Gem mining in Seethawaka river has been taken over by the Sri Lankan government, National Gem and Jewellery Authority (NGJA). According to Director General Janaka Udaya Kumara, this decision was taken to prevent illegal gem mining in the Thalduwa area of Seethawaka river. Read more in this October 2013 edition of the Monthly Sri Lanka State of the Environment Report published by the South Asia Environment Portal. Read and Share.