Mineral Properties and Mine Development (Tables)

9 Months Ended

Sep. 30, 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:

	September 30,			December 31,
(In thousands)	2015			2014
Mineral Properties:
Montana, United States of America
Stillwater Mine	$	1,950		$	1,950
Ontario, Canada
Marathon properties	8,560			55,332
San Juan, Argentina
Altar property	101,970			101,970
Mine Development:
Montana, United States of America
Stillwater Mine	681,443			616,872
East Boulder Mine	216,232			204,483
	1,010,155			980,607
Accumulated depletion and amortization	(445,565		)	(411,601		)
Total mineral properties and mine development, net	$	564,590		$	569,006