ACQUISITIONS (Details)	12 Months Ended			0 Months Ended								12 Months Ended		0 Months Ended				12 Months Ended	0 Months Ended		12 Months Ended	0 Months Ended									0 Months Ended			0 Months Ended				1 Months Ended	12 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2012 USD ($)	Jan. 02, 2014 DMFC CVP USD ($)	Jun. 30, 2013 Seabridge	Jun. 16, 2011 Seabridge Initial Shares USD ($)	Jun. 16, 2011 Seabridge Initial Shares CAD	Oct. 28, 2011 Seabridge Initial Royalty CAD item	Jun. 16, 2011 Seabridge Initial Royalty	Dec. 13, 2012 Seabridge Additional Shares USD ($)	Dec. 13, 2012 Seabridge Additional Shares CAD	Jun. 30, 2013 Seabridge Additional Shares USD ($)	Jun. 16, 2011 Seabridge Additional Shares CAD	Dec. 13, 2012 Seabridge NSR Royalty Option 1 CAD	Dec. 13, 2012 Seabridge NSR Royalty Option 2 CAD	Dec. 13, 2012 Seabridge Increased Royalty CAD item	Jun. 16, 2011 Seabridge Increased Royalty	Jun. 30, 2014 Phoenix Gold Project USD ($)	Mar. 20, 2014 Phoenix Gold Project RGLD Gold USD ($)	Feb. 11, 2014 Phoenix Gold Project RGLD Gold USD ($) item oz	Jun. 30, 2014 Phoenix Gold Project RGLD Gold USD ($)	Jan. 07, 2014 Goldrush USD ($) item mi	Aug. 31, 2013 El Morro Goldcorp Inc.	Aug. 31, 2013 El Morro Chilean subsidiary USD ($)	Aug. 31, 2013 El Morro New Gold Inc.	Jan. 02, 2014 Cortez CVP	Jan. 02, 2014 Cortez, excluding the Crossroad Claims DMFC CVP	Dec. 31, 2013 Cortez, excluding the Crossroad Claims DMFC CVP	Jan. 02, 2014 Crossroad Claims at Cortez DMFC CVP	Dec. 31, 2013 Crossroad Claims at Cortez DMFC CVP	Dec. 19, 2011 Milligan II Acquisition USD ($)	Dec. 14, 2011 Milligan II Acquisition USD ($) item	Dec. 14, 2012 Milligan II Acquisition	Dec. 14, 2011 Milligan II Acquisition Thompson Creek item	Aug. 08, 2012 Milligan III Acquisition USD ($)	Aug. 08, 2012 Mt. Milligan USD ($)	Jul. 31, 2012 Mt. Milligan USD ($)	Sep. 30, 2013 Mt. Milligan USD ($)	Jun. 30, 2014 Mt. Milligan USD ($)
Acquisition of Royalty Interest in Mineral Properties
Total purchase amount																				$ 75,000,000		$ 8,000,000		$ 35,000,000
Total purchase amount	11,522,000			11,500,000																												270,000,000			200,000,000	781,500,000	581,500,000
Number of installments the purchase price of refined gold is payable																				5		7
Installments paid in conjunction with executive definitive documents																			20,000,000	10,000,000
Installment payable in conjunction with executive definitive documents																					15,000,000
Percentage of produced gold to be purchased until 135,000 ounces have been delivered																				6.30%
Maximum quantity of gold with specified purchase price (in ounces)																				135,000
Percentage of produced payable gold to be purchased after 135,000 ounces have been delivered																				3.15%
Purchase price per ounce of gold as percentage of spot price at the time of delivery																				25.00%
Maximum amount of senior debt prior to purchase price per ounce of gold of is reduced																				50,000,000
Factor to determine purchase price per ounce of gold at the time of delivery if senior secured debt exceeds stated level																				5.40%
Denominator to determine purchase price per ounce of gold at the time of delivery if senior secured debt exceeds stated level																				50,000,000
Payment of aggregate pre-production commitment																					30,000,000																	12,900,000	781,500,000
Royalty interests in Mineral Property, net (as a percent)																						1.00%	70.00%	2.00%	30.00%
Cash paid for acquisition of royalty interests	80,019,000	314,262,000	276,683,000																			1,000,000									112,000,000				75,000,000
Remaining consideration payable																		45,000,000				7,000,000																	0
Distance of mining property from Cortez mine																						4
Percentage of royalty interests acquired																								70.00%						0.00%
Percentage of royalty interests acquired																										1.25%	1.014%	0.39%	0.618%
Number of subsidiaries entering into the agreement																																1		1
Percentage of payable ounces of gold purchased																																	15.00%		12.25%	52.25%
Cash payment for each payable ounce of gold (in dollars per ounce)	435																																			435
Payment made for common shares acquired						30,700,000	30,000,000			18,300,000	18,000,000
Payment made for common shares acquired (in dollars per share)						$ 30.14	29.4
Percentage of royalty that can be acquired									1.25%					1.25%	2.00%		2.00%
Agreement for acquisition of common shares													18,000,000
Common shares acquired in a private placement						1,019,000	1,019,000			1,004,491	1,004,491
Premium on share price as a percentage of the volume weighted average trading price of common shares						15.00%	15.00%			15.00%	15.00%
Trading period used to calculate premium on share price						5 days	5 days			5 days	5 days
Holding period of shares as a condition to acquire additional shares								270 days		270 days	270 days
Purchase price of royalty								100,000,000						100,000,000	160,000,000	60,000,000
Number of installments in which the purchase price of royalty is payable								3								3
Installment period in which the purchase price of royalty is payable								540 days								540 days
Proceeds from sale of shares in private transaction										14,600,000	14,400,000
Exercisable period to acquire the Initial Royalty and the Increased Royalty					60 days
Realized loss on trading securities												$ 1,300,000