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2016-12-22_PERMIT FILE - M2016083
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2016-12-22_PERMIT FILE - M2016083
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Entry Properties
Last modified
12/12/2020 11:58:51 AM
Creation date
12/27/2016 9:17:32 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2016083
IBM Index Class Name
PERMIT FILE
Doc Date
12/22/2016
Doc Name
Application
From
CRG Mining
To
DRMS
Email Name
DMC
GRM
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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Exhibit C—Mining Plan(Rule 6.3.3) <br /> The plan mainly consists of continuing to extend the limited underground workings of the <br /> 400 Level, and enlarging the waste dump. For underground safety(better ventilation and <br /> secondary escapeway)the operator wants to reopen the 300 Level adit, which has been <br /> collapsed for many years. Further underground development will generate waste rock, <br /> which will be placed on the waste rock dump. Rock from the 400 Level will be used to <br /> enlarge the upper working pad, and rock from the 300 Level will be placed lower in the <br /> dry gulch. Both of the portals will be constructed to be durable and able to be secured, <br /> since they will remain on the site as permanent features,per the landowner's wishes (see <br /> letter). The portals will be safeguarded during all mining and reclamation stages. <br /> Before any portal or pad earthwork occurs all soil will be stripped and stockpiled on the <br /> upgradient end of the gulch(below the access road switchback),to protect it until it is <br /> replaced for reclamation. The stockpiled soil will be seeded to grass (see Exhibit D seed <br /> mix) and monitored for weeds. <br /> The 400 Level portal presently exists since it was constructed during the current NOI. <br /> The hill slope excavation above and around the steel sets of the adit was backfilled and <br /> contoured for stability and for reclamation. <br /> Similar to the 400 Level, constructing the 300 Level adit will require excavating back <br /> into the hill slope to competent rock,where placement of steel sets or a modified sea <br /> container will be installed. Concrete wing walls will be built on either side of the portal <br /> entry for safety and longterm stability of the cut face on the slope. The excavated hillside <br /> material will be backfilled above and around the emplaced steel adit structure, and graded <br /> to match the natural slope. <br /> The waste rock is known to be a mica schist that is non-mineralized. The wall rock of the <br /> nearby Dunraven tunnel and that already exposed in the Upper Gold Links 400 Level <br /> both exhibit this type of rock. It is anticipated that rock generated in future activity will <br /> be consistent with this, and not require any special disposal or placement. <br /> The proposed permit area is located in a dry gulch,which has never been observed to <br /> flow. However,to accommodate any natural drainage flow a CMP will be installed as an <br /> underdrain along the invert of the gulch prior to placement of the waste rock. The <br /> specifications of the CMP are: corrosion-resistant ADS material,24-inch diameter, and <br /> capacity is 12.5 CFS. Outside corrugations and wall thickness ensure strength below <br /> equipment and work areas; smooth inside walls ensure sufficient conveyance of <br /> stormwater. The ADS is installed in sections that join securely, and can be added to if <br /> needed. Approximately 400 lineal feet is estimated to be needed. <br /> New tunnel to be driven at both levels will have the dimensions of 8-ft height by 7-ft <br /> width. The estimated length and dimensions of the tunnel allow for close estimation of <br /> the volume of waste rock and size of the dump. <br />
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