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Mining concessions, development costs, property, plant and equipment, net (Details 1) | Dec. 31, 2018 $ / Ounce-oz | Dec. 31, 2018 $ / MetricTon-Mg | Dec. 31, 2017 $ / Ounce-oz
--- | --- | --- | ---
Gold (per ounce) [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Commodity price estimates | 1,300 | 1,221 | 1,221
Not later than one year [member] | Gold (per ounce) [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Commodity price estimates | 1,250 | 1,300 |
Not later than one year [member] | Silver [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Commodity price estimates | $ / Ounce-oz | 16 |  |
Not later than one year [member] | Copper [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Commodity price estimates |  | 6,750 |
Not later than one year [member] | Lead [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Commodity price estimates |  | 2,100 |
Later than one year and not later than two years [member] | Gold (per ounce) [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Commodity price estimates | $ / Ounce-oz | 1,300 |  |
Later than one year and not later than two years [member] | Silver [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Commodity price estimates | $ / Ounce-oz | 17 |  |
Later than one year and not later than two years [member] | Copper [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Commodity price estimates |  | 7,000 |
Later than one year and not later than two years [member] | Lead [Member] |  |  |
Disclosure of Mining concessions, development costs, property, plant and equipment, net [Line Items] |  |  |
Commodity price estimates |  | 2,100 |

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