1. A PROCESS OF CONCENTRATING LANGBEINITE IN AN ORE CONTAINING LANGBEINITE, SYLVITE AND HALITE WHICH COMPRISES PREPARING A FREELY FLOWING AQUEOUS PULP OF SIZED ORE BY MIXING SIZED ORE WITH BRINE, FLOWING AQUEOUS PULP BY GRAVITY AS A SLURRY STREAM IN A SPIRAL PATH AT A RATE OF FLOW AT LEAST SUFFICIENT TO AVOID ANY SUBSTANTIAL AMOUNT OF AGGLOMERATION OF PARTICLES, COLLECTING A LANGBEINITE CONCENTRATE PORTION FROM THE SPIRALLED STREAM AS A SLURRY, AND SUBSTANTIALLY SEPARATING THE LANGEBEINITE CONCENTRATE FROM AQUEOUS SOLUTION, THE TIME INTERVAL FROM WHEN THE ORE IS MIXED WITH BRINE TO WHEN THE LANGBEINITE CONCENTRATE IS SUBSTANTIALLY SEPARATED FROM THE AQUEOUS SOLUTION BEING LESS THAN ABOUT FIVE MINUTES.