Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 190,984	$ 266,463
Accounts receivable:
Trade	17,555	10,996
Other, net	7,466	9,313
Inventories:
Concentrates, doré, stockpiled ore, and metals in transit and in-process	15,073	13,692
Materials and supplies	13,564	12,503
Current deferred income taxes	29,398	27,810
Other current assets	8,858	21,967
Total current assets	282,898	362,744
Non-current investments	9,614	3,923
Non-current restricted cash and investments	871	866
Properties, plants, equipment and mineral interests, net	996,659	923,212
Non-current deferred income taxes	86,365	88,028
Other non-current assets	1,883	17,317
Total assets	1,378,290	1,396,090
Current liabilities:
Accounts payable and accrued liabilities	43,162	37,831
Accrued payroll and related benefits	10,760	12,878
Accrued taxes	12,321	10,354
Current portion of capital leases	5,564	4,005
Current portion of accrued reclamation and closure costs	19,845	42,248
Other current liabilities	3,335
Total current liabilities	94,987	107,316
Long-term capital leases	11,935	6,265
Accrued reclamation and closure costs	93,370	111,563
Other non-current liabilities	40,047	30,833
Total liabilities	240,339	255,977
Commitments and contingencies (Notes 2, 3, 4, 6, 7, 8, and 10)
Preferred stock, 5,000,000 shares authorized:
Series B preferred stock, $0.25 par value, 157,816 shares issued and outstanding, liquidation preference — $7,891	39	39
Common stock, $0.25 par value, authorized 500,000,000 shares; issued and outstanding 2012 — 285,209,848 shares and 2011 — 285,289,924 shares	71,499	71,420
Capital surplus	1,218,283	1,215,229
Accumulated deficit	(123,288)	(120,557)
Accumulated other comprehensive loss, net	(23,918)	(23,498)
Less treasury stock, at cost; 2012 — 788,288 shares and 2011 — 392,645 shares	(4,664)	(2,520)
Total shareholders’ equity	1,137,951	1,140,113
Total liabilities and shareholders’ equity	$ 1,378,290	$ 1,396,090