Laserfiche WebLink
Wild Horse Reservoir Project West Test Quarry DRMS 111 Application <br /> unweathered rock (expected to comprise some of the extraction extent), rock will be loosened and/or fractured <br /> by blasting. <br /> The excavation areas are the areas of the site considered in the resource estimate and subject to quarrying and <br /> extraction;the excavation area will be bounded by a "limit of excavation" perimeter line. Design parameters (such <br /> as wall height and slope angle) for excavation cuttings in soil and rock will be verified via slope stability analyses <br /> after investigation coring is performed. Excavations in soil and rock will be performed to comply with specified <br /> maximum slope angles.The depth of each quarry is designed to avoid excavations below the groundwater table. <br /> Test quarry excavation will be cut into the face of the existing topography with a free-draining floor. Where <br /> required, blasting will be carried out to loosen the material prior to excavation. Blasting and excavation will be <br /> carried out successively to an allowable extent and depth into the existing topography, to be confirmed during <br /> further test quarry development. Excavated material will be hauled outside the excavation limit to the proposed <br /> layout and crushing area,where the material will be processed and stockpiled. Stripped loose excavated material <br /> may also be used to form a level platform in the downslope direction of the quarry if necessary. <br /> Erosion control measures(e.g.,erosion control logs)or berms will be placed around the footprint of the test quarry <br /> sections to divert drainage around the outside of the test quarry section boundaries.Water runoff, if encountered, <br /> is expected to originate from rainfall and/or ordinary construction activities and will be controlled via the use of <br /> other similar temporary works in order to prevent erosion and/or excess pore pressure within the open cuts. <br /> Test quarry geometry will be adjusted based on final stability calculations. In the steepest scenario. the angle of <br /> each wall face will not exceed 63.5 degrees from the horizontal (0.5H:1 V). Slope stability calculations modeled this <br /> geometry as the steepest-case scenario. It is likely that the Operator will opt for shallower slopes and reduced wall <br /> heights during operations. Benches may be cut into the open cast excavation sides based on continuous field <br /> monitoring of joint networks and kinematically-admissable blocks. The width of each bench will be varied as <br /> required to meet the working method. Each bench length would slope downwards(along the length of the bench) <br /> at an approximate 5% grade. For additional details, reference the Geotechnical Stability Exhibit (Appendix A). <br /> 3.2.6 Disturbance Dimensions and Road Dimensions <br /> 6.3.3(f) specify the dimensions of any significant disturbances to the land surface such as pit excavations, mine <br /> benches, impoundments, stockpiles, waste rock disposal areas, etc. <br /> 6.3.3(g) specify the dimensions of any existing or proposed roads that will be used for the mining operation. <br /> Describe any improvements necessary on existing roads and the specifications to be used in the construction of <br /> new roads. New or improved roads must be included as part of the affected lands and permitted acreage. <br /> Affected land shall not include off-site roads which existed prior to the date on which notice was given or permit <br /> application was made to the office and which were constructed for purposes unrelated to the proposed mining <br /> operation and which will not be substantially upgraded to support the mining operation. Describe any <br /> associated drainage and runoff conveyance structures to include sufficient information to evaluate structure <br /> sizing. <br /> The dimensions of the investigation items are listed in Table 3-1 and described in further detail below. <br /> TETRA TECH May 2024 11 <br />