Mystery Mountains East Prospect, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Mystery Mountains East Prospect | Prospect |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 31' 26'' North , 154° 33' 36'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
See Copenhagen Hill (MD030), Frozen Creek (MD032), Tarn (MD027), and Pork Chop (MD031) prospects.
Location: The Mystery Mountains East prospect is situated on a steep southerly flank of a southwest facing valley about 2 miles (3.2 km) north of Cottonwood Creek at an elevation of 3,400 feet (1,036 m) in Section 2, T. 23 S., R. 22 E., of the Kateel River Meridian. Location is accurate to within 500 feet (152 m).
Geology: The Mystery Mountains East prospect is one of a number of porphyry-like copper-gold prospects that occur along a seven mile (11 km) long, northeast trending belt through the central Mystery Mountains. Mineralization consists of tourmaline quartz veins, breccia veins, and fractures associated with small monzonite and quartz porphyry bodies hosted in biotite hornfels (DiMarchi and others, 1997). Sulfides include arsenopyrite, chalcopyrite, pyrite, and traces of stibnite, within a 600 feet by 600 feet (183 m by 183 m) area. The Mystery Mountain East prospect is inferred to be Late Cretaceous, based on isotopic ages from Mystery Mountains plutonic rocks (Moll and others, 1981). Surface grab samples from the Mystery Mountains East prospect ran as high as 830 ppm arsenic, 203 ppm copper, 2.0 ppm silver, but contained no gold (DiMarchi and others, 1997).
Workings: WGM Inc. located a number of porphyry-like prospects in the Mystery Mountains during the late 1970s (Andrews, 1978). From 1988 to 1990, ACNC conducted detailed exploration work, which included an airborne geophysical survey. ASA Inc. continued work from 1991 to 1997. Surface grab samples from the Mystery Mountains East prospect ran as high as 830 ppm arsenic, 203 ppm copper, 2.0 ppm silver, but contained no gold (DiMarchi and others, 1997).
Age: The Mystery Mountain East prospect is inferred to be Late Cretaceous, based on isotopic ages from Mystery Mountains plutonic rocks (Moll and others, 1981).
Alteration: Biotite, tourmaline, and quartz.
Reserves: None.
Commodities (Major) - Cu; (Minor) - Ag, As, Sb
Development Status: No
Deposit Model: Porphyry Cu-Au (Cox and Singer, 1986; model no. 20c)
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
4 valid minerals.
Detailed Mineral List:
| ⓘ Arsenopyrite Formula: FeAsS |
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ 'Tourmaline' Formula: AD3G6 (T6O18)(BO3)3X3Z |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Unclassified | |||
| ⓘ | '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 |
| S | Sulfur | |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
Other Databases
| Link to USGS - Alaska: | MD028 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
- Farewell TerranePassive Margin
USA
- Alaska
- Yukon-Koyukuk Census Area
- McGrath Mining DistrictMining District
- Yukon-Koyukuk Census Area
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