Unnamed Occurrence (ARDF - PA035; near Redfish Bay), Chichagof Mining District (Chicagof Mining District), Sitka, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - PA035; near Redfish Bay) | - not defined - |
| Chichagof Mining District (Chicagof Mining District) | Mining District |
| Sitka | City Borough |
| Alaska | State |
| USA | Country |
This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84):
56° 21' 27'' North , 134° 52' 51'' West
Latitude & Longitude (decimal):
Köppen climate type:
MAS number: 0021160021.
Location: This occurrences is a pegmatite about 600 feet in diameter that is about 1.0 mile west of the head of Redfish Bay near the middle of the south boundary of section 36, T. 63 S., R. 67 E. The location is accurate.
Geology: As described by Sainsbury (1957), this occurrence consists of a circular body of pegmatite about 600 feet in diameter. The pegmatite is in a large composite intrusive body near the contact of monzonite or granite and quartz diorite. Loney and others (1975) map the body as tonalite and granodiorite of Tertiary age. Detailed mapping by Sainsbury indicates that the pegmatite consists of two or more dikelike phases. The pegmatite is zoned with a core of quartz surrounded by a shell of variable mineralogy that includes areas of perthite, quartz, and graphic granite; microcline-perthite; and perthite, mica, and quartz. A border zone is generally quartz and graphic granite. The chief commodity of interest is microcline-perthite that occurs in zones 4 to 10 feet thick; the largest zone is at least 120 feet long and 6 to 8 feet thick. There is some optical-grade quartz. Sainsbury tentatively identified a few grains of cassiterite, but there is no indication of beryllium, columbium, or tantalum minerals. The pegmatite is not radioactive.
Workings: Probably none beyond surface examination and sampling by the U.S. Geological Survey and U.S. Bureau of Mines.
Age: The pegmatite is in a large Tertiary granitic intrusion and is probably the same age.
Reserves: None.
Commodities (Major) - Microcline-perthite, quartz? ; (Minor) - Sn?
Development Status: None
Deposit Model: Pegmatite.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ 'Feldspar Group' |
| ⓘ 'Mica Group' |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Unclassified | |||
| ⓘ | 'Feldspar Group' | - | |
| ⓘ | 'Mica Group' | - | |
Other Databases
| Link to USGS - Alaska: | PA035 |
|---|
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.
