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COMMITMENTS AND CONTINGENCIES (Tables)
12 Months Ended
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]  
Gross value and accumulated amortization of property, plant and equipment and mine development assets under capital leases
The following shows the gross value and accumulated amortization of property, plant and equipment and mine development assets under capital leases related primarily to the leasing of mining equipment: 
 
2013
 
2012
 
(In thousands)
Gross value
$
24,982

 
$
34,677

Accumulated amortization
11,983

 
15,887

Future minimum capital and operating lease payments
Future minimum capital and operating lease payments as of December 31, 2013, are as follows: 
 
Capital
Leases
 
Operating
Leases
 
(In thousands)
2014
$
5,949

 
$
7,896

2015
2,419

 
5,156

2016
1,548

 
2,584

2017
495

 
1,256

2018
316

 
515

Thereafter

 

Total minimum lease payments
10,727

 
$
17,407

Less imputed interest
(574
)
 
 
Present value of minimum capital lease payments
$
10,153