What are the minerals found at the Tissamaharama wewa?

COLOMBO (News1st): A broad discourse had arisen in the past regarding the Chinese Joint Venture to dredge and clean up the ancient Tissamaharama Wewa. A machine brought down by Chinese nationals was seen separating minerals. This may contain radioactive chemical elements, such as Thorium, which are also used to generate nuclear energy. Perhaps Minister of Irrigation - Chamal Rajapakshe was not aware of such an effort to obtain minerals from the Chinese Joint Venture to dredge and clean up the ancient Tissamaharama Wewa. "There are economically valuable mineral deposits in Sri Lanka," ‪Amila Sandaruwan Ratnayake‬, the head of the Department of Applied Earth Sciences at the Uva Wellassa University said. "Some examples include the Eppawala Phosphate Deposit and the graphite deposits in Bogala and Kahatagaha. We can also observe clay deposits in several parts of the country which are used to manufacture products such as tiles".