Expanding on the comment ...

Expanding on the comment from Michael Martin below, the "drying bed" technology is also called subaerial tailings deposition or managed tailings deposition.  It involves the rotational deposition of a thin lift (100mm to 150mm) of slurried (thickened) tailings (50% solids by weight) around a non-hydro-cycloned array of spigots feeding energy-robbing  drop bars.  Installations typically have a long beach and a very small supernatant pond. This technology is about 40 years old but the paste folks won't tell you about it.  No filter presses, no centrifuges, no polymers, just Stokes Law.    This proven technology isn't for every situation, but it's been used successfully from topical Fiji to Alaska and for a while, about 70% of the tailings produced in Nevada were deposited this way.  Google "subaerial tailings deposition" to learn more.