The history of San Diego Sugar Mill dates back to 1887, when businessmen Otto Bleuler and Sophus Koch purchased the San Diego farm and started the production of handmade loaf sugar, and from 1901, centrifuged sugar.
From 1958, the San Diego administration goes to Fraterno Vila Betoret, who has tirelessly promoted the growth of the organization. One of his first challenges was to build a new, bigger and modern Sugar Mill. This goal was achieved in 1965.
That year, the new mill began operations with an 800 tons daily cane milling to produce 1,500 quintals of sugar per day. In the 1965-66 cane harvest 70,936 quintals of sugar were produced, and a year later in the season 1966-67, 126,871 quintals of sugar were produced.