Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 377,436	$ 283,606
Investments		1,474
Accounts receivable	45,121	36,840
Concentrates, doré, and stockpiled ore	11,517	8,886
Materials and supplies	10,470	10,245
Current deferred income taxes	75,435	87,287
Other current assets	2,336	3,683
Total current assets	522,315	432,021
Non-current investments	4,161	1,194
Non-current restricted cash and investments	926	10,314
Properties, plants, equipment and mineral interests, net	855,482	833,288
Non-current deferred income taxes	73,851	100,072
Other non-current assets and deferred charges	3,654	5,604
Total assets	1,460,389	1,382,493
Current liabilities:
Accounts payable and accrued liabilities	44,355	31,725
Accrued payroll and related benefits	10,343	10,789
Accrued taxes	9,678	16,042
Current portion of capital leases	3,045	2,481
Current portion of accrued reclamation and closure costs	175,597	175,484
Current derivative contract liabilities	10,510	20,016
Total current liabilities	253,528	256,537
Capital leases	4,473	3,792
Accrued reclamation and closure costs	143,026	143,313
Other noncurrent liabilities	16,149	16,598
Total liabilities	417,176	420,240
Preferred stock, 5,000,000 shares authorized:
Capital surplus	1,180,740	1,179,751
Accumulated deficit	(189,179)	(265,577)
Accumulated other comprehensive loss	(15,843)	(15,117)
Less treasury stock, at cost; 2011 – 392,645 and 2010 – 335,957 shares	(2,520)	(2,051)
Total shareholders’ equity	1,043,213	962,253
Total liabilities and shareholders’ equity	1,460,389	1,382,493
Series B Preferred Stock [Member]
Preferred stock, 5,000,000 shares authorized:
Preferred Stock Value	39	39
Mandatory Convertible Preferred Stock [Member]
Preferred stock, 5,000,000 shares authorized:
Preferred Stock Value		504
Common stock, $0.25 par value, authorized 500,000,000 shares; issued and outstanding 2011 — 279,512,363 shares and 2010 — 258,485,666 shares	$ 69,976	$ 64,704