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2023-03-01_REVISION - C1981010
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2023-03-01_REVISION - C1981010
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Last modified
3/1/2023 1:28:12 PM
Creation date
3/1/2023 1:17:45 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
Revision
Doc Date
3/1/2023
Doc Name
Adequacy Review #2
From
DRMS
To
Trapper Mining, Inc.
Type & Sequence
PR11
Email Name
RAR
JLE
Media Type
D
Archive
No
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22. Given possible instability in these area please speak to the stability of the locations <br /> for holding large stockpiles, especially with regards to any previously mined areas <br /> that the overburden may be placed on. <br /> Trapper Response to Comments 22: Trapper contracted with Agapito Associates,Inc. of Denver, Colorado <br /> to evaluate the stability of the temporary overburden stockpile designs mentioned above. Agapito concluded <br /> that the designs resulted in stable configurations with the 15 Pits stockpile showing cross section safety factors <br /> all exceeding 1.7,while the C Pit cross sections all met or exceeded safety factors of 1.3. <br /> DRMS 28 February 2023 <br /> DRMS notes that Trapper Mine Inc.provided the AGAPITO Geotechnical Report for the N <br /> Pit spoil piles for 1R124, no such analysis was included in the PRII submission for the C <br /> Pit spoil piles. <br /> Please as per Rule 2.05.3(6)(b) and 2.05.3(6)(c)provide the Agapito analysis <br /> indicating the safety factors referenced in the response above. <br /> 23. Approximately how long will the stockpiles occupy their temporary locations? <br /> Trapper Response to Comments 23: The stockpiles will remain in place until near the end of the Trapper mine <br /> life,anticipated to be in 2028. <br /> Trappers' response adequately addresses the above cited rule with the exception of the provision to <br /> DRMS of the Agapito analysis for C Pit which is still outstanding. <br /> Rule 2.05.6(2)Mitigation of Impacts Fish and Wildlife <br /> DRMS 28 February 2023 <br /> 24. Please provide an official species list from: <br /> https://ecos.fws.gov/ipac/ <br /> Trappers' response adequately addressed the above cited rule with a detailed species list from the <br /> website. <br /> Rule: 2.05.6(3) Protection of Hydrologic Balance <br /> DRMS 28 February 2023 <br /> Permit Section 4.8.3 discusses hydrologic impacts. DRMS notes that mining has occurred <br /> previously in the expansion area proposed in PR11 and that no undisturbed drainage exists <br /> within the permit boundary. <br /> This rule is adequately addressed; however, as ongoing analysis at DRMS is underway,future <br /> adequacy questions concerning groundwater impacts may be forthcoming. DRMS completed the <br /> groundwater review and associated adequacy take up at question number 39. <br /> Rule 2.05.6(4)Mitigation of Impacts,Public Parks and Historic Places <br /> DRMS February 2023 <br /> 25. Please address the concerns related to the 7 November 2022 letter from History <br /> Colorado as it relates to listed archeological sites and provide information as to Trapper <br /> Mine Inc's.plan to protect any sites listed or eligible for listing as determined by SHPO. <br /> Trapper Response to Comment 25: See comment number 3.Mitigation of archeological sites will be handled per <br /> section 4.1.1 of the permit Concerning sites located in I West-Pit if they are to be disturbed,a mitigation plan has <br /> been developed with Metcalf Archeological Consultants and will be implemented if needed. <br /> 10 <br /> Trapper Mine PR I ADQ No 2 <br /> 2023 February <br />
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