(mining) Loose fragments (often of metal ore) mixed with earth.
Origin of shoad
From Middle English shode, schode, from Old English *(ġe)scād, ġescēad (“separation, distinction, discretion, understanding, argument, reason, reckoning, account, statement, accuracy, art, manner, method”), from Proto-Germanic *skaidą (“separation, distinction”), from Proto-Indo-European *skÁit-, *skÁi- (“to cut, divide, separate”). Related to Old English scādan (“to separate, divide, part, make a line of separation between”). More at shed.