case 1:
          event.setCancelled(true);
          block.setType(Material.AIR);
          block.getWorld().dropItem(block.getLocation(), new ItemStack(Material.IRON_INGOT));
          break;
        case 2:
          event.setCancelled(true);
          block.setType(Material.AIR);
          block.getWorld().dropItem(block.getLocation(), new ItemStack(Material.GOLD_INGOT));
          break;
        case 3:
          event.setCancelled(true);
          block.setType(Material.AIR);
          block.getWorld().dropItem(block.getLocation(), new ItemStack(Material.GLASS));
          break;
        case 4:
          event.setCancelled(true);
          block.setType(Material.AIR);
          block.getWorld().dropItem(block.getLocation(), new ItemStack(Material.STONE));