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SUBSEQUENT EVENTS (Details) - Subsequent Event | Jul. 23, 2015 $ / shares | Jul. 06, 2015 USD ($) T
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SUBSEQUENT EVENTS: |  |
Quarterly cash dividend authorized | $ / shares | $ 0.10 |
El Pilar copper deposit |  |
SUBSEQUENT EVENTS: |  |
Consideration paid for acquisition |  | $ 100,000,000
Proven and probable reserves of copper | T |  | 259,000,000
Average copper grade |  | 0.30%
Average annual production of copper cathodes | T |  | 35,000
Mine life with extraction capacity of 35000 tons of copper cathodes |  | 13 years
Development investment |  | $ 300,000,000
Average life of mine cash costs per pound of copper |  | $ 1.60

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