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Chemical Safety Data Sheets (SDSs)for the chemicals listed above were provided in TR-14 and <br /> associated addendums to TR-14 and also are included in Appendix 8. <br /> The new Reagent Room will be equipped with a concrete apron so that reagents may be <br /> unloaded and placed in the building without leaving secondary containment. The concrete apron <br /> is 78 feet long and 9-10 feet wide. The thickness of the reinforced concrete is 6". A swale was <br /> formed in the concrete apron, which is 6" to 8" deep and leads to a sump on the east side of the <br /> building. The apron can contain roughly 1,300 gallons. A level-controlled pump of 300 gpm <br /> capacity has been installed in the sump to automatically pump liquids or slurry back to the <br /> thickener or the 18,000-gallon slurry tank. <br /> Operation of the new Reagent Room and mill is detailed in Exhibit D. <br /> 5.2 Ore, Concentrate and Waste Rock Handling <br /> Ore is concentrated in the milling process and will consist of fine ground galena, sphalerite, <br /> tetrahedrite, chalcopyrite and a minor amount of free gold. <br /> A lined pad has been constructed near the Revenue portal to allow for temporary storage of <br /> tailings awaiting testing and to allow for the import of ore material from offsite, should OSMI <br /> seek approval for this activity. <br /> Recovered concentrate from the milling process is packed in supersacks, which are stored in the <br /> mill tunnel, removed from the tunnel by forklift, loaded on highway trucks and shipped offsite <br /> for sale. More details about the Pb and Zn circuit and concentrate handling may be found in <br /> Exhibit D. <br /> Waste rock is inert and not expected to generate toxic or acid forming materials. A majority of <br /> waste rock generated is used to backfill mined out stopes. The small quantity of waste rock that <br /> comes to the surface is tested for hazardous characteristics and used for road base on and off site, <br /> which was permitted as part of TR-10. See Appendix 7 for typical analysis of waste rock. <br /> 5.3 Preventing Adverse Off-site Impacts <br /> The following sections describe how designated chemicals are handled during operations of the <br /> mill and how the potential for acid mine drainage is managed to prevent off-site impacts. <br /> 5.3.1 Mill Reagents <br /> Adverse off-site impacts are prevented through both engineering controls and administrative <br /> controls. Engineering controls include secondary containment in the new Reagent Room, mill <br /> and crusher gallery as well as in the other areas where fuels and oils are stored. Other <br /> M-2012-032 <br /> Amendment 02 Exhibit U <br /> December 2021 U-13 <br />