Title: Regulations for the leasing and administration of lands containing limestone, granite, slate, marble, gypsum, marl, gravel, sand, clay, or any building stone, in the provinces of Manitoba, Saskatchewan and Alberta, the Northwest Territories, within twenty miles on either side of the main line of the Canadian Pacific Railway, in the province of British Columbia, in the tract of three and one half (3 1/2) million acres acquired by the government of the Dominion from the province of British Columbia, and referred to in sub-section (b) of section 3 of the Dominion Lands Act, and within the forest reserves and parks as constituted by the Dominion Forest Reserves and Parks Act with the exception of Elk Island and the Buffalo Park Reserve, and the leasing of Dominion lands containing deposits of clay