After Nigeria, Kitson continued his explorations in Africa, along with Edmund Thiele, working particularly in the Gold Coast (now Ghana) between 1913–30 where he was first Principal of the Mineral Survey and afterwards Director of the Geological Survey. Kitson travelled round the colony by train and bicycle and discovered sizeable mineral deposits including bauxite and manganese. He discovered Bauxite, the raw material of alumina, in the Atewa Range near Kibi in 1914. The first manganese ore which he discovered was in May 1914 when he found occurrences near the Sekondi-Kumassi Railway about from Tarkwa. These deposits were important to Britain's war effort, as supplies of these minerals from other locations had become difficult. During the last year of the war 32 000 tons of manganese, used in munitions production, were shipped to Britain from the deposits Kitson had found in the Gold Coast. Then in February 1919, together with his colleague E. O. Teale (formerly Thiele), he discovered on the Birim River the first deposits of diamonds to be found in the Gold Coast. The diamonds were of small size but high quality. Kitson observed that they were good crystals showing octahedron and dodecahedron. This proved to be a particularly valuable source of diamonds and the exportation of diamonds grew spectacularly. In 1934 the of diamonds exported from the Gold Coast accounted for 39% of the world's supply that year.