Rock Creek Prospect (Corundum), Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Rock Creek Prospect (Corundum) | Prospect |
| Chistochina Mining District | Mining District |
| Valdez-Cordova Census Area | Census Area |
| Alaska | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
62° 35' 47'' North , 143° 20' 45'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Mentasta Lake | 112 (2011) | 42.0km |
The prospect is in the Wrangell-St. Elias National Preserve.
Location: This prospect is on the ridge between Rock Creek and Little Jack Creek. It is at an elevation of about 5,500 feet, 2,000 feet south-southwest of peak 6315, and 4,000 feet north-northeast of peak 5270. The site is close to the center of the north boundary of section 4, T. 9 N., R. 11 E. of the Copper River Meridian. This is locality 5 of Richter and Schmoll (1973), locality 7 of Richter and others (1975), and National Park Service locality WRST-6 (unpublished data). Cobb and Richter (1980) included this prospect under the name 'Rock Cr.'. It is located to within a few hundred feet.
Geology: Gray to blue-gray corundum occurs in aggregates associated with muscovite books in small and discontinuous alkali pegmatite dikes generally less than 3 feet wide. Some of the corundum crystals are up to 8 cm long but they commonly have a fractured habit and abundant feldspar inclusions (Richter, 1970; Richter and others, 1975). The host rock for the pegmatite dikes is peraluminous syenite-monzonite gneiss in a meta-igneous complex that has Early Jurassic K/Ar ages (Richter, Lanphere, and Matson, 1975).
Workings: There has been some surface prospecting of this deposit.
Age: Early Jurassic K/Ar dates indicate an Early Jurassic or older age for the host intrusive complex (Richter. Lanphere, and Matson, 1975).
Commodities (Major) - Sapphire
Development Status: Yes; small
Deposit Model: Corundum in pegmatite dike
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.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Corundum | 4.CB.05 | Al2O3 |
Other Databases
| Link to USGS - Alaska: | NB011 |
|---|
Other Regions, Features and Areas containing this locality
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.
