Rio Tinto will spend $1.2 million to assess uranium mineralisation at West Perth-based Zambezi Resources Ltd's Mulofwe prospect in Zambia, and may spend $5.9 million to earn a 51 per cent stake in the project, Zambezi has announced.

Rio Tinto will spend $1.2 million to assess uranium mineralisation at West Perth-based Zambezi Resources Ltd's Mulofwe prospect in Zambia, and may spend $5.9 million to earn a 51 per cent stake in the project, Zambezi has announced.