EE WAS CARRYING A 2'X2' PATIO BLOCK ACROSS THE DECK OF AN OVERCAST. THE DECK WAS BUILT OF PATIO BLOCK ALSO. HE STEPPED ON A PATIO BLOCK THAT EVIDENTLY HAD A CRACK. IT LET GO AND HE FELL THROUGH THE DECK 4' TO THE MINE BOTTOM. IN THE FALL HE WENT AGAINST OTHER PATIO BLOCK AND A 4"" H-BEAM CAUSING THE INJURY.