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STOCKHOLDERS' EQUITY: (Tables) | 9 Months Ended
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Sep. 30, 2018
STOCKHOLDERS' EQUITY: |
Schedule of activity in treasury stock |
|  | 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 September 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 |  | 17.3 |  | 9.4 |
Balance as of September 30, |  | 249.7 |  | 228.0 |
Treasury stock balance as of September 30, |  | $ | 3,018.0 |  | $ | 2,996.7 |
Schedule of share distributions | The following table summarizes share distributions in the nine months of 2018 and 2017:
|  | 2018 |  | 2017 |
Southern Copper common shares |  |  |  |  |
Directors’ Stock Award Plan |  | 16,000 |  | 12,000 |
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, |  | (346,800 | ) | (334,800 | )
Granted in the period |  | (16,000 | ) | (12,000 | )
Total shares granted at September 30, |  | (362,800 | ) | (346,800 | )
Remaining shares reserved |  | 237.200 |  | 253,200 |
Summary of non-controlling interest activity |
|  | 2018 |  | 2017 |
Balance as of January 1, |  | $ | 41.7 |  | $ | 38.6 |
Net earnings |  | 3.9 |  | 2.6 |
Dividend paid |  | (1.2 | ) | (0.6 | )
Balance as of September 30, |  | $ | 44.4 |  | $ | 40.6 |
Employee Stock Purchase 2010 Plan |
STOCKHOLDERS' EQUITY: |
Schedule of stock based compensation expense and unrecognized compensation expense | The stock based compensation expense for the nine 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 |  | $ | 0.4 |
Unrecognized compensation expense |  | $ | — |  | $ | 0.4 |
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 |  | (1,263,136 | ) | 2.05 |
Forfeited |  | — |  | — |
Outstanding shares at September 30, 2018 |  | 130,527 |  | $ | 2.05 |
Outstanding shares at January 1, 2017 |  | 1,401,096 |  | $ | 2.05 |
Granted |  | — |  | — |
Exercised |  | (7,433 | ) | 2.05 |
Forfeited |  | — |  | — |
Outstanding shares at September 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 nine months of 2018 and 2017 and the unrecognized compensation expense under this plan were as follows (in millions):
|  | 2018 |  | 2017 |
Stock based compensation expense |  | $ | 0.4 |  | $ | 0.4 |
Unrecognized compensation expense |  | $ | 2.8 |  | $ | 3.4 |
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 |  | (306,817 | ) | 2.63 |
Forfeited |  | — |  | — |
Outstanding shares at September 30, 2018 |  | 1,986,303 |  | $ | 2.63 |
Outstanding shares at January 1, 2017 |  | 2,540,223 |  | $ | 2.63 |
Granted |  | — |  | — |
Exercised |  | (248,992 | ) | 2.63 |
Forfeited |  | — |  | — |
Outstanding shares at September 30, 2017 |  | 2,291,231 |  | $ | 2.63 |

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