GEOLOGY AND COAL DEPOSITS IN PART OF THE COOS BAY COAL FIELD, OREGON By DONALD C. DUNCAN ABSTRACT Coal in the Coos Bay field, southwest Oregon, was an important source of fuel along the western seaboard of the United States from about 1855 to the early 1920's when the largest operating mine in the field was closed. In an effort to
Coal mining study pp 158207 (PDF, , 50 pp.) Kenny, JPL 'Benwerrin Brown Coal Mine', Mining and ... Drawing /2 Deans Marsh mine plan and cross section of underground workings at 1950 (from Thomas and Baragwanath, ..... westerly from the mouth of the Werribee River – it may.