ISAPRE RÍO BLANCO LTDA.
December 31st, 2006

Legal Status
Company name: Isapre Río Blanco Limitada
RUT: 89.441.300-K
Legal status: Limited liability company
Capital subscribed and paid in
As of 31 December 2006, Capital subscribed and paid in by Codelco: US$1,009,000.

Purpose
Health care institution (Isapre)

Board of Directors
María Elena Etcheberry Court, President
Daniel Trivelli Oyarzún, Official Director (*)
Héctor Cáceres Vicencio, Official Director (*)
Marcos Vergara Iturriaga, Vice-president
Álvaro Covarrubias Risopatrón, Official Director
Leonardo Whittle Ferrer, Attending Director (*)
Manuel Opazo Mortola, Attending Director (*)

Executives
Jaime Del Solar Zorzano, General Manager
Vilma Olave Garrido, Medical Director
María Eugenia Villarroel Villarroel, Administrative and financial Vice-manager

Codelco's share of capital and changes during the fiscal year
Codelco Chile Division Andina: 99.99%
Isapre San Lorenzo Ltda.: 0.01%

Commercial relations with Codelco.
The Andina Division has assigned responsibility to this Isapre for providing workers and ex-workers of the Andina Division covered by severance plans, and their registered dependents with health care benefits, including medical, pharmaceutical and dental benefits offered in the health care plans approved during collective bargaining and forming part of labour contracts, which are not financed by the workers' contribution established by law.

Andina division has been obliged through contracts and/or agreements signed with its workers, to finance its workers and their families, legal health services when signing a Division Working Contract and report a health legal estimate at Isapre Río Blanco. Likewise it has been obliged to provide ex-workers of the Andina Division covered by severance plans, and their registered dependents with health care benefits, including medical, pharmaceutical and dental benefits offered by the internal health regulations for the time limit established by the same severance plan.

The contribution of the Division completes the health care estimate that is obligatory to each and every worker, when the price of the health care plan of the Isapre cannot be fully covered by the worker. Therefore, Andina division entrusts the Isapre Río Blanco Ltda, the financing of the services, according to the health care plans conditions that the Isapre holds.

Contracts with Codelco
Contract Nº 4500435902, for providing health care to workers, former workers and their dependents.

Investment as a percentage of total head office
2006 Investment in subsidiary US$1,927,000.
2005 Investment in subsidiary US$1,952,000.
Total investment as a percentage of head office assets: 0,015%, 2006.