The geology of southwestern Ghana is dominated by greenstone belts composed of mafic volcanic rocks and intervening basins typically consisting of fine-grained, deep marine sediments metamorphosed at greenschist facies. Both components are intruded by granitic rocks and separated by major structures. The Sefwi Belt, which hosts the Manfo Project in its north central portion as well as the Ahafo, Bibiani and Chirano gold deposits, is one of the largest and most productive of the Birimian age greenstone belts.
The Manfo Property is underlain primarily by metasediments, volcaniclastics, and small granitoid bodies. A major northeast trending fault corridor, approximately three kilometres wide, traverses the east side of the property. This fault corridor serves as the regional contact between the greenstone volcano-sedimentary package to the west and a regional synvolcanic intrusive to the east. The geochemical targets identified to date lie within this fault corridor. The fault hosts the Bibiani deposit 35 kilometres to the south and is similar in orientation and age to the Kenyasi fault, which hosts gold deposits at Ahafo, 19 kilometres to the north. Gold occurs in structures with sheared and laminated smoky quartz, and with sulphides in sheared, siliceous, carbonate and sericite-rich metasediments.