Unnamed Occurrence (ARDF - MH068; upper west headwaters of the Maclaren River), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 13' 1'' North , 146° 40' 58'' West
Latitude & Longitude (decimal):
KΓΆppen climate type:
Mindat Locality ID:
201201
Long-form identifier:
mindat:1:2:201201:1
GUID (UUID V4):
b19049a0-4558-4940-8bd4-4c088ce97088
Location: This occurrence is at an elevation of about 4,600 feet in the headwaters of a west tributary of the Maclaren River. The occurrence is in the NW1/4NW1/4 section 6, T. 20 S., R. 6 E., Fairbanks Meridian. The occurrence corresponds to locality 19 in figure 4 of Cobb (1979 [OFR 79-238]) and to locality 27 in table 2 of Nokleberg and others (1991).
Geology: The rock at this occurrence is propylitized metabasalt of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991). The deposit consists of bornite, chalcocite, and malachite in quartz-epidote veinlets, in vesicles, and on fracture or joint surfaces in metabasalt (Saunders, 1961 [report for the year]; Smith and others, 1973). No assays are available, but small quantities of silver commonly occur in copper deposits in the Nikolai Greenstone.
Workings: The deposit was found during regional mapping and sampling; there are no workings.
Age: The deposit is probably Cretaceous or early Tertiary in age (see MH060 and MH100).
Alteration: Propylitic alteration of basalt.
Commodities (Major) - Cu; (Minor) - Ag
Development Status: None
Deposit Model: Basaltic Cu (Cox and Singer, 1986; model 23).
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:
β Bornite Formula: Cu5FeS4 |
β Chalcocite Formula: Cu2S |
β Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
β Malachite Formula: Cu2(CO3)(OH)2 |
β Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
β | Chalcocite | 2.BA.05 | Cu2S |
β | Bornite | 2.BA.15 | Cu5FeS4 |
Group 4 - Oxides and Hydroxides | |||
β | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
β | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
Group 9 - Silicates | |||
β | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
H | β Malachite | Cu2(CO3)(OH)2 |
C | Carbon | |
C | β Malachite | Cu2(CO3)(OH)2 |
O | Oxygen | |
O | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
O | β Malachite | Cu2(CO3)(OH)2 |
O | β Quartz | SiO2 |
Al | Aluminium | |
Al | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | Silicon | |
Si | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | β Quartz | SiO2 |
S | Sulfur | |
S | β Bornite | Cu5FeS4 |
S | β Chalcocite | Cu2S |
Ca | Calcium | |
Ca | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Fe | Iron | |
Fe | β Bornite | Cu5FeS4 |
Fe | β Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Cu | Copper | |
Cu | β Bornite | Cu5FeS4 |
Cu | β Chalcocite | Cu2S |
Cu | β Malachite | Cu2(CO3)(OH)2 |
Other Databases
Link to USGS - Alaska: | MH068 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Wrangellia DomainDomain
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