"All leases issued or brought under the provisions of this Act shall, except as otherwise provided in this Act, expire on the thirtieth day of June in the year one thousand nine hundred and forty-three except leases extended in accordance with the provisions of section seventeen and special leases as hereinafter provided. Where an extension of lease has been granted under section fourteen of this Act, the lessee shall surrender his present lease or certificate of confirmation or grant, and a new lease shall be issued to him from the date of such surrender, and such lease as well as every new lease shall contain the covenants, reservations, and exemptions set out in Schedule A hereto, or such of the same as the Minister may deem applicable, and shall be subject to any modifications or additions contained in the notification rendering the lands available for lease in the case of new leases, and as may be determined by the Minister in the case of extended leases or those granted in lieu of leases surrendered under the provisions of this Act, and no lease shall convey any authority to carry on mining operations thereon. Every such lease shall contain a provision to the satisfaction of the Minister for the destruction of rabbits, and any lease shall, in the discretion of the Minister, after report from the Commissioner, be liable to forfeiture for breach of any of the covenants therein contained or annexed by law thereto: