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An investigation of the fatal roof fall accident that occurred on August 2 , 2004 , determined that the approved Roof Control Plan , dated April 7 , 2004 , was not being complied with in the No. 2 entry on the 001 Mechanized Mining Unit ( MMU ) . Timeline of the History of Coal Mining - - a listing of important dates in the Illinois coal industry broken into 3 categories : Mine Disasters , Regulatory History and Landmarks in Illinois Coal Mining History . The Data Mining Form is an opportunity for you to explore Data Mining related issues , share ideas and discuss industry standards and trends with your peers . Coal is produced on the 001-0 Mechanized Mining Unit ( MMU ) on the day and evening shifts . Excavations at Tintic , the main western rail connection to the Tintic Mining district , focused on three section station houses and also a possible Japanese occupation . Mr. Johnson has over 35 years experience in the Canadian Mining industry , primarily in the coal sector where he was instrumental in initiating the largest coal mine development in recent times . An investigation of the fatal fall of roof accident that occurred on August 2 , 2004 , determined that the day shift foreman who conducted the pre-shift examination failed to properly record the results of his examination of the 001 Mechanized Mining Unit ( MMU ) .