Unnamed Occurrence (ARDF - ID148; near hill 2380 south of summit of Granite Mountain), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
62° 18' 2'' North , 156° 42' 50'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is about 650 feet east of hill 2380 on a southern side of Granite Mountain. The occurrence is at an elevation of about 2,100 feet, about 0.4 mile west of the center of section 33, T. 26 N., R. 40 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence is a irregular zone of tourmaline-rich quartz monzonite in the border phase of the 62.6 Ma, Granite Mountain pluton (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The size and orientation of the mineralized body is uncertain. One grab sample contained 1,500 parts per billion (ppb) silver, 200 parts per million (ppm) lead, 15 ppm tin, 12 ppm antimony, and more than 2,000 ppm boron McGimsey and others, 1988).
Workings: Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in 1984 (McGimsey and others, 1988).
Age: Unknown; possibly related to the nearby Granite Mountain pluton that has a 40K/40Ar age of 62.6 Ma (Miller and Bundtzen, 1994).
Alteration: Tourmaline in quartz monzonite.
Commodities (Major) - Ag, Pb; (Minor) - B, Sb, Sn
Development Status: None
Deposit Model: Sn-polymetallic deposit (Cox and Singer, 1986; model 20b).
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
Detailed Mineral List:
| ⓘ 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Unclassified | |||
|---|---|---|---|
| ⓘ | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
List of minerals for each chemical element
| B | Boron | |
|---|---|---|
| B | ⓘ Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
| O | Oxygen | |
| O | ⓘ Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
Other Databases
| Link to USGS - Alaska: | ID148 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Farewell TerranePassive Margin
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