In developing the thesis entitled "Technical Study Water Treatment in the Mining Industry drains" before the treatment itself, knowing the chemical composition of a mineral, we calculated the potential maximum acidity potential. neutralization and net neutralization potential, whose relations allow us to predict whether the mineral explode or produce no acidic water in order to take the appropriate steps and use preventive methods (liabilities), rather than corrective (assets). In the active treatment of mine water it is important to know the chemical analysis of mine water, in order to make the strategy of the case, as the uses that will give the treated water. In this specific case, initially the pH rises to 2.5 to 4 using calcium hydroxide, which allows the iron precipitate. At this stage the iron is removed as iron hydroxide by filtration. Subsequently raising the pH remains between ...