Keystone

U.S. BUREAU OF MINES, 1965, MERCURY IN WASHINGTON, IN MERCURY POTENTIAL OF THE UNITED STATES: U.S. BUREAU OF MINES INFORMATION CIRCULAR 8252, P. 366BAILEY, E.H., U.S. GEOLOGICAL SURVEY, PERSONAL FILESHUNTTING, M.T., 1956, INVENTORY OF WASHINGTON MINERALS - PART II, METALLIC MINERALS: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 37, V. 1, P. 264.HILL, J.B., AND MELROSE, J.W., 1941, DIRECTORY OF WASHINGTON METALLIC MINING PROPERTIES: WASHINGTON DIVISION OF MINES AND MINING INFORMATION CIRCULAR 7, 74 P.HODGES, K.L., 1897, MINING IN THE PACIFIC NORTHWEST: SEATTLE POST INTELLIGENCER, 116 P.TABOR, R.W., WAITT, R.B., JR., FRIZZELL, V.A., JR., SWANSON, D.A., BYERLY, G.R., AND BENTLEY, R.D., 1982, GEOLOGIC MAP OF THE WENATCHEE 1:100,000 QUADRANGLE, CENTRAL WASHINGTON: U.S. GEOLOGICAL SURVEY MISCELLANEOUS GEOLOGIC INVESTIGATIONS MAP I-1311, SCALE 1:100,000.CLE ELUM MAP NO. 70 (Not clear if this is in the HODGES, 1897 publication or something separate.)