Unnamed Occurrence (ARDF - MH058; west side of West Fork Maclaren River), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
63° 13' 15'' North , 146° 46' 58'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201197
Long-form identifier:
mindat:1:2:201197:7
GUID (UUID V4):
b849e9a2-9b20-40b4-be5f-637df93d9300
A traverse above the copper-bearing rock slide failed to reveal a source (Kaufman, 1964).
Location: This occurrence is on the west side of the West Fork Maclaren River valley at an elevation of approximately 3,600 feet, in the SE1/4SE1/4 section 33, T. 19 S., R. 5 E., Fairbanks Meridian. The occurrence corresponds to locality 10 of Kaufman (1964) and locality 10 in figure 4 of Cobb (1979 [OFR 79-238]). The location is probably accurate within one-third mile.
Geology: The rock at this occurrence is Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1982, 1991). Copper-bearing float occurs throughout a rock slide at the locality (Kaufman, 1964). The float consists of propylitized greenstone containing copper-rich pods and copper-bearing quartz-epidote-calcite veins that cut the greenstone. The copper minerals bornite and chalcocite and their oxidation products (azurite, chrysocolla, and malachite) were observed at the site. The rocks were not sampled; small amounts of silver typically occur with copper in the Basaltic Cu-type deposits of the area.
Age: Probably Cretaceous or early Tertiary (see MH060).
Alteration: The mineralization is associated with quartz-epidote-calcite veins in propylitized basalt and andesite of the Nikolai Greenstone.
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
8 valid minerals.
Detailed Mineral List:
| ⓘ Azurite Formula: Cu3(CO3)2(OH)2 |
| ⓘ Bornite Formula: Cu5FeS4 |
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Chalcocite Formula: Cu2S |
| ⓘ Chrysocolla Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcocite | 2.BA.05 | Cu2S |
| ⓘ | Bornite | 2.BA.15 | Cu5FeS4 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | 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) |
| ⓘ | Chrysocolla | 9.ED.20 | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| H | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | Carbon | |
| C | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | ⓘ Quartz | SiO2 |
| Al | Aluminium | |
| Al | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | Silicon | |
| Si | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Bornite | Cu5FeS4 |
| S | ⓘ Chalcocite | Cu2S |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | Iron | |
| Fe | ⓘ Bornite | Cu5FeS4 |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Cu | Copper | |
| Cu | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| Cu | ⓘ Bornite | Cu5FeS4 |
| Cu | ⓘ Chalcocite | Cu2S |
| Cu | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
| Link to USGS - Alaska: | MH058 |
|---|
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.
References
