the Minister, after consulting with the Advisory Board and being of the opinion that it is necessary to do so for the better management of Crown Lands, may, with the approval of the Lieutenant-Governor in Council, reduce the Crown Lands described in the license sufficiently to secure to the sub-licensee the proportion of annual allowable cut that has been allocated by the Minister to the sub-licensee and is specified in his sub-license, and declare the sub-license to be cancelled.