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PROPERTY, PLANT AND EQUIPMENT
9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT
PROPERTY, PLANT AND EQUIPMENT:

CONSOL Energy Inc.'s property, plant and equipment consists of the following:

 
September 30,
2017
 
December 31,
2016
Plant and Equipment
$
2,685,707

 
$
2,680,453

Airshafts
388,299

 
381,755

Coal Properties and Surface Lands
859,030

 
861,048

Mine Development
344,139

 
344,139

Advance Mining Royalties
326,892

 
326,000

Total Property, Plant and Equipment
4,604,067

 
4,593,395

Less: Accumulated Depreciation, Depletion and Amortization
2,508,143

 
2,413,125

Total Property, Plant and Equipment, Net
$
2,095,924

 
$
2,180,270



Coal reserves are controlled either through fee ownership or by lease. The duration of the leases vary; however, the lease terms are generally extended automatically to the exhaustion of economically recoverable reserves, as long as active mining continues. Coal interests held by lease provide the same rights as fee ownership for mineral extraction and are legally considered real property interests.

As of September 30, 2017 and December 31, 2016, property, plant and equipment includes gross assets under capital lease of $3,529 and $3,547, respectively. Accumulated amortization for capital leases was $2,717 and $2,399 at September 30, 2017 and December 31, 2016, respectively. Amortization expense for assets under capital leases approximated $104 and $116 for the three months ended and $315 and $304 for the nine months ended September 30, 2017 and 2016, respectively, and is included in Depreciation, Depletion and Amortization in the accompanying unaudited Combined Statements of Income.