Decision comes after the companies received Wednesday a preliminary geological assessment of the property, which shows Heritage contains several targets for modern alluvial diamond placer deposits.
Overall project engineering at the 270,000 ounce-a-year Guyere gold project, which is already more than A$100 million over its original budget of A$507 million, is now 96 percent complete
The East African nation's deposits are often in remote regions where the country's poorest live, but experts say few have reaped the rewards from mining.