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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