The main purposes were to record , mark and gather mine information to plan an effective demining operation , as well as to reduce and recheck the suspected mine/UXO contaminated areas identified by the LIS to make sure that they are more precise and unambiguous . An April to October 2007 survey conducted by Humanitarian Mine Action Unit I ( HMAU I ) under the direction of TMAC , released 32.02 square kilometres and identified 9.19 square kilometres of actual mined area from an original total 41.21 square kilometres of suspected mined area .