To characterize the leaching rate with HCl, tests are performed on all particles at 0 min (no acid addition), 30 min, 1 h, 3 h, 5 h, 8 h, and 24 h. The acid concentrations for all particles are based on the stoichiometric ratio for anhydrite and are St = 0, 0.2, 0.5, and 1. For anhydrite and talc, mass concentrations of 10% and 15% are also considered. Anhydrite is the calcium component of the copper mine. Therefore, in contrast to the other particles, additional tests are performed on anhydrite using the different acids HCl, H2SO4 and citric acid. The leached samples are filtered through the above mentioned filter medium from Sefar GmbH (manufacturer name 07-1500-SK 011, Edling, Germany) with a filter area of 0.00196 m² using a pressurized filter cell according to VDI Guideline 2762-2 and the solution is filtered again through a syringe filter with 0.45 µm pore size . Direct filtration with a membrane is not possible due to the high solids concentration of more than 5 % w/w. Afterwards the now particle-free solution is analyzed on an ion chromatograph from Metrohm AG (Herisau, Switzerland) using the Metrosep C 6 -150/4.0 separation column. At the same time, the conductivity of the suspension is measured using the WTW Cond 340i conductivity meter (Weilheim, Germany). The conductivity can be used to estimate the kinetics of the solubility of particles in deionized water. This is not possible using the ion chromatograph, as the manual process via the syringe filter is not feasible in terms of time.