Unnamed Occurrence (ARDF - IL028; southeast of Upper Copper Lake), Bristol Bay Mining District, Lake and Peninsula Borough, Alaska, USAi
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Latitude & Longitude (WGS84):
59° 35' 21'' North , 154° 5' 45'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
200928
Long-form identifier:
mindat:1:2:200928:8
GUID (UUID V4):
f205bd4d-5abd-4b7a-b2de-82c7aec888f6
Location: This occurrence is at an elevation of about 1,000 feet on the north slope of the divide between Upper Copper Lake and Boot Lake. It is about in the center of the S1/2 NE1/4 sec. 7, T. 7 S., R. 28 W., Seward Meridian. The location is accurate within about 0.5 mile. The site is locality 13 of Detterman and Cobb (1972).
Geology: This occurrence is near the contact between granitic plutons of Tertiary and Cretaceous or Tertiary age (Read, 1967; Detterman and Reed, 1980). It consists of pyritized, argillized, and sericitized(?) granitic intrusive rock in a 400-foot-long exposure along a fault-controlled, unnamed northerly-flowing stream. The granitic rocks are cut by a mafic dike. The altered rocks contain disseminated flakes of molybdenite. Copper and molybdenum occur in anomalous concentrations in stream-sediment samples collected below the occurrence (Reed,1967), suggesting that the occurrence also contains chalcopyrite. Reed's rock samples, however, did not detect the gold reported by Detterman and Cobb (1972). The fault that controls the exposure may be a splay of a shear zone extending northeastward through the Meadow Lake valley (Reed, 1967).
Workings: Exploration consists of reconnaissance geologic mapping and rock and stream-sediment sampling. Reed's (1967) stream-sediment samples were anomalous for copper and molybdenum, but his rock samples did not detect the gold reported by Detterman and Cobb (1972).
Age: Probably Tertiary.
Alteration: Pyritization and argillic and sericitic(?) alteration.
Commodities (Major) - Au?, Mo; (Minor) - Cu?
Development Status: None
Deposit Model: Porphyry Cu-Mo (Cox and Singer, 1986; model 21a).
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Chalcopyrite ? Formula: CuFeS2 |
| ⓘ Molybdenite Formula: MoS2 |
| ⓘ Pyrite Formula: FeS2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite ? | 2.CB.10a | CuFeS2 |
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Molybdenite | MoS2 |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
Other Databases
| Link to USGS - Alaska: | IL028 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
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References
