鉱滓[kousai] slag
残滓[zanshi] remains
油滓[aburakasu] oil cake (fertilizer made of oily vegetable dregs)
味噌っ滓[misokkasu] miso lees
燃え滓[moekasu] cinders

食べ滓[tabekasu] leavings of a meal
搾り滓[shiborikasu] strained lees (e.g. sake, tofu)
熔滓[youshi] slag
搾め滓[shimekasu] oil cake

黄鉄鉱[outekkou] iron pyrites
金鉱地[kinkouchi] gold field
原鉱[genkou] (raw) ore
鉱化[kouka] mineralize
鉱業[kougyou] mining industry

鉱山[kouzan] mine (ore)
鉱山技師[kouzangishi] mining engineer
鉱山業[kouzangyou] mining industry
鉱質[koushitsu] mineral
鉱床[koushou] ore deposit