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Saltpeter Mine Ruins in Mammoth Cave. The process involved burial of excrements (human or animal) in the fields prepared for that purpose beside the nitraries, watering them and waiting until the leaching process did its job; after a certain time, operators gathered the saltpeter that "came out" to the ground surface by efflorescence.
In 1913 Santa Laura halted its production until the Shanks extraction process was introduced, which enhanced productivity. However the economic model collapsed during the Great Depression of 1929 because of the development of the synthesis of ammonia by the Germans Fritz Haber and Carl Bosch , which led to the industrial production of fertilizers.
Developed for the extraction of saltpeter, it is a Chilean National Monument and part of a UNESCO World Heritage Site designated as Humberstone and Santa Laura Saltpeter Works. [ 1 ] [ 2 ] [ 3 ] History
The Act establishing the Nitre and Mining Bureau by the Confederate Congress stated: "That said bureau shall consist of one lieutenant colonel as superintendent, three majors as assistant superintendents, six captains and ten lieutenants, in which shall be included the officers of the present nitre corps, who shall have the same pay and allowances prescribed for officers of cavalry of the same ...
Saltpetre worker: A saltpetre worker produced potassium nitrate, an essential ingredient in gunpowder, by extraction from soil rich in dung and urine. [39]: 102–106 [188]: 18–25 [189] The arduous and expensive process of the saltpeter worker [190] was rendered uneconomic by cheaper imports from India. [188]: 133–135 Econom: 13: 18: Samurai
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