Mineral Properties and Mine Development (Tables)

3 Months Ended

Mar. 31, 2015

Extractive Industries [Abstract]

Schedule of Mineral Properties and Mine Development

Mineral properties and mine development reflected in the accompanying balance sheets consisted of the following:

	March 31,			December 31,
(In thousands)	2015			2014
Mineral Properties:
Montana, United States of America
Stillwater Mine	$	1,950		$	1,950
Ontario, Canada
Marathon properties	55,332			55,332
San Juan, Argentina
Altar property	101,970			101,970
Mine Development:
Montana, United States of America
Stillwater Mine	636,376			616,872
East Boulder Mine	209,106			204,483
	1,004,734			980,607
Accumulated depletion and amortization	(422,931		)	(411,601		)
Total mineral properties and mine development, net	$	581,803		$	569,006