The private contracting party or parties shall enjoy the right of easement over state forestlands and state lands included under said cooperative agreement for railway, road, and other uses necessary to the carrying out of the agreement. This easement shall be only for the life of the cooperative agreement and shall be granted without charge with the provision that payment shall be made for all merchantable timber cut, removed, or damaged in the use of such easement, payment to be based on the contract stumpage price for timber of like value and species and to be made within thirty days from date of cutting, removal, and/or damage of such timber and appraisal thereof by the department.