SDCL § 5-2-7: Rules and conditions governing sand and gravel contracts.

The commissioner of school and public lands is authorized and directed to make and publish all necessary and proper rules, terms, and conditions for the taking, purchasing, or selling of the materials and the products mentioned in § 5-2-5, and to make such changes from time to time, upon proper notice, as the rights of the state and interest of the public may require.