2024-10-31_PERMIT FILE - M2024046

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LET.STABILItA7oN• 0 4 � O ROCK SOLID SOLUTIONS DESIGN•BUILD Memorandum October 25, 2024 Leigh D. Simmons Colorado Division of Reclamation, Mining, and Safety 1313 Sherman Street, Room 215 Denver, CO 80203 Dear Mr. Simmons, This letter is to support the applicant's response to the Notice of Incomplete regarding Compromise Mine, File No. M-2024-046 dated September 10, 2024 with regards to the following item number 4, Geotechnical,Stability Exhibit: 4. Since the proposed mining plan includes blasting, Rule 6.3.3(1)(o)requires that the application include a(ieotechnical Stability Exhibit which demonstrates, in accore nce with Rule 6.5(4), that off-site areas will not he adversely affected by blasting during mining or reclamation operations. Please provide a revised version of the Geotechnical Stability Exhibit, %ith a demonstration "through appropriate blasting.vibration.geotechnical.and structural engineering analyses. that off-site areas %%ill not be adversely affected by blasting". These analyses should be certified by a professional engineer. We have reviewed the proposed M-2024-046 mining permit application and the underground mining plan. The calculations of vibration predictions for the proposed blasting, means, and methods provided in the revised Geotechnical Stability Exhibit(attached), indicate that the applicant is within OSM Safe Blasting criteria. The analyses indicate that no surface vibrations or seismic activity will exceed OSM Safe Blasting Criteria and as such, no areas or structures on or off-site should be adversely affected by the proposed blasting operations. Please call/email if any questions. o� wnnuunii Respectfully, �o�`st,pp RE "i"o, ��.•' 0J.tw.�.ya' a • 4 •O Donald J. Berger, PE .•.• Rock Solid Solutions ''s6/0N ,t�NC� (970) 987-2743