Cambior: Notice.

Business Editors

LONGUEUIL, Quebec--(BUSINESS WIRE)--May 23, 2003

Cambior Inc. confirms that it has been made aware of the filing of a class action suit in Guyana claiming total compensation of approximately US $2 billion for damages allegedly caused by the Omai gold mine in Guyana in 1995. The action has apparently been filed on behalf of the same group of people that previously filed actions without success in both Quebec and Guyana.

Omai Gold Mines Limited (OGML) has a rigorous and extensive water monitoring program which demonstrates full compliance with environmental regulations in Guyana based on Canadian and American standards. Furthermore, Guyana's Environmental Protection Agency (EPA) and the Guyana Geology and Mines Commission (GGMC) also ensure independent monitoring of OGML's compliance regarding the Essequibo River. Their findings confirm OGML's results.

OGML's environmental management system is certified under the ISO 14001 standard, a system developed by international experts under the auspices of the International Standard Organization based in Switzerland. As part of the certification process, the system is regularly audited by SGS, an independent world-leading certification organization.

Cambior and OGML consider this action as unfounded and frivolous and will contest it vigorously.

Cambior Inc. is an international gold producer with operations, development projects and exploration activities throughout the Americas. Cambior's shares trade on the Toronto (TSX) and American (AMEX) stock exchanges under the symbol "CBJ". Cambior's warrants, "CBJ.WT.B", trade on the TSX.