Show may stop mining coal des Al otties la A complete shut down of the coal mines in iowa m aik oik ed by 15 miners Is threatened the agreement now existing between the mine operators and the miners expires march 31 and because of the failure of the miners and operators opra op gators tors in eastern states to reach an agree ment list week it Is probable that the miners and operators who have heretofore followed the example of the eastern states will not be able to 0 make a new agreement beford march 11 |