Minimal surface exploration work was carried out on the Obuasi property prior to the involvement of Randgold Resources Limited ("Randgold") in 2004. On the Kyereboso No. 2 and No. 3 concessions, Randgold completed reconnaissance geological mapping, prospecting, soil sampling and trenching to investigate the projected strike extension of the main trend of the Obuasi mine onto the property. In 1991-92, at the Meduma concession, Centracor Mining Ltd. carried out ground geophysical surveys, soil sampling, and trenching, and completed seven shallow drill holes. The best reported assays were 1.7 g/t gold over 6 metres and 1.5 g/t gold over 4 metres. Subsequent work on the Meduma concession was minimal.