On 9 March 2009, Rio Tinto announced it had reached an agreement to sell Jacobs Ranch to Arch Coal for a total cash consideration of US$761 million.

About Jacobs Ranch Mine

Jacobs Ranch mine, located approximately 55 miles south of Gillette, Wyoming, extracts steam coal from the Wyodak Seams, using dragline and truck-and-shovel methods. Two products are produced from the Jacobs Ranch mine with varying sulphur content. The mine shipped 42.1million tons of coal in 2008 with an estimated average as delivered heat value of approximately 8,800 Btu, ash content of 5.4% and sulphur content of 0.45% (1.0lbs SO2/mmBtu). Jacobs Ranch had approximately 381million tons of proven and probable reserves at December31, 2008.

About Rio Tinto

Rio Tinto is a leading international mining group headquartered in the UK, combining Rio Tinto plc, a London and NYSE listed company, and Rio Tinto Limited, which is listed on the Australian Securities Exchange.

Rio Tinto's business is finding, mining, and processing mineral resources. Major products are aluminium, copper, diamonds, energy (coal and uranium), gold, industrial minerals (borax, titanium dioxide, salt, talc) and iron ore. Activities span the world but are strongly represented in Australia and North America with significant businesses in South America, Asia, Europe and southern Africa.

About Arch Coal, Inc.

St. Louis-based Arch Coal is a publicly traded company on the New York Stock Exchange, and one of the largest coal producers in the United States. Arch focuses on high-quality, low-sulphur thermal coal deposits and supplies coal from 11 mining complexes in Wyoming, Utah, Colorado, West Virginia, Kentucky, and Virginia prior to this acquisition.

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