓘ | 'Garnet Group' | - | X3Z2(SiO4)3 |
ⓘ | 'Apatite' | - | Ca5(PO4)3(Cl/F/OH) |
List of minerals for each chemical element
Other Databases
Link to USGS - Alaska: | TL048 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Susitna BasinBasin
- Wrangellia DomainDomain
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