CMS TECNOLOGIA S.A.
December 31st, 2006

Legal status
CMS Tecnología S.A. is a private limited company, set up 1 July 1999.

Capital subscribed and paid in
In October 2005, Codelco Chile sold 70% of this company to ABB Services S.A. (Asea Brown Bovery). As of 31 December 2006, the capital subscribed and paid in by Codelco Chile stood at US$3,947, 000.

Purpose
The purpose of this company is to provide integrated maintenance services to productive units, machinery and mining equipment in the main locations where large-scale mining is occurring in northern and central Chile. With the inclusion of ABB Services S.A. in October 2005 as the controlling partner, the business strategy has focused on incorporating the "Full Service Contract" concept in the field of integrated Plant Management, with its central purposein Chile being the provision of copper mining services.
Board of Directors
Enrique Daniel Rohde
Gustavo Renom Molina
Patricio Huencho Montecinos
Héctor Hip Soto (*)
José Robles Becerra (*)

General Manager
Paulo Cerqueira

Codelco's share of capital and changes during the fiscal year
Codelco Chile holds a 30% stake in CMS Tecnología SA

Contracts in effect with Codelco
At the moment, CMS has the following contracts with Codelco:
Radomiro Tomic: General mechanical maintenance service,tire repair and maintenance service.
Chuquicamata: electro-mechanical maintenance service, crusher work centre superintendence.
Andina: General mechanical maintenance and replacement parts contract as needed by mills and crushers.
Maintenance and industrial cleaning at the Sewell plant.

Investment as a percentage of total head office
2006 Investment in jointly held firm US$1,794,000.
2005 Investment in jointly held firm US$1,448,000.
Total investment as a percentage of head office assets 0.014%, 2006.