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Unnamed Occurrences (ARDF - JU220; northwest of Pt. Couverden), Haines, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrences (ARDF - JU220; northwest of Pt. Couverden) | - not defined - |
| Haines | City Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
58° 14' 55'' North , 135° 15' 57'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Hoonah | 757 (2017) | 18.6km |
| Gustavus | 434 (2017) | 33.0km |
| Tenakee Springs | 133 (2017) | 52.1km |
Location: This site is the approximate center of numerous occurrences centered approximately 5 miles north of Sisters Island and 8 miles west-northwest of Point Couverden. The site is plotted somewhat arbitrarily near the north end of the boundary between sections 9 and 10, T. 42 S., R. 62 E. of the Copper River Meridian. The location is accurate within 1 mile.
Geology: The host rocks of these occurrences are mainly lower Paleozoic, black, carbonaceous limestone and subordinate interbedded argillite (Clough and Redman, 1989). These rocks are intruded by equigranular to slightly porphyritic andesite dikes. The deposits consist of thin, quartz-calcite veins that cut the sedimentary rocks and locally contain pyrite, galena, sphalerite, and chalcopyrite. Several fault zones up to 2 miles along, are marked by elevated metal values (Clough and Redman, 1989). U.S. Bureau of Mines samples of fault gouge contained up to 30 ppm silver, 0.7 ppm gold, 9,200 ppm zinc, 4,070 ppm lead, and 210 ppm copper. Their samples of quartz-calcite veins contained up to 1.2 ppm gold, 1,500 ppm copper, 7,500 ppm lead, and 3,800 ppm zinc. They also noted anomalous gold values in samples of black argillite. Salisbury and Associates explored for massive sulfide deposits in the area in the late 1980's (Clough and Redman, 1989). The rocks in the general area are deformed and metamorphosed Silurian or Devonian carbonate, clastic, and volcaniclastic rocks that have been intruded by Upper Jurassic and Lower Cretaceous granitic and dioritic rocks (Brew and others, 1992). The rocks immediately west of the occurrence are metamorphosed Silurian and Devonian graywacke and argillite that have been intruded by foliated Cretaceous granitic rocks (Brew and others, 1978).
Workings: Surface sampling only.
Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: None
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:
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Galena Formula: PbS |
| ⓘ 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 |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Calcite | CaCO3 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | JU220 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
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