Tyee Prospect, Ketchikan Mining District, Ketchikan Gateway Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Tyee Prospect | Prospect |
| Ketchikan Mining District | Mining District |
| Ketchikan Gateway Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
55° 23' 20'' North , 131° 10' 58'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Saxman | 417 (2017) | 27.3km |
| Ketchikan | 8,197 (2017) | 29.8km |
| Metlakatla | 1,405 (2017) | 38.1km |
Location: The Tyee prospect is at an elevation of about 250 feet, on the north bank of the creek just below the outlet of Granite Lake. The site is in section 6, T. 77 S., R. 94 E., of the Copper River Meridian. It corresponds to loc. 85 in Elliott and others (1978), and to loc. 297 in Maas and others (1995). The location is accurate within 0.1 miles.
Geology: The country rocks in this part of Revillagigedo Island are marine, interbedded, andesitic and basaltic metavolcanic rocks and subordinate pelitic metasedimentary rocks that are intruded by stocks, sills, and dikes of Cretaceous feldspar-porphyritic granodiorite (Berg and others, 1988).
The strata and some of the granodiorite were regionally metamorphosed to greenschist grade in Late Cretaceous time.
These regionally metamorphosed rocks subsequently were locally remetamorphosed to hornblende hornfels near the contacts of Cretaceous granodiorite plutons that were emplaced after the regional metamorphism.
The premetamorphic age of the strata is uncertain.
Berg and others (1988) assign them a Mesozoic or (late) Paleozoic age.
Berg (1982) and Crawford and others (2000) assign them to the Gravina belt, of Late Jurassic or Cretaceous age, or to the Taku terrane, of late Paleozoic to Late Triassic age.
The metamorphic and intrusive rocks locally are overlain by basalt and andesite lava flows of Quaternary or Tertiary age.
The Tyee deposit consists of a four-foot-wide quartz fissure vein in granodiorite (Wright and Wright, 1908, p. 148).
The vein strikes east and dips 78°S, and contains small amounts of pyrite, sphalerite, and galena, accompanied by low values in gold.
According to Maas and others (1995, p. 215), the quartz in the veins is not recrystallized, so the veins probably are younger than most or all of the Late Cretaceous regional metamorphism.
Age: Late Cretaceous or younger.
Commodities (Major) - Au, Pb, Zn
Development Status: None
Deposit Model: Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
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
5 valid minerals.
Detailed Mineral List:
| ⓘ Galena Formula: PbS Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225. |
| ⓘ Gold Formula: Au Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225. |
| ⓘ Pyrite Formula: FeS2 Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225. |
| ⓘ Quartz Formula: SiO2 Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225. |
| ⓘ Sphalerite Formula: ZnS Reference: U.S. Geological Survey, 2008, Alaska Resource Data File (ARDF): U.S. Geological Survey Open-File Report 2008-1225. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| 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 | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)Wright, F.E., Wright, C.W. (1908) The Ketchikan and Wrangell mining districts, Alaska. U.S. Geological Survey Bulletin 347, 210 pages.
Elliott, R.L., Berg, H.C., Karl, S.M. (1978) Map and table describing metalliferous and selected non-metalliferous mineral deposits in the Ketchikan and Prince Rupert quadrangles, Alaska. U.S. Geological Survey Open-File Report 78-73B, 17 pages, 1 sheet, scale 1:250,000.
Berg, H.C. (1982) The Alaska Mineral Resource Assessment Program; guide to information about the geology and mineral resources of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska. U.S. Geological Survey Circular 855, 24 pages.
Berg, H.C., Elliott, R.L., Koch, R.D. (1988) Geologic map of the Ketchikan and Prince Rupert quadrangles, southeastern Alaska. U.S. Geological Survey Mineral Investigations Series Map I-1807, 27 pages, scale 1:250,000.
Maas, K.M., Bittenbender, P.E., Still, J.C. (1995) Mineral investigations in the Ketchikan mining district, southeastern Alaska. U.S. Bureau of Mines Open-File Report 11-95, 606 pages.
Other Databases
| Link to USGS - Alaska: | KC088 |
|---|
External Links
https://pubs.er.usgs.gov/publication/b347 [Wright & Wright, 1908]
https://dggs.alaska.gov/pubs/id/12447 [Elliott et al., 1978]
https://dggs.alaska.gov/pubs/id/13458 [Berg, 1982]
https://dggs.alaska.gov/pubs/id/12925 [Berg et al., 1988]
https://dggs.alaska.gov/pubs/id/21340 [Maas et al., 1995]
https://dggs.alaska.gov/pubs/id/12447 [Elliott et al., 1978]
https://dggs.alaska.gov/pubs/id/13458 [Berg, 1982]
https://dggs.alaska.gov/pubs/id/12925 [Berg et al., 1988]
https://dggs.alaska.gov/pubs/id/21340 [Maas et al., 1995]
Other Regions, Features and Areas containing this locality
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