For the purpose of information and to assist the supervisor of reclamation in proper enforcement of rules promulgated under this part, an operator shall file with the supervisor of reclamation a plan map in the form determined by the supervisor of reclamation showing all existing mining areas or areas subjected to mining by the operator. Annually thereafter, on or before March 15, the operator shall file a plan map in similar form showing any changes made during the preceding calendar year and the mining area that the operator anticipates will be subjected to mining during the current calendar year. The supervisor of reclamation periodically shall ascertain the long-range land environment plans of the operator.