2004 年 15 巻 p. 5-20
In mining basin and in some deposits, several types of ores are often formed under different physico-chemical conditions. Each of these types can contain polluting chemical elements in byproduct, which need to be removed. We note also that commercial value of a sedimentary phosphate ore depends on the presence of impurities such as carbonates, silicates, iron and organic matter. So as to reply to technical, commercial and environmental demands, it is therefore necessary to proceed to the typology and the location of these different ores. In phosphate ore deposits of the Djebel Onk mining basin in Eastern Algeria, several mining and geological researches companies such as EREM and BRGM have defined this typology, use classic methods such as mineralogical and petrographic studies of rock samples collected from drilling cores. In this study, the typology has been confirmed ore specified in the four main phosphate deposits of the Djebel Onk basin using the monovariate discriminate method called“Passage par zero”and the potential method (dynamic clouds method) which is a multivariate statistical discrimination method. These methods were applied using chemical data (P2O5, CO2, CaO, MgO, Fe2O3, SiO2 and RI) of whole rock samples collected from drilling cores during the assessment stage. Different ore types have been obtained for each of the four main deposits.
