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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Schedule of useful lives of property, plant and equipment

Depreciation is calculated using the straight-line method over the estimated useful lives of the property, plant and equipment, which are:

	Years
Land improvements	10
Plant and buildings	5-15
Real estate properties	10-40
Railroad and sidings	30
Vehicles	3-5
Machinery, equipment and tooling	3-15
Furniture and fixtures	3-10
Deferred mining costs	3

Net property, plant and equipment consisted of:

	March 31, 2018				December 31, 2017
Machinery, equipment and tooling	$	10,529			$	8,242
Vehicles	1,544				1,546
Furniture and fixtures	730				720
Plant and building	83,057				81,561
Real estate properties	4,432				4,432
Railroad and sidings	25,286				10,254
Land improvements	23,156				16,378
Asset retirement obligation	8,657				8,408
Mineral properties	9,879				9,878
Deferred mining costs	657				657
Construction in progress	71,639				56,493
	239,566				198,569
Less: accumulated depreciation and depletion	29,529				26,367
Total property, plant and equipment, net	$	210,037			$	172,202

Reconciliation of weighted-average common shares outstanding used in the calculation of basic and diluted net income (loss) per share

The following table reconciles the weighted-average common shares outstanding used in the calculation of basic net income per share to the weighted average common shares outstanding used in the calculation of diluted net income per share:

	Three Months Ended March 31, 2018			Three Months Ended March 31, 2017
Determination of Shares
Weighted average common shares outstanding	40,412			39,697
Assumed conversion of restricted stock	29			177
Diluted weighted average common stock outstanding	40,441			39,874

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- References

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- Definition

Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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