Unnamed Occurrence (ARDF - ID121; north of Discovery Camp), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - ID121; north of Discovery Camp) | - not defined - |
| Iditarod Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 29' 18'' North , 157° 54' 0'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at the top of a prominent, north-trending peak about 2.7 mile north-northeast of Discovery Camp on Otter Creek. The occurrence is at an elevation of about 2,200 feet and about 0.3 mile east of the center of section 25, T. 28 N., R. 47 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence consists of iron-oxide-stained rubble of a quartz vein of unknown extent. The vein is in an aureole of hornfels that overlies an intrusion exposed to the west at the Golden Ground prospect (ID116). The mineralized rubble also contains fragments of brecciated, hornfelsed sandstone with tourmaline rosettes (Bundtzen and others, 1992; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). The prospect was developed by one trench that is now sloughed and overgrown. Grab samples of mineralized rubble contain up to 1,000 parts per billion (ppb) gold, 1,000 ppb silver, 650 parts per million (ppm) antimony, more than 2,000 ppm arsenic, 2,000 ppm boron, 50 ppm tungsten, and more than 10.0 ppm mercury (McGimsey and others, 1988). The high boron value probably reflects the presence of tourmaline.
Workings: A trench cut prior to 1986 explored the mineralized area. The area was sampled by the U.S. Geological Survey in 1986 (McGimsey and others, 1988; Bundtzen and others, 1992).
Age: Undated; probably related to a nearby intrusion that is 70.6 Ma (Bundtzen and others, 1992).
Alteration: Tourmaline-mica greisen is developed in the hornfels.
Commodities (Major) - Au; (Minor) - Ag, As, Hg, Sb, W
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
1 valid mineral.
Detailed Mineral List:
| ⓘ 'Limonite' |
| ⓘ Quartz Formula: SiO2 |
| ⓘ 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
| ⓘ | 'Tourmaline' | - | AD3G6 (T6O18)(BO3)3X3Z |
List of minerals for each chemical element
| B | Boron | |
|---|---|---|
| B | ⓘ Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
| O | Oxygen | |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Tourmaline | AD3G6 (T6O18)(BO3)3X3Z |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
Other Databases
| Link to USGS - Alaska: | ID121 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Angayucham TerraneAccretionary Complex
- Farewell buried DomainDomain
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