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Battle Mountain Resources,Inc. <br /> San Luis Project <br /> P.O. Box 310 <br /> San Luis, Colorado 81152-0310 RECEIVED <br /> 719 379-0798 <br /> AeR 1120?3 <br /> April 7,2023 CW4-5Q 11 GF R " <br /> "HNGACIa®,ScRl W <br /> Mr. Lucas J. West <br /> State of Colorado <br /> Colorado Department of Reclamation, Mining, & Safety <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> Re: Battle Mountain Resources,Inc. <br /> San Luis Project-M-88-112 <br /> March 2023 Monthly Report <br /> Dear Mr. West: <br /> The following summarizes monitoring and site activities at the Battle Mountain Resources Inc. (BMRI) <br /> "San Luis Project" (M-88-112) for the month of March 2023. Surface and groundwater monitoring and <br /> analysis were completed for all the required sites during the month as specified in the TR-32 Quality <br /> Assurance and Quality Control(QA/QC)Plan. <br /> Tailing Facility/Leak Detection System <br /> The six lysimeters which are a part of the Lined Tailing Facility(LTF)leak detection system were inspected <br /> and verified for proper vacuum and operation. As shown in Table 1,there was no pore space water found <br /> to be present in any of the six lysimeter collection pans, therefore, no sampling or laboratory analysis was <br /> required. <br /> Table 1 —Monthly Lysimeter Monitoring <br /> L simeter Identification Observation Date Depth to Water feet <br /> LS1R2 03/30/2023 DRY <br /> LS2R2 03/30/2023 DRY <br /> LS3R 03/30/2023 DRY <br /> LDIR2 03/30/2023 DRY <br /> LD2R2 03/30/2023 DRY <br /> LD3R 03/30/2023 DRY <br /> The ten piezometers located on the tailing impoundment main embankment were inspected and measured <br /> for depth to water. The depths to water found for each piezometer are shown in Table 2. All piezometers <br /> were either dry or contained less than twelve inches of water. <br />