In this paper, the leaching from two individual particles and two tailings, are characterized. The target products are calcium and magnesium ions in the highest possible concentration. The experiments have shown that hydrochloric acid results in a higher leached amount of calcium and magnesium due to the higher solubility of chlorides. Sulphuric acid, on the other hand, has a reaction partner through the combination with anhydrite, in which sulphate is formed as an anion by both reactants, which is why this cannot react. Compared to hydrochloric acid, citric acid as an organic acid only produces a third of the ion concentration of calcium with the same amount used. For higher mass concentrations with the same stoichiometric ratio also means a higher leached quantity of alkaline ions. In the case of anhydrite, this is limited by the chemical equilibrium, which is validated measuring the pH value. A lower pH value therefore means a higher calcium content in the solution and correspondingly a higher final quantity of dissolved ions.