Consolidated Statement of Stockholders' Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Stock	Series A Mandatory Convertible Preferred Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Deficit Accumulated During the Development Stage	Total Molycorp Stockholders	Noncontrolling interest
Balance at Dec. 31, 2010	$ 446,513	$ 82	$ 0	$ 539,866	$ 0	$ (93,435)	$ 446,513	$ 0
Balance, shares at Dec. 31, 2010		82,291,200	0
Sale of Series A mandatory convertible preferred stock at $100.00 per share, net of underwriting fees and other offering costs	199,642		2	199,640			199,642
Sale of Series A mandatory convertible preferred stock at $100.00 per share, net of underwriting fees and other offering costs, shares			2,070,000
Stock-based compensation	3,386			3,386			3,386
Stock-based compensation, shares		10,735
Issuance of shares for interest in Molycorp Silmet	81,725	2		72,653			72,655	9,070
Issuance of shares for interest in Molycorp Silmet, shares		1,593,419
Component of convertible debt	36,227			36,227			36,227
Deferred taxes on component of convertible debt	14,039			14,039			14,039
Net income	46,557					45,589	45,589	968
Preferred dividends	(3,320)					(3,320)	(3,320)
Other comprehensive income	1,324				1,193		1,193	131
Balance at Jun. 30, 2011	$ 826,093	$ 84	$ 2	$ 865,811	$ 1,193	$ (51,166)	$ 815,924	$ 10,169
Balance, shares at Jun. 30, 2011		83,895,354	2,070,000