Diavik Diamond Project

RIO TINTO PLC 23 August 1999 Please see the attached, released by Diavik Diamond Mines Inc on Friday 20th August 1999. Diavik Diamonds Project Status Yellowknife, NT (August 20, 1999) - Diavik Diamond Mines Inc. (DDMI), the Manager of the Diavik Diamonds Project, announced today that the feasibility study for the project has reached an advanced stage of completion in anticipation of a decision by the Canadian Minister of Environment with respect to approval of the Comprehensive Study Report issued for the project in June 1999 and has been delivered to the Diavik Diamonds Project joint venture participants. The Comprehensive Study Review process has required more time than originally envisaged to fully take into account the in-depth presentations and analyses submitted during the Comprehensive Study reviews, and inputs from this process have been factored into the Diavik Diamonds Project design and implementation plans. There is no formal timeline associated with the current stages of the Comprehensive Review. However, DDMI believes sufficient progress has been made to allow it to prepare for the upcoming regulatory processes that would follow a positive Ministerial decision. The project implementation plan, to be included with DDMI's upcoming submissions with respect to its water license and land lease applications, calls for construction of project infrastructures in the year 2000, construction of water retention dikes in 2001 and 2002, dewatering and overburden removal in the second half of 2002 and commencement of diamond production in the first half of 2003. DDMI currently estimates costs of C$1.28 billion to bring the project into production. The above-mentioned implementation plan, including commencement of construction activities in the year 2000, is contingent upon approval in sufficient time and implementation of recommendations contained in the Comprehensive Study Report conducted under the Canadian Environmental Assessment Act, receipt of all necessary permits and licences required for construction, and investor approval. The Diavik Diamonds Project is an unincorporated joint venture between DDMI (60%) and Aber Diamonds Mines Ltd. (40%). DDMI is headquartered in Yellowknife, Northwest Territories, and is a wholly owned subsidiary of Rio Tinto plc of London, England. Aber Diamond Mines Ltd is a wholly owned subsidiary of Aber Resources Ltd of Vancouver, British Columbia. For more information, contact Tom Hoefer, Manager of Public Affairs at Tel: +1 867 669 6500.

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