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Serpentine ore from the Eastern Desert of Egypt was leached with aqueous hydrochloric acid. Experimental statistical design program (ESD) was applied to study the influence of different variables on leaching efficiency (reaction temperature, leaching time and Hydrochloric acid (HCl) to Magnesium oxide (MgO) molar ratio (stoichiometry) where the liquid/solid ratio of 5:1 ml/g was maintained constant along the experiments. The mathematical model and the different contours (curves generated from ESD) were discussed. The results showed that, all the studied parameters are effective. The results have been collected at a 3-D cube showed that at high levels of parameters (4 hrs, 95 degrees C and 1.6 S), the Magnesium oxide recovery was about 96.5%, while Magnesium oxide recovery was 67.1% at the low levels (2 hrs, 65 degrees C and 1.4 Stoichiometry (S).