Unnamed Occurrence (ARDF - MH066; east of West Fork Maclaren River), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 13' 27'' North , 146° 42' 46'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201200
Long-form identifier:
mindat:1:2:201200:4
GUID (UUID V4):
d0ee53aa-ccfe-457c-910b-b8c3cd9e39ba
Kaufman (1964) noted the mineralized skarn float may have traveled a considerable distance downstream, a conclusion borne out with the discovery of the Zackly prospect (MH067) in 1979 by Resource Associates of Alaska.
Location: This occurrence is at an elevation of about 4,000 feet in a west-flowing tributary to the West Fork Maclaren River, in the NW1/4SW1/4 section 36, T. 19 S., R. 5 E., Fairbanks Meridian. The site corresponds to locality 11 of Kaufman (1964), locality 18 in figure 4 of Cobb (1979 [OFR 79-238]), and locality 25 in table 2 of Nokleberg and others (1991).
Geology: The rock near this prospect is propylitized metabasalt of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991). Some probably Cretaceous granitic material is exposed at the site. Copper minerals are found in place and in float at the site. Kaufman (1964, p. 7, occurrence 11) speculated that the source of float minerals is probably a considerable distance upstream. Chalcopyrite occurs in place in stringers in greenstone and intrusive material at the site of the occurrence. Float found in the creek bed at the 4,000-foot elevation consists of banded chalcopyrite-magnetite skarn and banded azurite-malachite.
Workings: Bedrock and float mineral specimens were found during geologic mapping (Kaufman, 1964). The source of float almost certainly is the Zackly skarn deposit (MH067).
Age: Uncertain. The banded chalcopyrite-magnetite skarn float is almost certainly derived from the Cretaceous Zackly skarn deposit (MH067), discovered in 1979.
Commodities (Major) - Cu
Development Status: None
Deposit Model: Basaltic Cu (?) (Cox and Singer, 1986; model 23); Cu skarn in float material (C
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:
ⓘ Azurite Formula: Cu3(CO3)2(OH)2 |
ⓘ Chalcopyrite Formula: CuFeS2 |
ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
ⓘ | Quartz | 4.DA.05 | SiO2 |
Group 5 - Nitrates and Carbonates | |||
ⓘ | Azurite | 5.BA.05 | Cu3(CO3)2(OH)2 |
ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
Group 9 - Silicates | |||
ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Azurite | Cu3(CO3)2(OH)2 |
H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
H | ⓘ Malachite | Cu2(CO3)(OH)2 |
C | Carbon | |
C | ⓘ Azurite | Cu3(CO3)2(OH)2 |
C | ⓘ Malachite | Cu2(CO3)(OH)2 |
O | Oxygen | |
O | ⓘ Azurite | Cu3(CO3)2(OH)2 |
O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
O | ⓘ Magnetite | Fe2+Fe23+O4 |
O | ⓘ Malachite | Cu2(CO3)(OH)2 |
O | ⓘ Quartz | SiO2 |
Al | Aluminium | |
Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | Silicon | |
Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Si | ⓘ Quartz | SiO2 |
S | Sulfur | |
S | ⓘ Chalcopyrite | CuFeS2 |
Ca | Calcium | |
Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Fe | Iron | |
Fe | ⓘ Chalcopyrite | CuFeS2 |
Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Cu | Copper | |
Cu | ⓘ Azurite | Cu3(CO3)2(OH)2 |
Cu | ⓘ Chalcopyrite | CuFeS2 |
Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
Link to USGS - Alaska: | MH066 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Wrangellia DomainDomain
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