RECLAMATION AND MINE CLOSURE (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2013

Dec. 31, 2012

Asset Retirement Obligation Disclosure [Abstract]

Asset Retirement Obligation

Changes to the Company’s asset retirement obligations are as follows (in thousands):

	Years ended December 31,
	2012			2011
Asset retirement obligation – Beginning	$	32,714		$	27,302
Accretion		2,911			2,648
Addition and changes in estimates		(1,073	)		2,822
Settlements		(95	)		(58	)
Asset retirement obligation – December 31	$	34,457		$	32,714

Asset Retirement Obligation

Changes to the Company’s asset retirement obligations for active mining sites are as follows (in thousands):

	Three months ended June 30,						Six months ended June 30,
	2013			2012			2013			2012
Asset retirement obligation – Beginning	$	35,197		$	33,434		$	34,457		$	32,714
Accretion		758			742			1,500			1,466
Addition and changes in estimates		—			335			—			335
Settlements		(377	)		(1	)		(379	)		(5	)
Asset retirement obligation	$	35,578		$	34,510		$	35,578		$	34,510