Unnamed Occurrence (ARDF - MH215; southwest flank of Rainbow Ridge), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 18' 58'' North , 145° 40' 22'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an elevation of 4,250 feet on the southwest flank of Rainbow Ridge about 1.2 miles west-northwest of the top of Rainbow Mountain. It is in the NE1/4NE1/4 section 32, T. 18 S., R. 11 E., Fairbanks Meridian. This site corresponds to locality 5 in Hanson (1963), locality 20 of Cobb (1979 [OFR 79-238]), and locality S108 in table 2 of Nokelberg and others (1991).
Geology: At this location chalcopyrite and galena occur in quartz veins 6 or more inches thick that strike N5W and dip 70 to 80W (Hanson, 1963). The veins form a subparallel set that cuts tuffaceous sedimentary rocks of the Slana Spur Formation of Pennsylvanian age near a Permian dacite hypabyssal intrusion (Nokleberg and others, 1991). Hanson (1963) collected samples that assayed 3.99 percent copper, 0.02 ounce of gold per ton, and 1.4 ounces of silver per ton.
Workings: Hanson (1963) collected samples that assayed 3.99 percent copper, 0.02 ounce of gold, and 1.4 ounces of silver per ton. The occurrence is on active claims of Northeast Exploration.
Age: Probably Permian.
Commodities (Major) - Ag, Cu; (Minor) - Au, Pb
Development Status: None
Deposit Model: Polymetallic veins; Porphyry Cu (Cox and Singer, 1986; model 22c, model 17).
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.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | MH215 |
|---|
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