A single-deck bulk carrier having two longitudinal bulkheads and a deep double bottom throughout the cargo region and intended for carriage of ore cargoes in the center holds only. The cargo hold capacity has commonly been based on stowage factor of 19.5 to 21.5cbf/ts at summer draught. These specially designed dedicated vessels spend much of their voyage time in ballast since they do not carry any cargo on the back haul.