Unaudited Condensed Consolidated Balance Sheets - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 5,482,285	$ 5,934,043
Short-term investments		5,199,861
Accounts receivable	31,288,010	7,165,487
Inventories	7,950,960	10,057,787
Prepaid expenses	3,322,037	1,104,437
Total current assets	48,043,292	29,461,615
Property, plant and equipment, net	144,470,229	115,450,841
Advanced coal royalties	3,039,153	2,867,369
Other assets	624,920	318,206
Total Assets	196,177,594	148,098,031
Current liabilities
Accounts payable	22,723,150	19,532,531
Accrued expenses	6,630,213	2,821,422
Asset retirement obligations	734,188	70,616
Notes payable, net	14,836,754
Other	603,258
Total current liabilities	45,527,563	22,424,569
Deferred tax liability	1,448,478
Asset retirement obligations	12,183,049	12,276,176
Total liabilities	59,159,090	34,700,745
Commitments and contingencies
Stockholders' Equity
Preferred stock, $0.01 par value, 50,000,000 shares authorized, none issued and outstanding
Common stock, $0.01 par value, 260,000,000 shares authorized, 40,082,467 and 39,559,366 shares issued and outstanding, respectively	400,825	395,594
Additional paid-in capital	150,228,209	148,293,263
Accumulated deficit	(13,610,530)	(35,291,571)
Total stockholders' equity	137,018,504	113,397,286
Total Liabilities and Stockholders' Equity	$ 196,177,594	$ 148,098,031