Unnamed Occurrences (ARDF - PA001; near Goddard Hot Springs), Chichagof Mining District (Chicagof Mining District), Sitka, Alaska, USAi
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Latitude & Longitude (WGS84):
56° 50' 7'' North , 135° 22' 15'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Sitka | 8,863 (2017) | 24.3km |
MAS number: 0021160011.
Location: Several traverses have been made to study the radioactivity in the vicinity of the Goddard Hot Springs (West and Benson, 1955). The springs are at the site of Goddard which is shown on the USGS 1:63,360-scale topographic map. The springs are near the center of the SW1/4 section 17, T. 58 S., R. 63 E. The location is accurate.
Geology: The Goddard Hot Springs have long been known (Knopf, 1912) and there are no known base or precious metal deposits nearby. The rocks in the vicinity are part of a large Tertiary intrusion. Loney and others (1975) call it a hornblende-biotite granodiorite; Reifenstuhl (1986) assigns the rocks to the border phase of the Crawfish Pluton which consists mainly of hornblende-biotite granodiorite and tonalite that has been dated as 48.0 plus/minus 1.4 Ma and 48.3 plus/minus 1.3 Ma. Based on the report of radium in the water of the springs, West and Benson (1955) completed three traverses for up to two miles away from the hot springs to assess the radioactivity of the area. The most radioactive sample was of granite slope wash between the Main Spring and the Magnesia Spring; it contained 0.016 percent equivalent uranium. A sample of beach sand at Goddard contained 0.015 percent equivalent uranium, and a sample of sand and gravel about 0.8 mile north of Goddard contained 0.015 percent equivalent uranium. The other samples were lower. In most of the samples, the radioactive is probably due mainly to thorium in allanite which forms up to 7 percent of some of the mineral concentrates.
Workings: Several traverses were carried out in 1949 by the U.S. Geological Survey in the vicinity of the hot springs to determine the radioactivity of the rocks in the area.
Age: Radioactive allanite is an accessory mineral in a Tertiary granitic pluton dated at about 48 Ma.
Reserves: None.
Commodities (Major) - Th, U
Development Status: None
Deposit Model: Radioactive allanite in granitic rocks.
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
Detailed Mineral List:
| ⓘ 'Allanite Group' Formula: (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Unclassified | |||
|---|---|---|---|
| ⓘ | 'Allanite Group' | - | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Allanite Group | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
| O | Oxygen | |
| O | ⓘ Allanite Group | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
| Si | Silicon | |
| Si | ⓘ Allanite Group | (A12+REE3+)(M13+M23+M32+)O[Si2O7][SiO4](OH) |
Other Databases
| Link to USGS - Alaska: | PA001 |
|---|
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