From an old Krn report
? KRN’s solution mine plan forms a “pregnant” brine solution consisting of magnesium, potassium and sodium soluble salts that are subsequently processed in a surface plant to evaporate/crystallize the potash (sylvite) from the brine.
• InKRN’smineplan,waterfromtheoverlayingBlairmoreaquifer,heatedtoawarmer temperature (possibly 60 degrees Celsius) than the deposit (25-30 degrees Celsius), is injected through boreholes drilled to the bottom of the target horizon, and the resulting brine is pumped from the caverns to the surface.