Phosphate Ore deposits of Esfordy area are located 26 Kilometers N.E. of the city of Bafgh, near Yazd, and adjacent to it, is the Iron ore body of the same name. The Esfordy area as well as the above two deposits are consisting of rocks which are more or less metamorphosed, have endured severe faulting, and are thus crushed in most places. The age of these rocks is related to infra — Cambrian time.
The igneous rocks of the region mostly include Alkaline Rhyolitic rocks which are accompanied by Rhyolitic tuffs, Lamprophyre and Diabasic Dikes. These rocks do not have a direct bearing on formation of phosphates in the region.
The sedimentary rocks found in the region are Limestone, Brown Dolomite, Shaly Sandstone and Gypsum. It can be stated that the over all variations in rock types of the region are very extensive.
The phosphate deposit under investigation, like most other igneous phosphate deposits of the world, is containing a high grade of P205. In addition to phosphorus, the rare earth elements such as La, Ce, Nd and Li, Nb are also present in appreciable quantities and possess an important economic value. The said deposit is a result of metasomatism replacement and in course of its formation a Magma with carbonotitic character had played an important role.
* This Paper is presented in detail in Persian language in this Issue.