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Significant judgments, estimates and assumptions (Details) - The Mineral Resource Company II, LLC	12 Months Ended
	Dec. 31, 2018
Subsidiaries
Proportion of ownership interest in subsidiary	49.90%
Bottom
Subsidiaries
Distributions received (as a percent)	50.00%
Top
Subsidiaries
Distributions received (as a percent)	75.00%

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- Definition

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- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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