A sump for an underground mine is adapted to combine the output from a plurality of slurry lines, concentrate the product and separate the water for recycling. A pump room provides a lift pump for removing the slurry at a high concentration and also provides a pump for recirculating the water from the sump. The sump essentially comprises a first sloping trench and second and third sloping trenches which slope into the first trench. The slurry pump is connected to the lowest point in the first trench. A partition is built between the second and third trenches and the shallowest end of the first trench and a weir is placed between the partitioned portion and the rest of the sump so that excess water can flow from the sump into the partitioned portion of the sump. The water recirculation system is connected to the shallowest end of the first sump.