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2023-07-27_GENERAL DOCUMENTS - C1981038
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2023-07-27_GENERAL DOCUMENTS - C1981038
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Last modified
8/2/2023 10:03:54 AM
Creation date
7/31/2023 10:38:22 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981038
IBM Index Class Name
General Documents
Doc Date
7/27/2023
Doc Name
Proposed Decision and Findings of Compliance
From
DRMS
To
Bowie Resources, LLC
Type & Sequence
RN8
Permit Index Doc Type
Findings
Email Name
RDZ
MAC
Media Type
D
Archive
No
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backfilling scheme. In the preliminary adequacy review of the original permit application, <br /> the Division stated that it considered their proposal to be inadequately supported within the <br /> application. Further, the Division required the applicant to complete an appropriate <br /> geotechnical and stability analysis to demonstrate that the proposed final configuration <br /> would be stable and would satisfy the requirements of Rules 4.14 and 4.27, "Operations on <br /> Steep Slopes." The results of the analyses would then be utilized by the applicant to prepare <br /> a detailed engineering design which conformed to the above regulations. <br /> The operator retained the services of Merrick and Company and Geo-Hydro Consultants, <br /> Inc. (Geo-Hydro)to investigate the slope stability of the entire surface facilities area at the <br /> Orchard Valley (Bowie No. 1)Mine. Phase I of this study was completed and a summary <br /> report,prepared by Geo-Hydro,was submitted to the Division for review on July 21, 1981 <br /> (See PAP Volume 6). The analysis,prepared in accordance with the present state-of-the-art <br /> of geotechnical analysis, determined that no immediate major hazards existed at the mine <br /> site. The report does observe, however, that some local stability problems exist and the <br /> factors of safety of individual cuts and fills will have to be increased by redesign and <br /> reconstruction to achieve a stable final reclaimed configuration, in accordance with the <br /> regulations. <br /> Geo-Hydro completed the Phase II analyses on April 15, 1982, in accordance with the <br /> stipulated requirements of the originally approved Permit (See PAP Volume 6). The <br /> stipulated tasks of the Phase II analyses included evaluation of nearby landslides mapped <br /> by the Colorado Geological Survey, completion of test drilling and test pits, installation of <br /> monitor wells, soil and rock testing, and the completion of a series of stability analyses for <br /> current slope configurations of the existing surface facility area at the Bowie No. I Mine. <br /> The operator,in conformance with recommendations made by its geotechnical consultants, <br /> installed tilt-metering devices within several of the fill benches of the surface facilities at <br /> the Bowie No. I Mine. The purpose of these devices was to collect additional geotechnical <br /> data, which was used to verify past analytical assumptions and to complete final analysis <br /> and design, originally stipulated as Phase III of the surface facility studies, within the <br /> approved original permit. <br /> Utilizing the results of Geo-Hydro's analyses, Merrick & Company completed a Phase II <br /> amended design for the drainage facilities at the existing surface facility area of the Orchard <br /> Valley (Bowie No. 1) Mine. The operator also completed a detailed stability analysis and <br /> redesign of the proposed final reclaimed configuration for the surface facilities at the mine. <br /> This design was submitted and approved in Technical Revision No. 28. The cut and fill <br /> areas were restored to their approximate original contour except for an access road which <br /> will remain following reclamation. The access road will be within a 20-foot wide terrace <br /> corridor. <br /> In August 1986, the operator submitted a permit revision application to construct a West <br /> Mine portal facility in the East Roatcap Creek valley at the Orchard Valley(Bowie No. 1) <br /> Mine. This application proposed the construction of a new portal facility and haul road, <br /> because the existing portals at the East Mine were rendered unusable by an underground <br /> 32 <br />
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