| 1. |  | Plan of underground workings, Volney No. 1, Tinton, S. Dak., owned by Black Hills Tin Company | Mineral Industries -- Black Hills (S.D. and Wyo); | Note: the underground workings outlined by the dashed lines have an average clearance of 6 1/2 ft. between floor & ceiling. All workings are in the same level.; Tinton; T52N, R01E, Sec 30 |
