how is it produced?
Salt is extracted from the vast sedimentary deposits  and is then mined directly or extracted and then purified by mechanical evaporation of brine. It is then refined and goes through recrystallization.
Salt
salt is extracted from the vast sedimentary deposits which have been laid down over the millennia from the evaporation of seas
where does salt come from in the world Sodium chloride and seawater
wiki:20271610
Salt [SEP] Production
The world's oceans are a virtually inexhaustible source of salt, and this abundance of supply means that reserves have not been calculated. The evaporation of seawater is the production method of choice in marine countries with high evaporation and low precipitation rates. Salt evaporation ponds are filled from the ocean and salt crystals can be harvested as the water dries up. Sometimes these ponds have vivid colours, as some species of algae and other micro-organisms thrive in conditions of high salinity. Elsewhere, salt is extracted from the vast sedimentary deposits which have been laid down over the millennia from the evaporation of seas and lakes.