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would consider approval of a plan to finish mining in the former I I I c area and <br /> surface removal of the "spill area" material as this time. <br /> b. GLA Response 3: Surface fractures in the proposed drill and blast surface quarry <br /> are discussed and evaluated in the attached Geotechnical report generated by <br /> GLA titled "Geotechnical Analysis of the Colorado Rose Red Granite Quarry" <br /> dated November 2018. See page 5 for discussion on failure potential in the <br /> surface mining area as well as safety factors for mining in the same area of the <br /> Rose Red Quarry. <br /> Adequacy Review No. 2—Items identified in the DRMS letter dated January 29,2018. <br /> Rule 6.5—Geotechnical Stability Exhibit <br /> 1. 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 /> surfaces throughout the entire Rose Red Quarry. Simply put, drilled and blasted <br /> rock will have minimal movement during blasting and a lack of fail-able material <br /> and void space beneath the blast zone precludes dynamic loading from occurring <br /> onsite. However, slope stability analysis for the surface quarry operation is <br /> discussed on page 5 of the report "Geotechnical Analysis of the Colorado Rose <br /> Red Granite Quarry" dated November 2018. <br /> 3. Within the Report, only the results of the stability analysis have been provided. Please <br /> submit the model associated with each joint orientation analyzed in the Report. <br /> a. DRMS Response 3: For any future analysis, the Division will need to evaluate <br /> the model used. <br /> c. GLA Response 3: See the associated appendices provided in report <br /> "Geotechnical Analysis of the Colorado Rose Red Granite Quarry" dated <br /> November 2018 for reference material and methods used in stability analysis. <br /> 4 <br />