2. Global phosphate production, reserves and resource development 2.1 Global phosphate production Virtually all phosphate consumed today is derived from geological formations with a high phosphorus concentration. To qualify as a phosphate ore, these formations must contain a minimum concentration of phosphorus that makes its mining economically feasible. Historically, this concentration ranges from 25 to 35 wt% of P2O5, but the actual exploitation of the ore depends on factors such as ease of mining, extractability of the phosphate component and location of the ore deposit. The commercial product of these phosphate mines is called phosphate rock. 11 2.1.1 Classiï¬cation and composition of phosphate ore According to their genetic origin, phosphate deposits can be classiï¬ed in the following three types: sedimentary, magmatic and guano-type deposits. Sedimentary and magmatic deposits are widely distributed throughout the world, guano-type deposits occur mainly in the Paciï¬c region. Sedimentary phosphates Sedimentary phosphate deposits are formed as part of marine sedimentary sequences, mainly from the Eocene and Cretaceous ages, by precipitation of the phosphate minerals from cold phosphorus- Pagina 20
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