X0303 4 2009-03-25 0 0001001838 SOUTHERN COPPER CORP/ PCU 0001042701 Grupo Mexico, S.A.B. de C.V. CAMPOS ELISEOS NO. 400 COLONIA LOMAS DE CHAPULTEPEC MEXICO CITY, MEXICO O5 11000 MEXICO 0 0 1 0 0001251594 AMERICAS MINING CORP 11811 NORTH TATUM BLVD. SUITE 2500 PHOENIX AZ 85028 0 0 1 0 Common Stock 2009-03-25 4 P 0 200000 17.87 A 679500000 I See Footnote The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $18.49 to $17.42, inclusive. The reporting persons undertake to provide to Southern Copper Corporation, any security holder of Southern Copper Corporation or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnote 1 to this Form 4. Americas Mining Corporation ("AMC") directly owns 679,500,000 shares of Common stock. AMC is owned by Grupo Mexico, S.A.B. de C.V. /s/ Daniel Muniz Quintanilla, Chief Financial Officer of Grupo Mexico, S.A.B. de C.V. 2009-03-26 /s/ Daniel Muniz Quintanilla, Vice-President and Chief Financial Officer of Americas Mining Corporation 2009-03-26