Where the same person or company or association is operating two (2) or more mining claims under one (1) general system of mining or development, the product of which group of mines is mingled and treated as one (1) mining operation, the statement of the owner provided herein to be made, and the assessment provided herein to be made by the assessor, shall be made as to such entire group, and need not be made as to each particular mining claim constituting said group.