AMAK ASSET RETIREMENT OBLIGATIONS - Deferred Mine Closure Costs (Details) - AMAK - SAR (ر.س)	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Cost	ر.س 12,842,625	ر.س 12,842,625
Accumulated amortization	(6,886,626)	(6,142,126)
Deferred mine closure costs, net	ر.س 5,955,999	ر.س 6,700,499

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