SUBSEQUENT EVENT (Details) (USD $)	6 Months Ended			0 Months Ended	6 Months Ended	0 Months Ended			6 Months Ended	0 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Revolving credit facility	Jan. 02, 2014 CVP DMFC	Dec. 31, 2013 CVP DMFC	Jan. 29, 2014 Subsequent event Revolving credit facility	Jan. 07, 2014 Subsequent event Goldrush mi	Jan. 02, 2014 Subsequent event CVP Chairman of the Board of Directors	Dec. 31, 2013 Subsequent event CVP Chairman of the Board of Directors	Jan. 02, 2014 Subsequent event CVP DMFC item	Jan. 02, 2014 Subsequent event CVP DMFC Cortez, excluding the Crossroad Claims	Jan. 02, 2014 Subsequent event CVP DMFC Crossroad Claims at Cortez	Jan. 02, 2014 Subsequent event CVP DMFC Chairman of the Board of Directors	Jan. 02, 2014 Subsequent event CVP DMFC Member of Board of Directors item	Jan. 02, 2014 Subsequent event CVP DMFC Former member of Board of Directors
Subsequent event
Number of limited partners from whom partner ownership interest was acquired										9
Additional ownership interest acquired (as a percent)				49.465%						49.465%			3.00%	8.00%	24.50%
Total purchase amount							$ 8,000,000			$ 11,500,000
Number of other board of director members holding limited partner interests														1
Ownership percentage held					31.633%			0.063%	3.063%	81.098%
Percentage of royalty interests acquired											1.014%	0.618%
Net revenue royalty acquired (as a percent)							1.00%
Cash paid for acquisition of royalty interests	48,089,000	215,032,000					1,000,000
Remaining consideration payable							7,000,000
Number of periods installments will be made to pay the remaining purchase price of royalty.							7 years
Distance of mining property from Cortez mine							4
Amendment to Revolving Credit Facility
Maximum availability under the revolving credit facility			350,000,000			450,000,000
Amount of accordion feature			50,000,000			150,000,000
Maximum availability under the revolving credit facility including accordion						$ 600,000,000
Commitment fee (as a percent)			0.375%			0.25%
Revolving credit facility, description of interest rate basis			LIBOR			LIBOR
Revolving credit facility, basis spread on interest rate (as a percent)			1.75%			1.25%
Leverage ratio, maximum						3.5
Maximum leverage ratio for two quarters following the completion of a material permitted acquisition						4.0