(1) An overlapping authority, for a GHG authority, is any authority of the following types all or part of the area of which is in the GHG authority's area--
(a) an exploration authority (non-GHG);
(b) a petroleum lease;
(c) a mining lease.
(2) An overlapping authority, for a proposed GHG authority, is another authority of a type mentioned in subsection (1) (the other authority) all or part of the area of which will if the proposed GHG authority is granted be in the other authority's area.