Unnamed Occurrence (ARDF - MH090; south of East Fork Maclaren River), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 15' 41'' North , 146° 30' 0'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201208
Long-form identifier:
mindat:1:2:201208:0
GUID (UUID V4):
cedd348f-e656-4297-aef4-14a902efa3b3
Location: The occurrence is approximately located at an elevation of about 3,100 feet, one-half mile south of lowermost East Fork Maclaren River. The location is essentially on the boundary between the Mount Hayes B-5 and B-6 quadrangles. The location corresponds to locality 35 in table 2 of Nokleberg and others (1991). Nokleberg and others (1991), however, reported the latitude of the occurrence as 145o 29' 09, which would definitely place the occurrence on the B-5 quadrangle. The location is uncertain by a mile or so.
Geology: The host rock of this occurrence is metabasalt of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991). The deposit consists of metabasalt cut by quartz veins containing azurite and malachite, secondary minerals after unknown primary copper minerals. Grab sample 79RM028C containing azurite and malachite assayed 1.5 percent copper (Nokleberg and others, 1991). Copper deposits of the Nikolai Greenstone typically contain small amounts of silver.
Workings: The occurrence is covered by active MAN Resources claims (W.T. Ellis, written communication, 2001).
Age: The deposit is probably Cretaceous or early Tertiary (see MH060 and MH100).
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
3 valid minerals.
Detailed Mineral List:
ⓘ Azurite Formula: Cu3(CO3)2(OH)2 |
ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 4 - Oxides and Hydroxides | |||
---|---|---|---|
ⓘ | 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 |
List of minerals for each chemical element
H | Hydrogen | |
---|---|---|
H | ⓘ Azurite | Cu3(CO3)2(OH)2 |
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 | ⓘ Malachite | Cu2(CO3)(OH)2 |
O | ⓘ Quartz | SiO2 |
Si | Silicon | |
Si | ⓘ Quartz | SiO2 |
Cu | Copper | |
Cu | ⓘ Azurite | Cu3(CO3)2(OH)2 |
Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
Other Databases
Link to USGS - Alaska: | MH090 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Wrangellia DomainDomain
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