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Aug 26, 2019 The term phosphate rock (or phosphorite) is used to denote any rock with the high phosphorus content. The largest and least expensive source of phosphorus is obtained by mining and concentrating phosphate rock from the numerous phosphate deposits of the world. Some phosphate rock is used to make calcium phosphate nutritional supplements for ... Mar 19, 2020 Crushing consistency problems in phosphate. Since the mid-1960s a mine in Vernal, Utah, USA, has produced phosphate for agriculture fertiliser. The three ingredients used in the production of this fertiliser are ammonia, sulphur and phosphate ore. In 2003 agribusiness and food group giant JR Simplot purchased the property and formed Simplot ...