Description: The Agua Santa Nitrate Plant located in the Northern Canton of Tarapacá and owned by Mrs. Francisca Hidalgo viuda de Osorio, started to process nitrate with the "Paradas" system in the decade of 1850.
In 1874 it became the property of the company Campbell Outram & Co. that reformed it to the Machine stage. Subsequently, as a result of the innovations made in Oficina San Antonio de Zapiga by the English engineer James Thomas Humberstone, he was hired to introduce his productive facilities, the Shanks system.
Towards 1878 it started to process nitrate with this new system becoming the Nitrate Plant with largest production in Tarapacá.
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