Laserfiche WebLink
San Luis TSF David Carino <br /> 2021 Annual Dam Safety Inspection Battle Mountain Resources,Inc. <br /> Table 2 San Luis TSF Underdrain Flow Measurements: June 2020 -June 2021 <br /> Date Flow (gpm <br /> 6/30/2020 36.5 <br /> 7/30/2020 32.5 <br /> 8/31/2020 30.0 <br /> 9/30/2020 29.5 <br /> 10/29/2020 29.5 <br /> 11/30/2020 30.0 <br /> 12/30/2020 29.5 <br /> 1/28/2021 29.5 <br /> 2/25/2021 29.5 <br /> 3/31/2021 30.5 <br /> 4/29/2021 31.0 <br /> 5/27/2021 31.0 <br /> 6/30/2021 32.0 <br /> 2021 INSPECTION FINDINGS <br /> The overall surficial conditions of the tailings dam at the time of the inspection were generally <br /> satisfactory, except for minor issues discussed in more detail below. <br /> Right Downstream Groin: Revegetation in this area following repairs continues to improve. <br /> This area and also the cross-berms and rock-lined down-drains should be monitored closely to <br /> make sure erosion does not progress to detrimental levels. <br /> South Diversion Ditch Drop Structure: Disturbed areas adjacent to the drop structure that are <br /> not protected by riprap were seeded in 2019. However, vegetation establishment is poor to date <br /> due to extended drought conditions, and erosional rilling is beginning to develop in these areas. <br /> The condition is presently judged to be minor; however, erosion will progress in the absence of <br /> vegetation, and mitigation will likely be required in the coming years. Mitigation may entail <br /> erosion repair, erosion control blankets, revegetation, and/or cutting in shallow swales along the <br /> slope to reduce runoff flow path lengths. <br /> Seepage Underdrain Collection System: Continue the jetting and video inspection program to <br /> ensure the drain pipes do not become clogged. Consider installing a concrete structure for <br /> collecting underdrain flows from the toe drains to facilitate maintenance in the toe drain area, <br /> improve conditions for monitoring and inspecting the drain system, and to prevent the attraction <br /> of animals to the area by pooling of leakage from the drain pipes. <br /> 3 Engineering Analytics,Inc. <br />