Lands are let for mining for minerals and metals, other than gold, in blocks [unclear: as] greater than 040 acres, for periods not exceeding ninety-nine years, at the annual [unclear: rent] of 1s. per acre, and a further sum of 6d. in the pound sterling on the net profits of [unclear: the] mine. Leases discoverers of coal, guano, petroleum, or other valuable deposits [unclear: may] be granted by the Governor on such terms as he may see fit.