Sec. 5. (a) A proposal or bid made in response to a request under section 4 of this chapter must offer the following:
(1) A royalty on a percentage basis, based on the commodity value at the mine, pit, or quarry.
(2) A bonus, or fixed fee per acre, in addition to royalty.
(b) A royalty may not be less than that generally prevailing for the resource to be extracted under similar methods of mining.