PG East Occurrence, Tok Mining District, Southeast Fairbanks Census Area, Alaska, USAi
Regional Level Types | |
---|---|
PG East Occurrence | Occurrence |
Tok Mining District | Mining District |
Southeast Fairbanks Census Area | Census Area |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
63° 20' 24'' North , 144° 20' 45'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Mindat Locality ID:
199375
Long-form identifier:
mindat:1:2:199375:5
GUID (UUID V4):
ff55c1ef-5e2c-41a2-ad70-390d2dd0b9cf
Unpublished data cited is available for viewing by contacting Grayd Resources Inc. in Vancouver, B. C., Canada (www.grayd.com), or Northern Associates Inc. in Fairbanks, Alaska.
Location: The PG East occurrence is approximately 0.4 mile west of peak 7523 at an elevation of about 6,400 feet. It is about one-third mile west of the center of section 18, T. 18 N., R. 6 E., Copper River Meridian. The location is accurate.
Geology: The PG East massive sulfide occurrence is a low-grade sulfide layer or unit within the Tushtena Pass unit. With the PG Southeast prospect (MH263), PG East is part of a 2-mile-long zone of intermittently exposed semimassive and massive sulfides. The sulfides are predominantly pyrite and pyrrhotite with minor chalcopyrite. Massive sulfides reach 2 feet in thickness, and semimassive sulfides are as much as 25 feet thick. Base metal grades are very low. Copper is generally below 0.1 percent, lead, zinc, and silver values do not exceed background, and gold values are about 30 parts per billion (E. Hunter, unpublished data, 1998). The Tushtena Pass unit that hosts the PG East occurrence consists of medium- to coarse-grained, calcareous, quartz-sericite-chlorite-schist with local carbonate interbeds. The unit is is typically green to gray, foliated, schistose to blocky, laminated to medium-bedded, quartz-eye bearing, quartz-rich rocks with subordinate muscovite, sericite, and chlorite. In many places, sheared zones are the loci of pervasive iron-carbonate alteration that weathers to a distinct reddish hue. Discontinuous bands of siliceous limestone, dolomite, marble, and black, weakly pyritic metasiltstones are common (Dashevsky and others, 2003).
Workings: Only preliminary surface examination of this sulfide occurrence; there are no significantly elevated base or precious metals reported with the iron sulfides (E. Hunter, unpublished data, 1998).
Age: The Drum unit, which is part of the metamorphic sequence that includes the rocks at this deposit, has been dated at the Devonian-Mississippian boundary on the basis of one SHRIMP U-Pb zircon age of 359 +/- 6 Ma at the nearby DD South prospect (MH325) (Dashevsky and others, 2003).
Commodities (Major) - Fe; (Minor) - Cu
Development Status: None
Deposit Model: Kuroko massive sulfide (Cox and Singer, 1986; model
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:
ⓘ Calcite Formula: CaCO3 |
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ 'Chlorite Group' |
ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 |
ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 |
ⓘ Pyrite Formula: FeS2 |
ⓘ Pyrrhotite Formula: Fe1-xS |
ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
ⓘ | Calcite | 5.AB.05 | CaCO3 |
Group 9 - Silicates | |||
ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
Unclassified | |||
ⓘ | 'Chlorite Group' | - |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
C | Carbon | |
C | ⓘ Calcite | CaCO3 |
O | Oxygen | |
O | ⓘ Calcite | CaCO3 |
O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
O | ⓘ Quartz | SiO2 |
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 | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Pyrite | FeS2 |
S | ⓘ Pyrrhotite | Fe1-xS |
K | Potassium | |
K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
Ca | Calcium | |
Ca | ⓘ Calcite | CaCO3 |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Pyrite | FeS2 |
Fe | ⓘ Pyrrhotite | Fe1-xS |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
Link to USGS - Alaska: | MH262 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Windy-McKinley DomainDomain
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