Abstract: Heavy media, which are heavier than the bulk density of nodules of raw deepsea mineral resources, are used to discharge the nodules on a marine ship through a lifting pipe from a sea floor U-tube connecting with a downstream pipe laid to the deepsea bottom, by operating a piston pump on the marine ship. The heavy media are fed through the downstream pipe, and when nodules mined at the deepsea floor, mainly manganese nodules and cobalt-rich crusts which contain useful heavy metal, are fed into the sea floor U-tube through feeding devices, the nodules are continuously lifted with the heavy media through the lifting pipe from the sea floor to the marine ship, by buoyant force yielding from the heavy medium. This method requires much smaller power consumption than any conventional method of lifting nodules.