The Rossing uranium mine in Namibia recycles acid water to the grinding mills because of a water shortage; Ranger recycles to reduce the amount of make up water that would be required from groundwater resources and to minimize the amount 'lost' through evaporation from ponds. Olympic Dam in Australia cannot recycle acid water to the grinding circuit because of process considerations, but can return this water to the leaching circuit; after grinding, the pulp is thickened to a high density, and then diluted with acid water before leaching.