Stackable tailings, I think, are the dream for the mining side of the industry. It would mean you could immediately put tailings back into the mine and start reclaiming right away.
One of the unique characteristics of these mines is that because of the tailings, they have a very long delay between opening the mine and being able to begin reclamation. The consolidated tailings release a lot of water, and this requires a basin. With stackable tailings, you could immediately put solid material back into the mine site.