Unnamed Occurrence (ARDF - ID024; east of lower Spaulding Creek), Innoko Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - ID024; east of lower Spaulding Creek) | - not defined - |
| Innoko Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
62° 56' 4'' North , 156° 30' 46'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is on a northeast-trending ridge east of Spaulding Creek, at an elevation of 550 meters. It is in the NE1/4 SE1/4, section 20, T. 33 N., R. 38 W., of the Seward Meridian. The location is accurate (T.K. Bundtzen, unpub. field data, 1979).
Geology: This occurrence is in a N60E-trending, mafic to intermediate dike or sill about 30 feet thick. The dike or sill intrudes the shale and sandstone of the Upper Cretaceous, Kuskokwim Group. The dike has been extensively altered to silica-carbonate rock in breccia zones up to 10 feet wide at the contacts of the dike and the sedimentary rocks. Shear zones in adjacent sandstone are pyritized (Bundtzen and Laird, 1982; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). A grab sample of mineralized dike contained 0.16 ounce of silver per ton, 1,000 parts per million chromium, and 150 parts per billion gold (Bundtzen and Laird, 1982; Miller, Bundtzen, and Gray, 2005). A highly brecciated felsic dike thought to be an extension of the breccia unit at the Katz prospect (ID028) is exposed about 65 feet west of this occurrence.
Workings: Three prospect pits about 50 feet apart expose the altered dike.
Age: Undated; probably Late Cretaceous based on nearby dated intrusions along Ganes-Yankee Creek fault (Bundtzen and Miller, 1997).
Alteration: Extensive silica-carbonate alteration of a intermediate to mafic dike; sericitic alteration in felsic dike.
Commodities (Major) - Ag; (Minor) - Au, Cr
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
2 valid minerals.
Detailed Mineral List:
| ⓘ 'Clay minerals' |
| ⓘ Magnesiochromite Formula: MgCr2O4 |
| ⓘ Pyrite Formula: FeS2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Magnesiochromite | 4.BB.05 | MgCr2O4 |
| Unclassified | |||
| ⓘ | 'Clay minerals' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Magnesiochromite | MgCr2O4 |
| Mg | Magnesium | |
| Mg | ⓘ Magnesiochromite | MgCr2O4 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Cr | Chromium | |
| Cr | ⓘ Magnesiochromite | MgCr2O4 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS - Alaska: | ID024 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Angayucham TerraneAccretionary Complex
- Farewell buried DomainDomain
This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
