In 2012 the USGS estimated world reserves at 71 billion tons, whereas zero.19 billion tons have been mined globally in 2011. If it’s assumed that the phosphate minerals in phosphate rock are primarily hydroxyapatite and fluoroapatite, phosphate minerals comprise roughly 18.5% phosphorus by weight.

If phosphate rock accommodates around 20% of those minerals, the common phosphate rock has roughly 3.7% phosphorus by weight. The largest international producer and exporter of phosphates is Morocco. Within North America, the largest deposits lie within the Bone Valley Read more

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