Gold cyanidation - Wikipedia
It is vacuum pan salt produced by industry standard solution mining and evaporation process. The salt is washed, filtered, dried, screened, admixed, compacted into sheets, and quality control tested. Special Purity Salt (Food Grade) Special purity salt can be used in the process of manufacturing food and also in residential and commercial pools.This process relies on a small starting source of quartz, referred to as a seed crystal, upon which further quartz crystals are grown. These seed crystals are difficult to find and are primarily produced by Canada, Brazil, Germany and Madagascar.