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Segmented Information (Schedule of Segmented Information) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of operating segments [line items] |  |
Cost of sales | $ 168,745,000 | $ 172,606,000
Sales to external customers | 278,966,000 | 257,187,000
Cost of sales before depreciation and depletion | (124,967,000) | (128,248,000)
Depreciation and depletion in cost of sales | (43,778,000) | (44,358,000)
Selling, general and administration | (35,086,000) | (29,805,000)
Other income (expenses) | (17,897,000) | (20,582,000)
Finance items | 1,717,000 | 9,777,000
Income before income taxes | 58,955,000 | 43,971,000
Total tax expense | (37,402,000) | (20,175,000)
Net income for the year | 21,553,000 | 23,796,000
Assets | 1,055,338,000 | 936,065,000
Liabilities | 329,568,000 | 300,639,000
Capital Expenditure | 94,715,000 | 238,637,000
Material reconciling items [member] |  |
Disclosure of operating segments [line items] |  |
Selling, general and administration | (23,141,000) | (17,438,000)
Other income (expenses) | 42,000 | (4,402,000)
Finance items | (1,689,000) | (80,000)
Income before income taxes | (24,788,000) | (21,920,000)
Total tax expense | (3,841,000) | (511,000)
Net income for the year | (28,629,000) | (22,431,000)
Assets | 27,328,000 | 60,134,000
Liabilities | 186,708,000 | 162,210,000
Capital Expenditure | 122,000 | 1,333,000
Bateas Reporting Segment [member] |  |
Disclosure of operating segments [line items] |  |
Sales to external customers | 67,643,000 | 72,882,000
Cost of sales before depreciation and depletion | (40,056,000) | (44,829,000)
Depreciation and depletion in cost of sales | (14,301,000) | (13,621,000)
Selling, general and administration | (3,891,000) | (4,569,000)
Other income (expenses) | (1,215,000) | (664,000)
Finance items | (698,000) | (1,552,000)
Income before income taxes | 7,482,000 | 7,647,000
Total tax expense | (4,312,000) | (2,761,000)
Net income for the year | 3,170,000 | 4,886,000
Assets | 125,286,000 | 116,501,000
Liabilities | 42,710,000 | 36,747,000
Capital Expenditure | 6,927,000 | 11,845,000
Cuzcatlan Reporting Segment [member] |  |
Disclosure of operating segments [line items] |  |
Sales to external customers | 191,026,000 | 184,305,000
Cost of sales before depreciation and depletion | (76,459,000) | (83,419,000)
Depreciation and depletion in cost of sales | (27,856,000) | (30,737,000)
Selling, general and administration | (8,054,000) | (7,798,000)
Other income (expenses) | (3,742,000) | (1,928,000)
Finance items | (104,000) | 385,000
Income before income taxes | 74,811,000 | 60,808,000
Total tax expense | (28,926,000) | (18,032,000)
Net income for the year | 45,885,000 | 42,776,000
Assets | 280,602,000 | 252,100,000
Liabilities | 49,500,000 | 42,264,000
Capital Expenditure | 15,801,000 | 14,046,000
Lindero Reporting Segment [member] |  |
Disclosure of operating segments [line items] |  |
Other income (expenses) | 3,306,000 | 11,204,000
Lindero Reporting Segment [member] | Increase (decrease) due to voluntary changes in accounting policy [member] |  |
Disclosure of operating segments [line items] |  |
Cost of sales | 10,073,000 | 0
Sales to external customers | 20,297,000 | 0
Mansfield Reporting [Member] |  |
Disclosure of operating segments [line items] |  |
Sales to external customers | 20,297,000 |
Cost of sales before depreciation and depletion | (8,452,000) |
Depreciation and depletion in cost of sales | (1,621,000) |
Other income (expenses) | (12,982,000) | (13,588,000)
Finance items | 4,208,000 | 11,024,000
Income before income taxes | 1,450,000 | (2,564,000)
Total tax expense | (323,000) | 1,129,000
Net income for the year | 1,127,000 | (1,435,000)
Assets | 622,122,000 | 507,330,000
Liabilities | 50,650,000 | 59,418,000
Capital Expenditure | $ 71,865,000 | $ 211,413,000

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