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Miss Molly Prospect, Yentna Mining District, Matanuska-Susitna Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Miss Molly Prospect | Prospect |
| Yentna Mining District | Mining District |
| Matanuska-Susitna Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 43' 47'' North , 152° 4' 12'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
The Miss Molly prospect is not a classic stockwork molybdenum- type occurrence.
Location: Fernette and Cleveland (1984) locate the Miss Molly prospect on the north side of the Trimble River near the toe of the Trimble Glacier in Section 18, T. 19 N., R. 15 W. The area is mostly covered by glacial debris and dense vegetation, with good bedrock exposures along the Trimble River and in stream valleys (U.S. Bureau of Mines, 1998, MAS # 0020840031 and U.S. Bureau of Mines, 1973, localites 26 and 46). Location is known to within 100 yards.
Geology: Fernette and Cleveland (1984) described the mineralization at Miss Molly as quartz veins with medium to coarse-grained molybdenite, pyrite, and local fluorite. Veins are regularly spaced, sub parallel, vary from 2 to 10 cm wide, and are spaced 2 to 10 m apart. Veins occur in two zones about 545 m long and up to 150 m wide in a leucocratic, equigranular biotite granite stock. Veins locally fill joints and less commonly shears. Hydrothermal alteration up to 0.3 m wide to sericite and pyrite, occurs adjacent to veins. Grab and chip samples contain up to 0.38% Mo, 0.16% Zn and 100 ppb Au. The granite stock intrudes Mesozoic marine sediments (KJs) of the Kahlitna terrane (Fernette and Cleveland, 1984 and Nokleberg and others, 1987). Reed and Lanphere (1972) report nearby granitic plutons with K-Ar ages of 56-59 m.y. and is probably the same age as the intrusion hosting the veins.
Workings: Exploration work included prospecting, rock chip geochemical sampling.
Age: Possibly related to dated Tertiary (59 - 56 m.y.) intrusions nearby. (Reed and Lanphere, 1972)
Alteration: Quartz, sericite, clay, alunite? (Fernette and Cleveland, 1984).
Reserves: Moderate size and grade (Fernette and Cleveland, 1984).
Commodities (Major) - Mo, Pb, Zn; (Minor) - F
Development Status: No
Deposit Model: Mo-bearing quartz veins
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:
| ⓘ Fluorite Formula: CaF2 |
| ⓘ Galena Formula: PbS |
| ⓘ Molybdenite Formula: MoS2 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 3 - Halides | |||
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| F | Fluorine | |
| F | ⓘ Fluorite | CaF2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Galena | PbS |
| S | ⓘ Molybdenite | MoS2 |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Ca | Calcium | |
| Ca | ⓘ Fluorite | CaF2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | TY013 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Peninsular TerraneVolcanic Arc
- Wrangellia DomainVolcanic Arc
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