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M-1977-410 <br />Technical Revision 10 <br />April 26, 2022 <br />21 <br /> <br /> <br /> <br /> <br />Pond #1 Overtopping Management <br />As referenced in the caption for Figure 1, The primary purpose of the pipeline extension is to preclude <br />potential overtopping of Pond #1 via a pipeline conveying flows that would exceed the capacity of Pond <br />#1 into an existing Juliet ventilation raise. The Juliet Raise vertically intercepts the 2nd, 3rd, and 4th levels of <br />the Cross Mine. <br />The Juliet Raise is already serving as a water passageway to the lower levels of the Cross mine water from <br />the Apache/Potosi working area. A secondary benefit of the application would be an increase of solids <br />settling time contained in Caribou water. <br />The currently installed system comprises a 194 ft long 6” pipe conveying Pond #3C Caribou effluent into <br />Pond #1 behind the Cross Shop. The proposed extension would incorporate a 6” HDPE T-fitting at the end <br />of the existing pipe, where automated float valves would shutoff discharges into Pond #1 and divert the <br />flow into the Joliet Raise. The extension requires approximately 80 ft of 6” HDPE pipe. <br />GIR submitted to DRMS on April 14, 2022, a request for approval from DRMS pursuant with Mined Land <br />Reclamation Board Cease and Desist Order, for the installation of the pipeline which would extend the <br />pipeline that currently conveys water from Pond #3C to Pond #1 into the Cross Mine underground <br />workings known as the Juliet Raise. DRMS granted authorization on April 14, 2022 and requested that <br />details of the installation were presented in this Technical Revision. A schematic figure of the piping <br />change is shown below (Figure 3). <br /> <br />Figure 3 – Schematic Pipeline from Caribou Mins/Idaho Tunnel to Pond #1 and Cross Mine Juliet Raise