Laserfiche WebLink
Colorado Rose Red, Inc. Page 6 <br /> Colorado Rose Red Granite Quarry M-1978-332 <br /> rainfall or during snow melt observations are made of the face at the beginning of each working <br /> day and if it appears there is a potential for a rock fall the area below the loose rock is blocked off <br /> until it can be safely removed. This usually involves scaling the loose rock where needed. <br /> 18. Given the potential for small localized failures it would seem there is a potential for <br /> rockfall to occur that may cause off-site impact. Please either demonstrate the existing <br /> mine benches outside and below the current highwall are adequate to catch the potential <br /> rockfall from failures in this area or provide a plan to construct adequate catchments for <br /> the rockfall. <br /> This has never been a problem. The land below the existing mine face shows no recent(last 40 <br /> years) signs of localized failures. Even in the old spill area where historically waste stone was <br /> pushed over it never made it past he immediate vicinity of the mine.. In the new permit area the <br /> lowest level is a wide flat area that was graded during mining for the 111 permit project . It is <br /> actually a shallow bowl that would capture any rocks that get thru the trees and catch any small <br /> failures from leaving the mine site. This is true even if the rocks could get past the trees on that <br /> slope. The existing top bench is an average of 65 feet wide and the second bench is <br /> approximately 18 feet wide and slopes into the hill that have been used to safely catch rocks that <br /> might come off the old mine face. The mine lies in a basin like area where rocks from above <br /> would tend to funnel into the new permit limits and not leave the site. <br /> 19. According to page 65 of the application the interior roofs of the `rooms' were not included <br /> in the stability evaluation performed for this study. Please provide a geotechnical <br /> evaluation of geologic hazards associated with the existing and proposed underground <br /> roofs and `rooms'. Based on this evaluation, where there is the potential for failure of any <br /> geologic structure caused or exacerbated by the existing and proposed underground mining <br /> operation please demonstrate that off-site areas will be protected with appropriate factors <br /> of safety incorporated into the analysis. <br /> The cost to obtain this type of analysis is beyond the means of Colorado Rose Red at this time. It <br /> is the Divisions speculation that there will be a failure so having to prove there won't is ridicules. <br /> Colorado Rose Red is willing to take the risk and understands that if a failure occurs that affects <br /> areas outside the permit area they will be the responsible party. Also the land surrounding the <br /> permit area were potential rock fall could end upis owned by Colorado Rose Red and ranges from <br /> 500 feet on the east and over a 1000 on the south most of which is cover by large trees, so only <br /> their property would be impacted. <br /> 20. Regarding the proposed quarry operations (separate from the underground dimensional <br /> stone operation), the stability analysis conducted by Ground Engineering and submitted <br /> should not be used to draw conclusions regarding the stability of the proposed future mine <br /> benches and highwalls. As indicated on page 67 of the report,the evaluation may not <br /> contain sufficient information for other purposes. Given this, please provide engineering <br /> stability analysis for the proposed final reclaimed slopes/highwalls. Based on this <br /> evaluation, where there is the potential for failure of any geologic structure, demonstrate <br /> that off-site areas will be protected with appropriate factors of safety incorporated into the <br /> analysis. <br /> COLORADO ROSE RED ADEQUACY RESPONSE 01- June 8,2018(9.54am) <br />