Big Mac Occurrence, Tok Mining District, Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Big Mac Occurrence | Occurrence |
| Tok Mining District | Mining District |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 10' 2'' North , 144° 13' 48'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Mentasta Lake | 112 (2011) | 35.9km |
| Slana | 147 (2011) | 52.9km |
Mindat Locality ID:
196505
Long-form identifier:
mindat:1:2:196505:9
GUID (UUID V4):
d3c360f6-3f14-42d5-8038-b90c26ad4de8
The unpublished data that is cited can be seen by contacting Grayd Resources Inc. in Vancouver, B.C., Canada (www.grayd.com), or Northern Associates Inc. in Fairbanks, Alaska.
Location: The Big Mac occurrence is located at an elevation of about 5,700 feet between the head of Rumble Creek and the Tok River. It is approximately 0.4 mile northeast of peak 7725 in the west-central portion of section 14, T. 16 N., R. 6 E., Copper River Meridian. The location is accurate.
Geology: The Big Mac occurrence consists of massive pyrite lenses as much as 1 foot thick and semimassive pyrite lenses as much as 10 feet thick; the lenses are in interbedded felsic metavolcanic rocks, pyritic exhalite (?), and minor limestone and graphitic black schist. The mineralized layer or unit can be traced for 1.5 miles along a cliff face; it is covered on the east and west by glacial till and ice. Base and precious metals values are at or below background levels in all samples collected (E. Hunter, unpublished data, 1998). The host rock is probably in the upper Tok River stratigraphic unit, but it is near a facies transition to the Hayes Glacier unit (Dashevsky and others, 2003).
Workings: The Big Mac occurrence was visited by American Copper and Nickel Company in 1994. Only background values for base and precious metal were found in the sulfides (E. Hunter, unpublished data, 1998).
Age: Devonian to Mississippian, on the basis of the age of the host rocks.
Commodities (Major) - Fe
Development Status: None
Deposit Model: Kuroko massive sulfide (Cox and Singer, 1986; model
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
2 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS - Alaska: | MH326 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Windy-McKinley DomainDomain
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References
