Laserfiche WebLink
During 2017, GROUND Engineering completed an analysis of four short core holes drilled near <br /> the proposed open pit quarry(Ground Engineering, Inc., 2017). As a part of this analysis, they <br /> determined specific gravity and unconfined compressive strength (UCS)of various core samples. <br /> In addition,they observed and recorded percent recovery and Rock Quantity Designations <br /> (RQD) for the core. The unconfined compressive strength measurements were 19,580 and <br /> 12,020 pounds per square inch. From the RQD observations, a Rock Mass Rating(RMR) <br /> characterization was determined to be 92, a very high rating. The high RMR indicated that the <br /> rock mass cohesion is more than 400 Kilo Pascals and that the friction angle is greater than 45 <br /> degrees. The specific gravity was determined to have an average value of 2.608. <br /> Joint and Slope Stability—Surface <br /> The Rose Red Quarry is proposing to recommence and expand drill and blast mining along the <br /> south facing slope of the property. Open pit drill and blasting will be a continuance of a <br /> previously issued DRMS I I I c permit awarded at the bequest of Larimer County to assist in <br /> construction as the result of the 2013 flood. To satisfy permitting requirements, a pit slope <br /> stability analysis for the future open pit quarry operations is provided. The findings presented in <br /> this report are based on the information provided in a document by GROUND Engineering <br /> (2017) and on insights gained during the September 6th, 2018 site visit. <br /> Rose Red Quarry Geotechnical Report 5 Greg Lewirii and Associates PLIX" <br />