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Hamilton Creek occurrence, Kupreanof Island, Petersburg Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Hamilton Creek occurrence | Occurrence |
| Kupreanof Island | Island |
| Petersburg Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
56° 51' 56'' North , 133° 39' 42'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Kake | 570 (2017) | 21.2km |
Other/historical names associated with this locality:
ARDF - PE003
Likely that the Pybus Formation elsewhere in the vicinity has beds or lenses of marine phosphorite.
Location: As first identified by Dickinson (1979), three samples were collected 'from a road-metal pit located near the center of the southern half of section 6, T. 58 S., R. 75 E, in the Petersburg D-5 quadrangle'. This is just south of Hamilton Creek. The quarry is shown on the current (1993 series) U. S. Forest Service, 1:63,360-scale road map for the quadrangle.
Geology: A sedimentary uranium deposit associated with chemically precipitated, marine phosphorite that contains carbonate fluorapatite as the uranium- bearing mineral (Dickinson, 1979). Fragments of laminated phosphate rock occur in white calcite veins in a fine grained, light to dark gray, laminated, apatite-bearing silty dolomite. Radioactivity reaches 20 times background in a 0.5 m thick bed. One sample of more highly radioactive rock indicated beta eU of 80, plus-or-minus 24 ppm uranium. Unit poorly exposed. Dickinson (1979) tentatively assigned the dolomite to the Permian Cannery Formation. More recent work by Brew and others (1984) indicates that the Cannery Formation is of Mississippian and Devonian age and by Karl (personal communication, 1998) indicates that the Cannery is probably Mississippian and Permian in age. Brew and others (1984), however, recently assign the rocks in the vicinity of the occurrence to the Permian Pybus Formation, a sequence of limestone, dolomite, and chert that outcrops widely on Kuiu and Kupreanof Islands.
Workings: None apparently; occurrence exposed in a quarry for road metal.
Age: Permian based on age of host rock.
Production: None
Reserves: None
Commodities (Major) - U
Development Status: None
Deposit Model: Sedimentary phosphate (Cox and Singer, 1984; model 34c or 34d)
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.
Detailed Mineral List:
| ⓘ Fluorapatite Formula: Ca5(PO4)3F |
| ⓘ Fluorapatite var. Carbonate-rich Fluorapatite Formula: Ca5(PO4,CO3)3(F,O) |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 8 - Phosphates, Arsenates and Vanadates | |||
|---|---|---|---|
| ⓘ | Fluorapatite var. Carbonate-rich Fluorapatite | 8.BN.05 | Ca5(PO4,CO3)3(F,O) |
| ⓘ | 8.BN.05 | Ca5(PO4)3F | |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Fluorapatite var. Carbonate-rich Fluorapatite | Ca5(PO4,CO3)3(F,O) |
| O | Oxygen | |
| O | ⓘ Fluorapatite var. Carbonate-rich Fluorapatite | Ca5(PO4,CO3)3(F,O) |
| O | ⓘ Fluorapatite | Ca5(PO4)3F |
| F | Fluorine | |
| F | ⓘ Fluorapatite var. Carbonate-rich Fluorapatite | Ca5(PO4,CO3)3(F,O) |
| F | ⓘ Fluorapatite | Ca5(PO4)3F |
| P | Phosphorus | |
| P | ⓘ Fluorapatite var. Carbonate-rich Fluorapatite | Ca5(PO4,CO3)3(F,O) |
| P | ⓘ Fluorapatite | Ca5(PO4)3F |
| Ca | Calcium | |
| Ca | ⓘ Fluorapatite var. Carbonate-rich Fluorapatite | Ca5(PO4,CO3)3(F,O) |
| Ca | ⓘ Fluorapatite | Ca5(PO4)3F |
Other Databases
| Link to USGS - Alaska: | PE003 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
USA
- Alaska
- Petersburg Borough
- Kupreanof Mining DistrictMining District
- ⭔Wrangell-Petersburg Census AreaBorough
- Petersburg Borough
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References
Dickinson, Kendell A. (1979) Uraniferous phosphate occurrence on Kupreanof Island, Southeast Alaska. Open-File Report Vol. 1979 (79-1316). US Geological Survey p.2doi:10.3133/ofr791316
