2022-03-08_INSPECTION - M2012032

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abRA) SrctERA41ACS Synthetic Precipitation Leachate Procedure(SPLP). The laboratory reports were submitted to the Division in mid-December. DRMS requested that OSMI provide an analysis of the results against regulatory standards, which is presented below. - ABA is the balance between the acid-producing and acid-consumption properties of a mine-waste material. The aim of ABA analysis is to produce an Acid Production Potential (AP) value and a Neutralization Potential (NP)value. With these values a Net Neutralization Potential (NNP)can be calculated: NPP=NP-AP. If the NNP is greater than 20 t CaCO3/Kt, it is generally accepted that the material is non-acid producing. The calculated NNP for the tailings made in the Revenue Mill is 70.6 t CaCO3/Kt, well above what is considered non-acid generating - SPLP is a leachate procedure that passes pH 5.00 water through the sample material and the resulting leachate is analyzed for a variety of parameters. Generally, SPLP is specific to soil and is performed to determine the potential of contaminants present in soil to leach into groundwater. The results of the SPLP performed on the tailings generated in the Revenue Mill are summarized in Table I below. All parameters analyzed for SPLP were below the applicable groundwater standards as approved in Amendment Ol of OSMI's permit. Revenue Tailings ANALYTE GW Standard (mg/L) (mg/L) Aluminum 5 0.232 Antimony Report 0.00778 Arsenic 0.1 0.00840 Barium Report 0.0809 Beryllium 0.1 <0.00008 Boron 0.75 <0.03 Cadmium 0.001 <0.00005 Calcium Report 12.2 Chromium 0.1 <0.0005 Copper 0.009 <0.0008 Iron 1 <0.06 Lead 0.044 0.00397 Magnesium Report 0.86 Manganese 1.672 0.0870 Mercury 0.01 <0.0002 Molybdenum Report 0.0123 Nickel 0.05 <0.0004 Potassium Report 6.51 Selenium 0.005 <0.0001 Silica Report 3.4 Silver 0.0001 <0.0001 2111