Mineral Properties and Mine Development (Tables)

3 Months Ended

Mar. 31, 2016

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)	2016			2015
Mineral Properties:
Montana, United States of America
Stillwater Mine	$	1,950		$	1,950
Ontario, Canada
Marathon properties	8,560			8,560
San Juan, Argentina
Altar property	101,970			101,970
Mine Development:
Montana, United States of America
Stillwater Mine	713,614			697,781
East Boulder Mine	224,475			220,281
	1,050,569			1,030,542
Accumulated depletion and amortization	(470,804		)	(457,311		)
Total mineral properties and mine development, net	$	579,765		$	573,231