Show coil coal mine under the sea coal Is being mint mined d under the sea on the he north coast of the spanish province 0 v ince of As aa turia s A seam Is opened there ave r e which extends an unknown distance the working now being in feet the mine is reached by a vert icle shaft whose surface la Is sixty five feet above the sea and the bottom ak feet below it with the necessary machinery room after room Is 18 opened 7 in succession slices ten feet long are taken out and when the full thickness of the seam has been removed the roof Is made secure by building a dry stone wall from three to five feet thick 1 against the pillar of coal left standing the space a ce behind Is packed eked solid with stone atone for timber ber Is of efge the question in anch a thick seam each miner digs from two and one half to three tons per day |