Guwahati, April 21: The Garo Students Union (GSU) has opposed the proposal of the department of atomic energy to mine uranium at the Balpakram National Park in South Garo Hills district of Meghalaya. In a memorandum to Union minister of environment and forests Jairam Ramesh on Wednesday, the GSU said the department had applied to the National Board of Wildlife for permission to start exploratory drilling in Balpakram, which is a precursor to mining.