This publication is a compilation of seven papers from a workshop organisedby the Darwin Branch of The AusIMM covering the subject of ore reservereconciliation. The workshop concentrated on the methods of operating andpractises used in ore reserve grade control and sample preparation in thefollowing Northern Territory mining operations: Union Reefs Gold Mine WhiteDevil Mine The Granites Gold Mine Ranger Mine Woodcutters Mine and McArthurRiver Mine.