The great salt flats are made up of a perfectly horizontal thick salt layer which covers 1500km2 of terrain. The salt workers extract the salt which basically contains sodium chloride, mixed with small quantities of sulphate and calcium chloride. The task consists in obtaining ground salt to be commercialized in all the country and also to make rectangular salt "blocks" to sell and barter with the domestic cattle farmers. Salt is extracted through three different methods. Digging pools, raking the surface or cutting salt blocks or bricks. The pools are dug up to the level of underground water and the brine is left to crystallize due to over saturation. Thus highly pure sodium chloride is obtained. To obtain blocks the crust is cut off with sharp axes, since it is as hard as granite.
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