ROYALTY ACQUISITIONS (Details) (USD $)	12 Months Ended						1 Months Ended					1 Months Ended	12 Months Ended	1 Months Ended			1 Months Ended				1 Months Ended					1 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	May 23, 2012 Ruby Hill Royalty Acquisition	May 23, 2012 Ruby Hill Royalty Acquisition Production stage royalty interests	May 23, 2012 Ruby Hill Royalty Acquisition Exploration stage royalty interests	Dec. 31, 2011 Tulsequah subsidiary	Jun. 30, 2012 Tulsequah	Dec. 22, 2011 Tulsequah oz	Jun. 30, 2012 Mt. Milligan	Dec. 14, 2011 Mt. Milligan	Oct. 31, 2010 Milligan I Acquisition oz	Jun. 30, 2012 Milligan I Acquisition	Mar. 31, 2012 Milligan II Acquisition	Dec. 31, 2011 Milligan II Acquisition subsidiary	Dec. 14, 2011 Milligan II Acquisition	Dec. 31, 2011 Milligan II Acquisition Thompson Creek subsidiary	Jul. 31, 2010 Pascua-Lama	Oct. 28, 2010 Pascua-Lama	Jul. 02, 2010 Pascua-Lama item	Oct. 31, 2010 Pascua-Lama Gold NSR	Jul. 31, 2010 Pascua-Lama Gold NSR	Oct. 28, 2010 Pascua-Lama Gold NSR	Jul. 02, 2010 Pascua-Lama Gold NSR	Jul. 02, 2010 Pascua-Lama Copper NSR	Jan. 31, 2010 Andacollo	Jan. 25, 2010 Andacollo
Acquisition of Royalty Interest in Mineral Properties
Number of subsidiaries entering into the agreement							1								1		1
Percentage of payable ounces of gold purchased											40.00%	25.00%				15.00%
Total purchase amount				$ 38,000,000	$ 24,300,000	$ 13,700,000			$ 60,000,000		$ 581,500,000	$ 311,500,000				$ 270,000,000								$ 53,000,000			$ 273,000,000
Cash paid for acquisition of royalty interests	276,683,000	280,009,000	232,996,000				10,000,000					226,500,000	252,600,000	45,000,000	112,000,000			53,000,000			28,000,000	25,000,000				217,900,000
Maximum cash payment for each payable ounce of gold until specified threshold ounces have been delivered (in dollars per ounce)									450			400
Maximum quantity of gold with specified purchase price (in ounces)									48,000			550,000
Maximum cash payment for each payable ounce of gold over specified threshold ounces have been delivered (in dollars per ounce)									500			450
Cash payment for each payable ounce of gold (in dollars per ounce)																435
Future scheduled payments										126,900,000	216,900,000
Future scheduled payments for each quarter in calendar year 2012										45,000,000
Aggregate future scheduled payments for calendar year 2012										180,000,000
Future scheduled payments for first two quarters in calendar year 2013										12,000,000
Future scheduled payments for third quarter in calendar year 2013										12,900,000
Aggregate future scheduled payments for calendar year 2013										36,900,000
Number of common shares issued for acquisition of royalty interests																										1,204,136
Transaction costs																				1,100,000							1,700,000
Value of common shares issued as purchase price																											53,400,000
Number of assignment of rights agreements																				2
Number of private Chilean citizens with assignment of rights agreements																				2
Aggregate additional NSR sliding-scale royalty acquired with two payments (as a percent)																				0.75%
Price of gold above which sliding-scale royalties reach 5.23% (in dollars per ounce)																			800
Percentage of royalty interests acquired				3.00%																			0.40%	0.35%	0.20%
Aggregate percentage of maximum sliding-scale royalty interests after acquisition of additional interests																							5.23%		1.05%
Maximum future additional payments upon satisfaction of certain conditions in the Tulsequah Agreement								50,000,000
Percentage of produced payable gold to be purchased until 48,000 ounces have been delivered									12.50%
Percentage of produced payable gold to be purchased after 48,000 ounces have been delivered									7.50%
Percentage of produced payable silver to be purchased until 2,775,000 ounces have been delivered									22.50%
Maximum cash payment for each payable ounce of silver until 2,775,000 ounces have been delivered (in dollars per ounce)									5.00
Maximum quantity of silver with maximum cash payment of $5.00 per ounce (in ounces)									2,775,000
Percentage of produced payable silver to be purchased after 2,775,000 ounces have been delivered									9.75%
Maximum cash payment for each payable ounce of silver after 2,775,000 ounces have been delivered (in dollars per ounce)									$ 7.50
Streaming percentage for payable gold and payable silver upon suspension of obligations									6.50%