noun
Mining and tunneling term for earth, rock, or debris removed during excavation.
トンネル工事で出たずりは、別の場所に運ばれた。
The muck from the tunnel construction was transported to another location.
鉱山のずり捨て場が山の斜面にある。
The mine's waste rock dump is on the mountain slope.
残土 is a broader term for surplus soil from construction, while ずり specifically refers to excavated material from mines or tunnels.
The origin is uncertain; possibly related to the verb ずる (to slide or shift), referring to material that is moved or removed.