Guinea possesses over 25 billion tonnes (metric tons) of bauxite – and perhaps up to one-half of the world's reserves. In addition, Guinea's mineral wealth includes more than 4-billion tonnes of high-grade iron ore, significant diamond and gold deposits, and undetermined quantities of uranium. Possibilities for investment and commercial activities exist in all these areas, but Guinea's poorly developed infrastructure and rampant corruption continue to present obstacles to large-scale investment projects.