After the purchase by the feds and the establishment of the State, it was part of the constitution. No private ownership of land.
Keep in mind that when Alaska became a state it was already into oil production in the Cook Inlet Area and the Naval Petroleum Reserve had already been established on the North Slope. The governments didn’t want to give away the resources they already paid to get. Remember Alaska was purchased from the Russians for the purpose of producing resources; it just wasn’t expected to be oil at that time.
Sorry, no private ownership of oil/gas mineral rights on private land.