Quartz pebble conglomerate uranium deposits are typically low grade but characterized by high tonnages. The RVNAF had contributed 682 missions with unknown ordnance tonnages. Minor tonnages of nickel were recovered as a byproduct of cobalt operations in Morocco. Bricks from Allt-yr-yn Brickworks were later important but in relatively small tonnages. The U-boat fleet sank large tonnages of Allied shipping, both warships and merchant ships. Her tonnages were , and 12,228 tons under deck. Still in use today, Mahone's design withstands immense tonnages of coal traffic through the swamp. Brigs vary in length between with tonnages up to 480. Small tonnages of xenotime sand are recovered in association with Malaysian tin mining, etc. The vessel's new gross and net tonnages was 465.66 and 183.78 respectively. However, the gross and net register tonnages are still widely used in describing older ships. The tonnages suggest a varying performance between sectors in the wider Northern Ireland economy. Tonnages increased following World War 2, but declined from the 1970s. Smaller raids are not included in the tonnages. Tonnages needed for communist forces were modest for the low-intensity protracted war style.