Overview
Status | Archived |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Continuous
- Room-and-pillar
|
Processing |
- Flotation
- Dense media separation
|
Source:
Company | Interest | Ownership |
|
|
Indirect
|
Upon the close of the Transaction, Knight Hawk will take control of Armstrong's ongoing operations.
Mining Methods
- Continuous
- Room-and-pillar
Summary:
Armstrong has been producing coal at Parkway since 2009 utilizing continuous mining units employing room-and-pillar mining techniques.
Processing
- Flotation
- Dense media separation
Source:
Summary:
The treatments we employ at our preparation plants depend on the size of the raw coal. For coarse material, the separation process relies on the difference in the density between coal and waste rock where, for the very fine fractions, the separation process relies on the difference in surface chemical properties between coal and the waste minerals. To remove impurities, we crush raw coal and classify it into various sizes. For the largest size fractions, we use dense media vessel separation techniques in which we float coal in a tank containing a liquid of a pre-determined specific gravity. Since coal is lighter than its impurities, it floats, and we can separate it from rock and shale. We treat intermediate sized particles with dense medium cyclones, in which a liquid is spun at high speeds to separate coal from rock. Fine coal is treated in spirals, in which the differences in density between coal and rock allow them, when suspended in water, to be separated. Ultra fine coal is recov ........

Production:
Commodity | Units | 2016 | 2015 | 2014 | 2013 |
Coal (thermal)
|
k tons
| 500 | 1,107 | 1,125 | 1,347 |
Heat Content | BTU/lb | 11,760 | 11,760 | 11,760 | 11,760 |
All production numbers are expressed as clean coal.
Reserves at December 31, 2015:
Category | Tonnage | Commodity |
Proven
|
6,011 k tons
|
Coal (thermal)
|
Probable
|
2,822 k tons
|
Coal (thermal)
|
Proven & Probable
|
8,833 k tons
|
Coal (thermal)
|
Heavy Mobile Equipment as of December 31, 2015:
HME Type | Quantity |
Continuous Miner
|
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|
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