Tyee Prospect, Ketchikan Gateway Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Tyee Prospect | Prospect |
| 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):
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 |
| ⓘ Native Gold Formula: Au |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| 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 | ⓘ Native Gold | Au |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | KC088 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Taku DomainDomain
- Yukon-TananaVolcanic Arc
USA
- Alaska
- Ketchikan Mining DistrictMining District
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