Lindfors Prospect, Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Lindfors Prospect | Prospect |
| Valdez Creek Mining District | Mining District |
| Matanuska-Susitna Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 12' 28'' North , 149° 39' 10'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: The Lindfors prospect is at an elevation of about 3,900 feet on the divide at the head of Bryn Mawr Creek. It is in the SE1/4 of sec. 4, T. 20 S., R. 11 W., of the Fairbanks Meridian. The location is accurate to within 500 feet. This is location 11 of Cobb (1978: OFR 78-1062).
Geology: The Lindfors prospect is about 1,500 feet south-southwest of the Golden Zone mine (HE043). The country rocks at the prospect are Permo-Triassic redbed sandstones, conglomerates, limestones and volcanoclastic sediments, which are intruded by Upper Cretaceous quartz diorite dikes. The deposit consists of quartz veins containing arsenopyrite, chalcopyrite, galena, pyrite, sphalerite, and tetrahedrite. Surface geochemistry values of 0.2 to 14 ppm gold, high silver, arsenic, lead, antimony and zinc have been reported (Hawley and Clark, 1974). The Lindfors deposit probably is a continuation of the deposit at the Golden Zone mine.
Workings: One drill hole has explored the Lindfors zone at depth; there is a report of a shallow shaft, now collapsed, dug in the 1920's. Surface exploration consists of numerous pits and trenches. Close-spaced helicopter aeromagnetic and EM geophysical surveys have been flown over this prospect. In 1996, the State of Alaska flew a wider-spaced helicopter aeromagnetic survey that included this prospect (Burns, 1997). Surface geochemistry values of 0.2 to 14 ppm gold, high silver, arsenic, lead, antimony and zinc have been reported (Hawley and Clark, 1974).
Age: Synchronous with the Golden Zone mineralization, dated as Late Cretaceous.
Alteration: Quartz, sericite?, and pyrite.
Commodities (Major) - Au, Cu, Zn; (Minor) - Pb, Sb
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c)
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:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Galena Formula: PbS |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS |
| ⓘ 'Tetrahedrite Subgroup' Formula: Cu6(Cu4C2+2)Sb4S12S |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| ⓘ | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
| 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 | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| S | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
| Sb | Antimony | |
| Sb | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | HE046 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Chulitna-Broad Pass DomainDomain
- Peninsular TerraneVolcanic Arc
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