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2022-02-09_PERMIT FILE - M2021046 (2)
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2022-02-09_PERMIT FILE - M2021046 (2)
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Last modified
2/9/2022 4:05:07 PM
Creation date
2/9/2022 2:49:34 PM
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Template:
DRMS Permit Index
Permit No
M2021046
IBM Index Class Name
Permit File
Doc Date
2/9/2022
Doc Name Note
Appendix N JESIK Surface Water Management
Doc Name
Adequacy Review Response
From
Zephyr Gold USA Ltd
To
DRMS
Email Name
TC1
MAC
Media Type
D
Archive
No
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Basin A—South Offsite Stormwater <br /> Basin A is divided into 2 subbasins due to topography to account for water running to the <br /> site from the south. These subbasins extend up to Dawson Mountain south of the project. <br /> Basin A encompasses 67.69 acres and slopes are relatively steep slopes of 1:1 (h:v). <br /> Vegetation is primary shrubland with juniper and pinon pine trees. <br /> Water from the "A" subbasins will be intercepted by Channel A: Offsite Stormwater <br /> Diversion Channel and discharged into the natural drainage between the operations and <br /> stockpile areas. Twenty-four hour combined flows calculated for Basin A are 44.19 cfs and <br /> 122.58 cfs for the 10-year and 100-year storm events, respectively. <br /> There will be no development in Basin A, therefore no change in runoff quantities from <br /> the project. <br /> Basin B— Operations Area <br /> Basin B is bounded by Channel A: Offsite Stormwater Diversion Channel to the south, the <br /> tailings facility to the north, Channel B: Contact Water Pond Channel to the east and the <br /> contact water pond to the north. Basin B is 8.38 acres in area with shrubs, pinyon, and <br /> juniper trees. Channel A discharges into the natural drainage near the southeast corner of <br /> Basin B. <br /> The plant/adit pad and maintenance area pad will be built in this basin in addition to roads <br /> connecting the facilities to the primary access road. <br /> Surface water in Basin B will flow down to either the contact water pond or Channel B. <br /> Channel B discharges into the contact water pond. The contact water pond is a lined pond <br /> to collect seepage from the tailings facility and water that may contact the ore processing <br /> plant and maintenance facilities for the mine. Water in the contact water pond will be used <br /> to operate the processing plant and tested. Water will be water quality standards if <br /> discharge is necessary. <br /> Runoff will be captured and contained in the contact water pond. No outlet structures are <br /> proposed for the contact water pond. If pond discharge is required, a pump and pipe system <br /> will be used to discharge water into the natural drainage after water meets water quality <br /> standards for the project. <br /> Historical and post-development runoff flows for this basin are presented in Tables 2 and <br /> 3 above. <br /> Basin C— Laydown and Stockpile Areas <br /> Basin C encompasses the laydown, topsoil, and overburden stockpile areas. It is located <br /> between Channel C, The primary access road to the project from Temple Canyon Road, a <br /> detention-sedimentation pond, and natural drainage. o <br /> N <br /> The laydown area has stepped gravel pads with a 1 to 2 percent slope where equipment and CO <br /> materials will be stored. Topsoil and overburden stockpiles will be sloped at 3:1 (h:v). <br />
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