Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 233,327	$ 266,463
Accounts receivable:
Trade	30,484	10,996
Other, net	6,662	9,313
Inventories:
Concentrates, doré, and stockpiled ore	9,786	13,692
Materials and supplies	13,396	12,503
Current deferred income taxes	25,779	27,810
Other current assets	20,062	21,967
Total current assets	339,496	362,744
Non-current investments	2,671	3,923
Non-current restricted cash and investments	866	866
Properties, plants, equipment and mineral interests, net	953,365	923,212
Non-current deferred income taxes	86,362	88,028
Other non-current assets and deferred charges	7,734	17,317
Total assets	1,390,494	1,396,090
Current liabilities:
Accounts payable and accrued liabilities	34,587	37,831
Accrued payroll and related benefits	9,182	12,878
Accrued taxes	3,736	10,354
Current portion of capital leases	4,552	4,005
Current portion of accrued reclamation and closure costs	39,694	42,248
Total current liabilities	91,751	107,316
Capital leases	9,054	6,265
Accrued reclamation and closure costs	111,806	111,563
Other noncurrent liabilities	32,450	30,833
Total liabilities	245,061	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 — 285,546,859 shares and 2011 — 285,289,924 shares	71,496	71,420
Capital surplus	1,216,659	1,215,229
Accumulated deficit	(115,734)	(120,557)
Accumulated other comprehensive loss	(24,304)	(23,498)
Less treasury stock, at cost; 2012 — 437,986 shares and 2011 — 392,645 shares	(2,723)	(2,520)
Total shareholders’ equity	1,145,433	1,140,113
Total liabilities and shareholders’ equity	$ 1,390,494	$ 1,396,090