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w/w: percent by weight: grams per 100 g of solution
The homogeneous mixtures formed by the mixing of a solid, liquid, or gaseous substance (solute) with a liquid (the solvent), from which the dissolved substances can be recovered by physical processes. ... (12 Dec 1998) ... 
Various water solutions in the leaching circuit, from fresh make-up water, to pregnant solution containing significant amounts of precious metals and leaching reagents (chemicals), to barren solution which contains small quantities of valuable metals but mainly the leaching reagents.