The air-lift pump and the electrolytic gas-lift pump are potentially usable to collect valuable mineral resources from the deep seabed. The former is considered useless for collection of mineral resources from depths of over 3000 meters due to the power limit of compressors, whereas the latter can be used at any depth. However, design criteria for an electrolytic gas-lift pump have not been established. As a first step, this paper examines the solid lifting velocity of a single coarse particle by an electrolytic gas-lift Pump.