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Derivative financial instruments (Details 1) | 12 Months Ended
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Dec. 31, 2017 USD ($) DMT | Dec. 31, 2016 USD ($) DMT
Disclosure of derivative financial instruments [Line Items] |  |
Current derivative financial liabilities | $ 0 | $ 1,524,000
Copper [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Quantity of Metal | DMT | 24,846 | 29,121
Period of quotations | January – March | January - April
Current derivative financial liabilities | $ 2,508,000 | $ 397,000
Gold [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Quantity of Metal | DMT | 64,898 | 15,370
Period of quotations | January – March | January – February
Current derivative financial liabilities | $ 1,066,000 | $ 481,000
Silver [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Period of quotations | January – April | January - April
Current derivative financial liabilities | $ 1,815,000 | $ (1,825,000)
Lead [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Quantity of Metal | 22,735 | 23,636
Period of quotations | January – April | January - April
Current derivative financial liabilities | $ 229,000 | $ (801,000)
Zinc [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Quantity of Metal | DMT | 54,603 | 29,407
Period of quotations | January – April | January – March
Current derivative financial liabilities | $ 1,806,000 | $ (172,000)
Bottom of range [member] | Copper [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Provisional quotation | 6,645.36 | 2,985.28
Future quotation | 7,112,500 | 5,535,760
Bottom of range [member] | Gold [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Provisional quotation | 1,256.45 | 1,139.75
Future quotation | 1,258,000 | 1,151,000
Bottom of range [member] | Silver [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Provisional quotation | 16.02 | 16.32
Future quotation | 16,070 | 16,420
Bottom of range [member] | Lead [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Provisional quotation | 2,333.23 | 1,871.58
Future quotation | 2,488,000 | 2,017,000
Bottom of range [member] | Zinc [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Provisional quotation | 3,103.72 | 2,291.08
Future quotation | 3,226,500 | 2,578,000
Top of range [member] | Copper [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Provisional quotation | 6,841.95 | 5,824.00
Future quotation | 7,275,000 | 5,642,250
Top of range [member] | Gold [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Provisional quotation | 1,317.67 | 1,145.90
Future quotation | 1,317,100 | 1,179,400
Top of range [member] | Silver [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Provisional quotation | 18.00 | 19.35
Future quotation | 17,210 | 16,660
Top of range [member] | Lead [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Provisional quotation | 3,110.69 | 2,380.60
Future quotation | 2,579,750 | 2,080,000
Top of range [member] | Zinc [Member] |  |
Disclosure of derivative financial instruments [Line Items] |  |
Provisional quotation | 3,275.47 | 2,732.10
Future quotation | $ 3,343,500 | $ 2,612,500

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