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STOCKHOLDERS' EQUITY: (Tables) | 6 Months Ended
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Jun. 30, 2018
STOCKHOLDERS' EQUITY: |
Schedule of activity in treasury stock | Activity in treasury stock in the six-month period ended June 30, 2018 and 2017 is as follows (in millions):
|  | 2018 |  | 2017 |
Southern Copper common shares |  |  |  |  |
Balance as of January 1, |  | $ | 2,768.7 |  | $ | 2,769.0 |
Purchase of shares |  | — |  | — |
Used for corporate purposes |  | (0.4 | ) | (0.3 | )
Balance as of June 30, |  | 2,768.3 |  | 2,768.7 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Balance as of January 1, |  | 232.4 |  | 218.6 |
Other activity, including dividend, interest and foreign currency transaction effect |  | 8.4 |  | 4.3 |
Balance as of June 30, |  | 240.8 |  | 222.9 |
Treasury stock balance as of June 30, |  | $ | 3,009.1 |  | $ | 2,991.6 |
Schedule of share distributions |
|  | 2018 |  | 2017 |
Southern Copper common shares |  |  |  |  |
Directors’ Stock Award Plan |  | 16,000 |  | 10,800 |
Parent Company (Grupo Mexico) common shares |  |  |  |  |
Employee stock purchase plan (shares in millions) |  | 1.3 |  | 0.3 |
Schedule of activity in Directors' Stock Award Plan |
|  | 2018 |  | 2017 |
Total SCC shares reserved for the plan |  | 600,000 |  | 600,000 |
Total shares granted at January 1, |  | (345,600 | ) | (334,800 | )
Granted in the period |  | (16,000 | ) | (10.800 | )
Total shares granted at June 30, |  | (361,600 | ) | (345,600 | )
Remaining shares reserved |  | 238.400 |  | 254.400 |
Summary of non-controlling interest activity |
|  | 2018 |  | 2017 |
Balance as of January 1, |  | $ | 41.7 |  | $ | 38.6 |
Net earnings |  | 2.6 |  | 1.6 |
Dividend paid |  | (0.9 | ) | (0.3 | )
Balance as of June 30, |  | $ | 43.4 |  | $ | 39.9 |
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 2018 and 2017 and the unrecognized compensation expense under this plan were as follows (in millions):
|  | 2018 |  | 2017 |
Stock based compensation expense |  | $ | 0.2 |  | $ | 0.3 |
Unrecognized compensation expense |  | $ | — |  | $ | 0.5 |
Schedule of stock award activity |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2018 |  | 1,393,663 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | (1,246,753 | ) | 2.05 |
Forfeited |  | — |  | — |
Outstanding shares at June 30, 2018 |  | 146,910 |  | $ | 2.05 |
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 |
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 2018 and 2017 and the unrecognized compensation expense under this plan were as follows (in millions):
|  | 2018 |  | 2017 |
Stock based compensation expense |  | $ | 0.3 |  | $ | 0.3 |
Unrecognized compensation expense |  | $ | 2.9 |  | $ | 3.5 |
Schedule of stock award activity |
|  | Shares |  | Unit Weighted Average Grant Date Fair Value |
Outstanding shares at January 1, 2018 |  | 2,293,120 |  | $ | 2.63 |
Granted |  | — |  | — |
Exercised |  | (49,320 | ) | 2.63 |
Forfeited |  | — |  | — |
Outstanding shares at June 30, 2018 |  | 2,243,800 |  | $ | 2.63 |
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 |

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