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Review of Blasting Operations at Denver Brick Company's Golden Mine <br /> 1.0 Introduction <br /> The Denver Brick Company currently maintains a clay mining operation on land adjacent to Pine <br /> Ridge Road, located on the west end of the property, located approximately 0.14 miles west of <br /> the general proposed blast area. The mine operation is located 0.41 miles west of Colorado <br /> Highway 93.This mine (Golden Mine) near Golden, Colorado is operated under terms of a <br /> minerals lease with the State of Colorado-owner of the mineral rights. Historically, various <br /> minerals have been mined at this site location over many years along the East Dakota Hogback <br /> which has the Golden Fault running near it. <br /> The overlying Dakota Sandstone is sedimentary rock formed millions of years ago when layers <br /> of deposited marine sand and sediment were transformed and hardened into rock. Since the <br /> sandstone covers the clay deposit, it must be removed before the clay can be excavated. In <br /> most cases, blasting is required to facilitate the excavation of sandstone during the mining <br /> process.After observing the condition of the sandstone at the Golden Mine Site, Stanto Group <br /> Inc agrees that removal of the Dakota Sandstone would indeed be impractical without the use of <br /> blasting. <br /> Like many other mining operations and quarry sites where blasting might occur, neighbors and <br /> others have expressed concern about the potential effects of blasting. In response to these <br /> concerns, Denver Brick Company retained Stanto Group Inc to evaluate the impacts that <br /> blasting at the Golden Mine might have on nearby homes and environment in general. Stanto <br /> Group Inc is an independent company, specializing in blasting and engineering services. <br /> In September 2021, Neal Stanton of Stanto Group Inc, the report's senior author, visited the <br /> Golden Mine and studied the nature of the site and surrounding property. During the site <br /> pre-blast audit survey, the physical conditions of the mine were studied and information <br /> regarding site geology, topography, facilities, neighboring property and known concerns about <br /> blasting aspects of the project were collected. The site map of the area showing various <br /> structures and facilities of concerns and the locations with respect to the proposed blasting area <br /> is shown in Figure 1.1 on the following page. <br /> In this report, the various analyses that Stanto Group Inc has used to determine the relative <br /> impacts of blasting are presented along with Stanto Group's findings and recommendations <br /> regarding specific controls and safety procedures for the proposed blasting work. <br /> 4 <br />