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Property, Plant and Equipment - Disclosure of Gold Resource Value Assumptions (Details) - $ / oz
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
South Africa      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Measured 25.00 25.00 32.69
Indicated 8.00 8.00 18.68
Inferred 2.80 2.80 4.67
Hidden Valley      
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]      
Indicated 8.00 5.84 5.84
Inferred   5.84 5.84