Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 232,194	$ 266,463
Accounts receivable:
Trade	21,991	10,996
Other, net	7,827	9,313
Inventories:
Concentrates, doré, and stockpiled ore	11,730	13,692
Materials and supplies	13,440	12,503
Current deferred income taxes	31,537	27,810
Other current assets	12,230	21,967
Total current assets	330,949	362,744
Non-current investments	9,023	3,923
Non-current restricted cash and investments	866	866
Properties, plants, equipment and mineral interests, net	973,586	923,212
Non-current deferred income taxes	86,324	88,028
Other non-current assets and deferred charges	2,855	17,317
Total assets	1,403,603	1,396,090
Current liabilities:
Accounts payable and accrued liabilities	39,652	37,831
Accrued payroll and related benefits	10,124	12,878
Accrued taxes	9,743	10,354
Current portion of capital leases	4,654	4,005
Current portion of accrued reclamation and closure costs	34,146	42,248
Total current liabilities	98,319	107,316
Capital leases	10,163	6,265
Accrued reclamation and closure costs	113,928	111,563
Other noncurrent liabilities	33,905	30,833
Total liabilities	256,315	255,977
Commitments and contingencies
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 — 285,486,857 shares and 2011 — 285,289,924 shares	71,496	71,420
Capital surplus	1,217,461	1,215,229
Accumulated deficit	(117,471)	(120,557)
Accumulated other comprehensive loss	(21,219)	(23,498)
Less treasury stock, at cost; 2012 — 497,988 shares and 2011 — 392,645 shares	(3,018)	(2,520)
Total shareholders’ equity	1,147,288	1,140,113
Total liabilities and shareholders’ equity	$ 1,403,603	$ 1,396,090