Pioneer Creek Prospect, Anchorage Mining District, Matanuska-Susitna Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Pioneer Creek Prospect | Prospect |
| Anchorage Mining District | Mining District |
| Matanuska-Susitna Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 27' 36'' North , 149° 11' 24'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Butte | 3,246 (2011) | 12.4km |
| Gateway | 5,552 (2011) | 12.8km |
| Knik River | 744 (2011) | 14.7km |
| Palmer | 6,788 (2017) | 16.0km |
| Lakes | 8,364 (2011) | 17.5km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Mat-Su Rock and Mineral Club | Palmer, Alaska | 16km |
| Chugach Gem & Mineral Society | Anchorage, Alaska | 46km |
Bjorklund and Wright (1948) considered the deposit to be too small and too low grade to be mineable under conditions prevailing in 1940's.
Location: Along Pioneer Creek, 1/2 mile south of Pioneer Creek bridge on the Old Glenn Highway, between 800- and 1,500 ft elevation. Accurate within 1,000 feet. This is locality 'Pioneer Creek Area' of Rose (1966), locality 43 of Cobb (1972), and locality 32 of MacKevett and Holloway (1977).
Geology: Jurassic dunite of the Eklutna Sequence containing two mineralized zones about 400 ft apart containing chromite in stringers, small pods, and disseminations. These are separated by olivine and minor clinopyroxene (Bjorklund and Wright, 1948). The lower zone strikes N 50 W, and dips 37 to 78 NE, and can be traced for 50 ft in outcrops and trenches. The upper zone strikes N 10 W, and dips 35 NE, can be traced for 30 ft in trenches, and has a maximum width of 30 ft. There is evidence in the upper zone that indicates some of the dunite may be slumped talus blocks rather than in place (Rose, 1966). Calculated grades based on weighted average analysis was 6.8 percent chromite for the lower zone and 6.9 percent chromite for the upper zone (Bjorklund and Wright, 1948). The best exposure assayed 7.5 percent chromite across a 13.5 ft zone (Rose, 1966).
Workings: Trenched by the U.S. Bureau of Mines in 1942. Calculated grades based on weighted average analysis for the lower zone was 6.8 percent chromite and 6.9 percent chromite for the upper zone (Bjorklund and Wright, 1948). The best exposure assayed 7.5 percent chromite across a 13.5 ft zone (Rose, 1966).
Age: Lower to Middle Jurassic
Alteration: Slight serpentinization of olivine.
Commodities (Major) - Cr
Development Status: None
Deposit Model: Podiform chromite or Alaskan PGE (Cox and Singer, 1986; models 8a or 9)
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 | |||
|---|---|---|---|
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Other Databases
| Link to USGS - Alaska: | AN094 |
|---|
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