PRE-INSPECTIONS COMPLETED PRIOR TO SHIFT. UPON COMPLETION EE CALLED TO HOISTMAN TO REPORT THAT HE HEARD DEBRIS COMING DOWN THE NORTH SKIP COMPARTMENT ON THE 4850 LEVEL. SHAFTMAN CONTACTED TO INVESTIGATE. ON 4550 LEVEL, THE CREW NOTED THAT A 12'LACING HAD COME LOOSE (POSSIBLY DUE TO RECENT FREEZING & THAWING CONDITIONS.)HOIST OPERATOR CONTACTED TO DEMARCATE ON THE HOIST.