Disclosure of detailed information about inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statements Line Items
Warehouse inventory	$ 8,638	$ 7,809
Stockpile inventory	1,564	0
Work in process inventory	322	496
Finished goods inventory	4,370	4,826
Inventories	$ 14,894	$ 13,131

Statement [Line Items]

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- Definition

Warehouse inventory

+ References

No definition available.

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- Definition

A classification of current inventory representing the amount of ore stockpiles. [Refer: Inventories]

+ References

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- Definition

A classification of current inventory representing the amount of goods that have completed the production process and are held for sale in the ordinary course of business. [Refer: Inventories]

+ References

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- Definition

The amount of current inventories. [Refer: Inventories]

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- Definition

A classification of current inventory representing the amount of assets currently in production, which require further processes to be converted into finished goods or services. [Refer: Current finished goods; Inventories]

+ References

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