Unnamed Occurrence (ARDF - MH271; near the glacier at the head of the West Fork Chistochina River), Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
63° 11' 4'' North , 144° 58' 22'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201297
Long-form identifier:
mindat:1:2:201297:4
GUID (UUID V4):
8fc4e8d2-335a-4988-8e70-f790d680e3ff
Location: This occurrence is southeast of the terminus of the glacier at the the head of West Fork Chistochina River and at an elevation of about 4,100 feet. It is in the W1/2NE1/4 section 13, T. 20 S., R. 14 E., Fairbanks Meridian. The occurrence corresponds to locality 9 on figure 1 of Rose (1967) and locality 2 on figure 6 of Cobb (1979 [OFR 79-238]). The location is probably accurate within 1,000 feet.
Geology: The rocks near this site are andesite of the Slana Spur Formation of Pennsylvanian to Permian age (Richter and Dutro, 1975). The andesite is intruded by Mesozoic (?) quartz monzonite and is partly replaced by pods as much as 5 feet wide that have abundant chalcopyrite, pyrite, and magnetite in a gangue of quartz, epidote, chlorite, and an unspecified carbonate mineral (Rose, 1967). Rose found a boulder near the site that contained rhodonite, rhodochrosite, and quartz but could not determine if it was locally derived or transported.
Workings: The natural exposure of mineralized andesite is in an abandoned stream channel; the occurrence was not found during the investigations of I.M. Lange and W.J. Nokleberg in 1979 and 1980.
Age: Possibly Mesozoic, on the basis of the association with a quartz monzonite pluton of that age.
Alteration: Replacement of andesite by masses of skarn-like pyrite-chalcopyrite-magnetite accompanied by chlorite, epidote, quartz, and a carbonate mineral.
Commodities (Major) - Cu; (Minor) - Fe, Mn
Development Status: None
Deposit Model: Cu skarn (Cox and Singer, 1986; model 18b).
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
7 valid minerals.
Detailed Mineral List:
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ 'Chlorite Group' |
ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
ⓘ Pyrite Formula: FeS2 |
ⓘ Quartz Formula: SiO2 |
ⓘ Rhodochrosite Formula: MnCO3 |
ⓘ Rhodonite Formula: CaMn3Mn[Si5O15] |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
ⓘ | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
ⓘ | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
ⓘ | Rhodochrosite | 5.AB.05 | MnCO3 |
Group 9 - Silicates | |||
ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
ⓘ | Rhodonite | 9.DK.05 | CaMn3Mn[Si5O15] |
Unclassified | |||
ⓘ | 'Chlorite Group' | - |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
C | Carbon | |
C | ⓘ Rhodochrosite | MnCO3 |
O | Oxygen | |
O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
O | ⓘ Magnetite | Fe2+Fe23+O4 |
O | ⓘ Quartz | SiO2 |
O | ⓘ Rhodochrosite | MnCO3 |
O | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
Al | Aluminium | |
Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | Silicon | |
Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | ⓘ Quartz | SiO2 |
Si | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
S | Sulfur | |
S | ⓘ Chalcopyrite | CuFeS2 |
S | ⓘ Pyrite | FeS2 |
Ca | Calcium | |
Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Ca | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
Mn | Manganese | |
Mn | ⓘ Rhodochrosite | MnCO3 |
Mn | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Fe | ⓘ Pyrite | FeS2 |
Cu | Copper | |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
Link to USGS - Alaska: | MH271 |
---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Wrangellia DomainDomain
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.