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STOCKHOLDERS' EQUITY: (Tables) | 6 Months Ended
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Jun. 30, 2017
STOCKHOLDERS' EQUITY: |
Schedule of activity in treasury stock | Activity in treasury stock in the six-month period ended June 30, 2017 and 2016 is as follows (in millions):
|  | 2017 |  | 2016 |
Southern Copper common shares |  |  |  |  |
Balance as of January 1, |  | $ | 2,769.0 |  | $ | 2,697.6 |
Purchase of shares |  | — |  | 53.7 |
Used for corporate purposes |  | (0.3 | ) | (0.3 | )
Balance as of June 30, |  | 2,768.7 |  | 2,751.0 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Balance as of January 1, |  | 218.6 |  | 211.3 |
Other activity, including dividend, interest and foreign currency transaction effect |  | 4.3 |  | 4.7 |
Balance as of June 30, |  | 222.9 |  | 216.0 |
Treasury stock balance as of June 30, |  | $ | 2,991.6 |  | $ | 2,967.0 |
Schedule of share distributions |
|  | 2017 |  | 2016 |
Southern Copper common shares |  |  |  |  |
Directors’ Stock Award Plan |  | 10,800 |  | 12,000 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Employee stock purchase plan (shares in millions) |  | 0.3 |  | 0.6 |
Schedule of activity in Directors' Stock Award Plan |
|  | 2017 |  | 2016 |
Total SCC shares reserved for the plan |  | 600,000 |  | 600,000 |
Total shares granted at January 1, |  | (334,800 | ) | (322,800 | )
Granted in the period |  | (10.800 | ) | (12,000 | )
Total shares granted at June 30, |  | (345,600 | ) | (334,800 | )
Remaining shares reserved |  | 254.400 |  | 265,200 |
Summary of non-controlling interest activity |
|  | 2017 |  | 2016 |
Balance as of January 1, |  | $ | 38.6 |  | $ | 36.3 |
Net earnings |  | 1.6 |  | 1.3 |
Dividend paid |  | (0.3 | ) | — |
Balance as of June 30, |  | $ | 39.9 |  | $ | 37.6 |
Employee Stock Purchase 2010 Plan |
STOCKHOLDERS' EQUITY: |
Schedule of stock based compensation expense and unrecognized compensation expense | The stock based compensation expense for the first six months 2017 and 2016 and the unrecognized compensation expense under this plan were as follows (in millions):
|  | 2017 |  | 2016 |
Stock based compensation expense |  | $ | 0.3 |  | $ | 0.3 |
Unrecognized compensation expense |  | $ | 0.5 |  | $ | 1.0 |
Schedule of stock award activity |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2017 |  | 1,401,096 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | (7,433 | ) | 2.05 |
Forfeited |  | — |  | — |
Outstanding shares at June 30, 2017 |  | 1,393,663 |  | $ | 2.05 |
Outstanding shares at January 1, 2016 |  | 2,227,582 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | (605,371 | ) | $ | 2.05 |
Forfeited |  | — |  | — |
Outstanding shares at June 30, 2016 |  | 1,622,211 |  | $ | 2.05 |
Employee Stock Purchase 2015 Plan |
STOCKHOLDERS' EQUITY: |
Schedule of stock based compensation expense and unrecognized compensation expense | The stock based compensation expense for the first six months of 2017 and 2016 and the unrecognized compensation expense under this plan were as follows (in millions):
|  | 2017 |  | 2016 |
Stock based compensation expense |  | $ | 0.3 |  | $ | 0.3 |
Unrecognized compensation expense |  | $ | 3.5 |  | $ | 4.2 |
Schedule of stock award activity |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2017 |  | 2,540,223 |  | $ | 2.63 |
Granted |  | — |  | — |
Exercised |  | (248,992 | ) | 2.63 |
Forfeited |  | — |  | — |
Outstanding shares at June 30, 2017 |  | 2,291,231 |  | $ | 2.63 |
Outstanding shares at January 1, 2016 |  | 2,656,386 |  | $ | 2.63 |
Granted |  | — |  | — |
Exercised |  | (13,997 | ) | $ | 2.63 |
Forfeited |  | — |  | — |
Outstanding shares at June 30, 2016 |  | 2,642,389 |  | $ | 2.63 |

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