1901.- Asarco begins operations in Mexico.

1965.- Asarco is reorganized to form Asarco Mexicana with 51% Mexican Ownership.

1974.- Asarco Mexicana changed its name to Industrial Minera Mexico (IMMSA) and Asarco (USA) ownership change to a holding of 34% participation.

1978.- Grupo Industrial Minera Mexico (GIMMEX) is created by the Mexican controlling group and is listed on the Mexican Stock Exchange (GIMMEX).

1980.- Construction of a new Zinc Refinery of 106,000 metric tons per year, with a $200 MM USD investment. Started operations in 1982.

1988.- In a public biding, 95% of Mexicana de Cobre is acquired from the Mexican government and private partners related to GIMMEX by an amount $690 MM USD.

1989.- Expansion of Mexicana de Cobre, Concentrator from 70,000 to 90,000 metric tons of ore per day.

1990.- In a public auction, 100% of Cananea Mine, Sonora is acquired from the Mexican government by a consortium formed by Mexicana de Cobre (76%) and Acec Union Miniere (24%) for an amount of $525 MM USD, with the commitment to invest additional $400 MM USD.

1990-1994.- 474 MM USD program dedicated to mine stripping, modernization and new equipment for the Cananea, Sonora complex.

1994.- GMEXICO is created and listed in the Mexican Stock Exchange replacing GIMMEX.

1995.- Construction of a 22,000 Tons., of cathodes per year new SX/EW plant in La Caridad, Sonora unit which represented 50 MM USD investment.

Expansion of the Concentrator Plant of Cananea, Sonora from 60,000 to 80,000 metric tons of ore per day.

1996.- Expansion of La Caridad, Sonora Smelter from 180,000 to 300,000 metric tons, of anodes per year, in compliance with international environmental regulations. With an additional Investment of 150 MM USD.

1997.- Was posible a 100% integration of copper process through the construction at Refinery in La Caridad, Sonora with a production of 300,000 metric tons per year copper refined; within an investment of 175 MM USD.

GMEXICO acquires the 24% of Cananea Mine, Sonora from Acec Union Miniere due to the termination of the copper commercial concentrates contract.

In a public auction, GMEXICO (74%) in association with Union Pacific (13%) and ICA (13%), acquires for 575 MMD the concession of the North-Pacific, Chihuahua-Pacifico and the short line Nogales-Cananea railroad lines and is created Grupo Ferroviario Mexicano (GFM) with its subsidiary Ferrocarril Mexicano, S.A. de C.V. (Ferromex). Three months later, Union Pacific acquires the ICA portion of the GFM´s ownership.

1998.- A 150,000 metric tons per year Rod Plant was built in La Caridad, Sonora Complex.

A new Precious Metals Refinery of 15 million of silver ounces and 100 thousand ounces of gold per year was built in Sonora, Mexico.

1999.- GMEXICO acquires all of the outstanding common stock of Asarco Incorporated controlling, by this 54.2% in Southern Peru Copper Corporation, a Delaware company listed in the NYSE. This 2.5 billion dollar acquisition makes GMEXICO the second largest copper company in terms of copper reserves, the third largest producer of copper and fourth largest producer of silver in the world.

2000.- Expansion and Modernization of Cuajone, Perú Concentrator from 60,000 to 100,000 metric tons,of ore per day within an investment more than 200 MMD.

2001.- Torata, Peru Project within an investment of 80 MMD. Optimization and expansion of the Cuajone, Peru mine increasing its reserves from 10 to 40 years.

2002.- Expansion of Cananea, Sonora SX-EW refineries from 33,000 to 87,000 metric tons, of cathodes/per year.

2003.- Expansion of the Toquepala, Peru concentrator from 42,000 to 60,000 metric tons of ore per day, within and investment of 60 MMD.

2004.- Building a new smelter in Ilo, Peru for 1.2 million of concentrates, complying with Peruvian and international environmental regulations, should be in operation by 2007.