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Consolidated Statements of Income (Loss) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Consolidated Statements of Income (Loss) [abstract] |  |  |
Sales |  | $ 49,208 | $ 41,634
Royalty revenue |  | 19,067 | 20,737
Total revenue |  | 68,275 | 62,371
Cost of sales excluding depletion |  | 15,321 | 12,834
Depletion |  | 29,580 | 27,654
Total cost of sales |  | 44,901 | 40,488
Gross Profit |  | 23,374 | 21,883
Expenses and other (income) |  |  |
Administration expenses | [1] | 6,736 | 5,031
Project evaluation | [1] | 4,564 | 5,064
Foreign exchange (gain) loss |  | (2,434) | 87
(Gain) on revaluation of investments |  | (5,827) | (22,093)
Finance income |  | (722) | (2,598)
Finance expense |  | 2,187 | 2,993
Mineral, royalty and other interests impairments |  | 9,104 | 2,507
(Gain) loss on mineral interest disposal and other |  | (4,848) | 1,107
Income before taxes |  | 14,614 | 29,785
Current income tax expense |  | 868 | 306
Deferred income tax expense |  | 3,209 | 4,225
Total tax expense (income) |  | 4,077 | 4,531
Net income for the year |  | $ 10,537 | $ 25,254
Earnings per share |  |  |
Basic earnings per share |  | $ 0.06 | $ 0.18
Diluted earnings per share |  | $ 0.06 | $ 0.17
Weighted average number of common shares outstanding |  |  |
Basic |  | 167,265,059 | 144,159,678
Diluted |  | 174,703,186 | 149,961,923
[1] | Equity settled stock based compensation (a non-cash item) is included in administration expenses and project evaluation for the year ended December 31, 2017 $3,785 and December 31, 2016 $3,106.

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- Definition The amount of revenue arising from the sale of goods. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IAS -Number 18 -IssueDate 2016-01-13 -Paragraph 35 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=18&date=2016-03-30&anchor=para_35_b_i&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2016-01-13 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2016-03-30&anchor=para_70_b&doctype=Standard -URIDate 2016-03-31 + Details
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