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Unnamed Occurrence (ARDF - FB139; at head of Eagle Creek), Bonnifield Mining District, Denali Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - FB139; at head of Eagle Creek) | - not defined - |
| Bonnifield Mining District | Mining District |
| Denali Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
64° 3' 32'' North , 148° 37' 40'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Healy | 1,021 (2018) | 27.9km |
| McKinley Park | 185 (2014) | 38.9km |
Location: The location of this occurrence is uncertain; it may be a mile or more away from the coordinates given. Joesting (1942 [ATDM MR 194-11, p. 10]) described it as being on the divide between Lynx and Eagle Creeks, probably in the SE1/4 sec. 12, T. 10 S., R. 6 W., Fairbanks Meridian.
Geology: The divide between Lynx and Eagle Creeks is underlain by the California Creek Member of the Totatlanika Schist. It consists of gray quartz-orthoclase-sericite schist and augen gneiss (Wahrhaftig, 1970 [GQ 810]). In a report of antimony deposits in the Fairbanks area, Brooks (1916 [B 642-A]), states that where the lode has been opened, the limits of ore deposition appear to be within walls 3 to 4 feet apart, widening to as much as 10 feet in some places. The richest ore occurs in shoots, which appear to be pod or lens shaped. The largest of these shoots measured 40 feet in its longest dimension. The shoots are separated by an aggregate of quartz intergrown with stibnite and kidneys of stibnite, together with iron-stained fragments of the schist that form the country rock . Stibnite is the only important metallic mineral in the lode, but a little free gold and galena are also present, as well as possibly pyrite. The surface of the masses of stibnite shows considerable oxidation; secondary minerals form an incrustation half an inch or more in thickness. The larger ore shoots are composed of almost entirely stibnite with some quartz (Brooks, 1916 [B 642-A]). Antimony ore in float on the divide between Lynx Creek and Eagle Creeks was examined in 1942 by the Alaska Department of Mines (Joesting, 1942 [ATDM MR 194-11, p. 10-11]). High-grade, coarse, bladed stibnite float is scattered for 100 feet along the ridge (Joesting, 1943 [ATDM Pamph. 2]).
Workings: There may have been some pits dug prior to 1916. Samples of stibnite were found in float (Joesting, 1942 [ATDM MR 194-11]).
Commodities (Major) - Sb; (Minor) - Ag, Au
Development Status: None
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 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
Other Databases
| Link to USGS - Alaska: | FB139 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- North America PlatformPassive Margin
- Yukon-Tanana lower DomainDomain
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