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Mining Properties
 9 Months Ended
Sep. 30, 2017
Mining Properties [Abstract]  
MINING PROPERTIES
MINING PROPERTIES
Mining properties consist of the following (in thousands):
September 30, 2017
Palmarejo
 
Rochester
 
Kensington
 
Wharf
 
San
Bartolomé
 
La Preciosa
 
Total
Mine development
$
191,562

 
$
192,734

 
$
294,388

 
$
38,339

 
$
39,445

 
$
—

 
$
756,468

Accumulated amortization
(142,262
)
 
(142,686
)
 
(170,343
)
 
(14,984
)
 
(33,418
)
 
—

 
(503,693
)
 
49,300

 
50,048

 
124,045

 
23,355

 
6,027

 
—

 
252,775

Mineral interests
629,303

 
—

 
—

 
45,837

 
12,868

 
49,085

 
737,093

Accumulated amortization
(418,512
)
 
—

 
—

 
(23,264
)
—

(11,891
)
 
—

 
(453,667
)
 
210,791

 
—

 
—

 
22,573

 
977

 
49,085

 
283,426

Mining properties, net
$
260,091

 
$
50,048

 
$
124,045

 
$
45,928

 
$
7,004

 
$
49,085

 
$
536,201

December 31, 2016
Palmarejo
 
Rochester
 
Kensington
 
Wharf
 
San
Bartolomé
 
La Preciosa
 
Joaquin
 
Other
 
Total
Mine development
$
174,890

 
$
165,230

 
$
271,175

 
$
37,485

 
$
39,184

 
$
—

 
$
—

 
$
—

 
$
687,964

Accumulated amortization
(134,995
)
 
(138,244
)
 
(154,744
)
 
(11,699
)
 
(32,192
)
 
—

 


 
—

 
(471,874
)
 
39,895

 
26,986

 
116,431

 
25,786

 
6,992

 
—

 
—

 
—

 
216,090

Mineral interests
629,303

 
—

 
—

 
45,837

 
12,868

 
49,085

 
10,000

 
37,272

 
784,365

Accumulated amortization
(381,686
)
 
—

 
—

 
(19,249
)
 
(11,695
)
 
—

 
—

 
(29,370
)
 
(442,000
)
 
247,617

 
—

 
—

 
26,588

 
1,173

 
49,085

 
10,000

 
7,902

 
342,365

Mining properties, net
$
287,512

 
$
26,986

 
$
116,431

 
$
52,374

 
$
8,165

 
$
49,085

 
$
10,000

 
$
7,902

 
$
558,455


In February 2017, the Company sold the Joaquin silver-gold exploration project for consideration of $27.4 million and a 2.0% NSR royalty on the Joaquin project, which is included in Other. The Company recognized a $21.1 million pre-tax gain on this sale, included in Other, net on the Consolidated Statements of Comprehensive Income.
In July 2017, the Company sold the Endeavor silver stream and our remaining portfolio of royalties to Metalla for total consideration of $13.0 million comprised of $6.3 million of Metalla shares and a $6.7 million convertible debenture. The Company recognized a $1.2 million pre-tax gain, included in Other, net on the Consolidated Statements of Comprehensive Income.