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Colorado Rose Red Quarry - Surface Quarry Bench Design <br /> �70"last'drill hole orientation <br /> \ �` �30'highwall per bench <br /> potential 75'fracture <br /> �So <br /> 00 <br /> s <br /> s/ ` <br /> o� <br /> 'catch bench <br /> Not to scale \ <br /> View to the east <br /> Figure 1. Schematic cross-section of the surface quarry operation at the Colorado Rose Red <br /> Quarry. <br /> Adequacy Review No. 2—Items identified in the DRMS letter dated January 29,2018. <br /> Rule 6.5—Geotechnical Stability Exhibit <br /> l. As part of the additional information provided with the GE's Report, it appears that <br /> Colorado Rose Red Granite Quarry is applying to blast within the quarry. It also appears <br /> that GE's slope stability evaluation does not consider dynamic loading the Report. Please <br /> have GE reevaluate slope stability to include dynamic loading in which it may experience <br /> in the event of blasting. <br /> a. DRMS Response 3: Similar to the items above,the Division will not <br /> conditionally approved the amendment application as proposed. The <br /> engineering/stability analysis will need to consider dynamic loading. Please either <br /> provide the required evaluation or revise the proposed mining plan to exclude the <br /> surface quarry and blasting. <br /> b. GLA Response 3: Dynamic loading and failure thereof is the result of heavy <br /> weight applied to a surface that results in that surface's failure. Drilling and <br /> blasting, in this case, will not result in measureable or concerning dynamic <br /> loading as the rock mass to be liberated via drill and blast will remain in situ post <br /> blasting and will rest on intact granite bedrock—the exclusive bedrock and <br /> 6 <br />