Laserfiche WebLink
M-1977-410 <br />Technical Revision 10 <br />April 26, 2022 <br />10 <br /> <br /> <br /> <br />Filtration study (May 2021) <br />The Cross and Caribou Mines effluent waters were sampled, and laboratory tested to identify optimal <br />micro filtration (0.1 µm, 0.45 µm, and 5 µm) to determine if non-compliance of potentially dissolved <br />metals was driven by particulate/sediment solids present in the waters. <br />The study concluded that removal of particulate materials from the Caribou Mine effluent (Idaho Tunnel), <br />is effective in achieving permitted water discharge standards without additional treatment. The Study <br />indicates that Cross Mine dewatering effluent does not meet effluent standards for dissolved Zinc and <br />Cadmium; therefore, additional treatment is required.