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2021-05-27_PERMIT FILE - C1981019A (7)
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2021-05-27_PERMIT FILE - C1981019A (7)
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Last modified
5/18/2022 8:31:44 PM
Creation date
10/20/2021 6:44:11 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
5/27/2021
Doc Name
Addendum Collom and South Taylor Highwall Mining Geotechnical Design
Section_Exhibit Name
Volume 20 Exhibit 27 Item 7
Media Type
D
Archive
Yes
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Agapito Associates, Inc. www.agapito.com <br /> ENGINEERS & GEOLOGISTS <br /> NPENEW <br /> April 23, 2021 227-43 <br /> Mr. Lee Sampson, P.E. <br /> Senior Mining Engineer <br /> Colowyo Coal Company <br /> 5731 Highway 13 <br /> Meeker, CO 81641-9124 <br /> Re: Additional Highwall Mining Areas, Collom Box Cut and South Taylor Pit, Colowyo <br /> Coal Mine, Meeker, Colorado <br /> Dear Lee: <br /> As you requested on behalf of Colowyo Coal Company(Colowyo),Agapito Associates,Inc.(AAI) <br /> has reviewed additional target areas for potential highwall mining (HWM) near the Collom box <br /> cut (Collom) and from the South Taylor Pit (South Taylor). AAI previously studied HWM areas <br /> for Collom and South Taylor and developed detailed reports for each.',2 The additional targets <br /> relative to the previously studied areas are shown in Figure 1. <br /> AAI's previous South Taylor study' included mining of the G7 Seam, and where the G7 and G8 <br /> Seams come together, their combined thickness (referred to as the G78 Seam). This mining was <br /> planned from the low wall (southeast portion) and endwalls (southwest and northeast portions) of <br /> the pit. Colowyo is currently considering an additional area not specifically addressed in our <br /> previous report, in the northwest and southwest portions of the pit, where only the G7 Seam will <br /> be targeted. The original study area and the expanded area for South Taylor are shown in Figure 1. <br /> AAI's previous Collom study2 included mining of several seams from the low wall and endwalls <br /> of the Collom Box Cut. Most of the targets are seam splits that occur close to one another, with <br /> little or no parting thickness. For example, the B2/B3 Seam consists of the combined B2 and B3 <br /> splits. Mining from the low wall generally included HWM panels mined downdip to the north. <br /> This previously studied HWM area in Collom is also shown in Figure 1. Colowyo is currently <br /> considering two additional areas not specifically addressed in our previous report. The area in <br /> Figure 1 labeled "North Target Area" may be mined updip to the south, and targets the B1/B2, <br /> C3/C5, D1/D2, and E2 Seams. The area labeled "South Target Area" may be mined generally <br /> along strike from either side of the drainage and targets the D 1/D2 and E2 Seams. <br /> ' Agapito Associates,Inc. (2014),"Geotechnical Design and Operational Considerations for Highwall Mining, South <br /> Taylor Pit G78 and E/D2 Seams, and West Pit F, E, D2, and C Seams," report to Colowyo Coal Company, <br /> April 21, 78 pp. <br /> 2 Agapito Associates, Inc (2019a), "Geotechnical Design and Operational Considerations for Highwall Mining, <br /> Collom Box Cut,"report to Colowyo Coal Company,November 20, 143 pp. <br /> DISCLAIMER:This report contains professional opinions based on information provided by the Owner. AAI makes <br /> no warranties, either expressed or implied, as to the accuracy or completeness of the information herein. Opinions <br /> are based on subjective interpretations ofgeologic data;other equally valid interpretations may exist. Identification <br /> and control of hazardous conditions are the responsibilities of the Owner. <br /> 1536 Cole Blvd.,Suite 310, Bldg. 4 715 Horizon Drive, Suite 340 <br /> Lakewood, CO 80401 Grand Junction, CO 81506 USA <br /> +1 303.271.3750 +1970.242.4220 <br />
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