The Asante Akim South District is covered by varied types of rocks. These are from mainly Dahomeyan and Birrimean origin and are basically phyllites granites and Tarkwaian sandstones over which the soils are developed. The phyllites consist of the Upper and Lower Birrimean rocks. The Upper Birrimean rocks consists of charts metamorphosed lava and tuffs; grewacke and epidiorite. The lower Birrimean rocks consist of phyllites, grewackes , schists and genesis.
The granite rocks extending from Yawkwei through Juaso, Obogu,and Banso are suitable for road and building construction. Currently 2 companies are extracting granite chippings for the construction of road throughout the country. There still exists deposit of granite rocks calling for quarry investment. Gold are being prospected at Bankame, Banso and Dwendwenase area. Mining is being done at Banka.