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2019-10-01_REVISION - M2012050 (13)
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2019-10-01_REVISION - M2012050 (13)
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Last modified
1/18/2025 4:28:59 AM
Creation date
10/2/2019 12:17:51 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M2012050
IBM Index Class Name
REVISION
Doc Date
10/1/2019
Doc Name
Adequacy Review Response
From
River City Consultants
To
DRMS
Type & Sequence
AM1
Email Name
ACY
Media Type
D
Archive
No
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M-2012-050 <br /> September 9, 2019 <br /> Page 12 <br /> (b) where such an agreement cannot be reached,the applicant shall provide an appropriate <br /> engineering evaluation that demonstrates that such structure shall not be damaged by <br /> activities occurring at the mining operation; or. <br /> A new evaluation needs to be conducted for the proposed expansion area. Note there is a difference <br /> in FOS for critical vs. non-critical structures. Please explicitly state each structure being evaluated, <br /> the distances from the affected lands, and the distances in which disturbances can safely occur <br /> while maintaining the appropriate FOS.Also reference Rule 6.5 and the MLRB FOS policy for <br /> guidance. <br /> Previous Engineering evaluation is dependent upon an'experimentation' to confirm site conditions <br /> however no commitments to conduct such `experiments' are mentioned in the mining plan. Please <br /> address this by either adding a commitment in the mining plan or a revised engineering evaluation <br /> that applies to the whole mine site. <br /> Response: Exhibit U-2 observed existing loaded highwalls and confirms slope stability of existing <br /> highwalls. Future observations will occur on area AM-1. <br /> (c) where such structure is a utility,the Applicant may supply a notarized letter,on utility <br /> letterhead,from the owner(s) of the utility that the mining and reclamation activities,as <br /> proposed,will have "no negative effect" on their utility. <br /> 6.5 GEOTECHNICAL STABILITY EXHIBIT To support Rule 6.4.19 <br /> (1) On a site-specific basis,an Applicant shall be required to provide a geotechnical evaluation <br /> of all geologic hazards that have the potential to affect any proposed impoundment,slope, <br /> embankment,highwall,or waste pile within the affected area.The Applicant may also be <br /> required to provide a geotechnical evaluation of all geologic hazards,within or in the <br /> vicinity of the affected lands that may be de-stabilized or exacerbated by mining or <br /> reclamation activities. <br /> (2) On a site-specific basis,an Applicant shall be required to provide engineering stability <br /> analyses for proposed final reclaimed slopes,highwalls,waste piles and embankments.An <br /> Applicant may also be required to provide engineering stability analyses for certain slopes <br /> configuration as they will occur during operations,including,but not limited to <br /> embankments.Information for slope stability analyses may include,but would not be <br /> limited to,slope angles and configurations,compaction and density,physical <br /> characteristics of earthen materials,pore pressure information,slope height,post- <br /> placement use of site,and information on structures or facilities that could be adversely <br /> affected by slope failure. <br /> (3) Where there is the potential for off-site impacts due to failure of any geologic structure or <br /> constructed earthen facility,which may be caused by mining or reclamation activities,the <br /> Applicant shall demonstrate through appropriate geotechnical and stability analyses that <br /> off-site areas will be protected with appropriate factors of safety incorporated into the <br /> analysis.The minimum acceptable safety factors will be subject to approval by the Office, <br /> on a case-by-case basis, depending upon the degree of certainty of soil or rock strength <br /> determinations utilized in the stability analysis, depending upon the consequences <br /> Page 8 of 10 <br />
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