CA Fish & Game Code Section 1500.5

With respect to exchanging or selling any property pursuant to Section 1500, the director, with respect to any parcel containing 15 acres or less, shall except and reserve to the state all mineral deposits, as defined in Section 6407 of the Public Resources Code, below a depth of 500 feet, without surface rights of entry. As to any parcel containing more than 15 acres, the director shall except and reserve to the state all mineral deposits, as defined in Section 6407 of the Public Resources Code, together with the right to prospect for, mine, and remove the deposits. The rights to prospect for, mine, and remove shall be limited to those areas of the property conveyed which the director, after consultation with the State Lands Commission, determines to be reasonably necessary for the removal of the resources and deposits.