| Reference | {Deposit:: RAMP, LEN, 1972, GEOLOGY AND MINERAL RESOURCES OF DOUGLAS COUNTY, OREGON: OREGON DEPT. GEOLOGY AND MINERAL IND. BULL. 75, 106 P.}{Deposit:: RAMP, LEN, 1961, CHROMITE IN SOUTHWESTERN OREGON: OREGON DEPT. GEOLOGY AND MINERAL IND. BULL. 52, 169 P.}{Deposit:: THAYER, T. P., 1974, UNPUBL. DATA}{Production:: ANNUAL TABLE FROM THAYER; CUMULATIVE ESTIMATE BY RAMP TO BE 450 TONS 1954-55 OF MASSIVE & LOW GRADE, FROM DAVIS CL.} |