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PERMFILE101223
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PERMFILE101223
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Entry Properties
Last modified
8/24/2016 9:55:35 PM
Creation date
11/24/2007 7:43:09 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977378
IBM Index Class Name
Permit File
Section_Exhibit Name
EXHIBIT A LEGAL DESCRIPTION CONT
Media Type
D
Archive
No
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Once the slashers are set, the faces in the doq holes are <br />advanced to intersect the end raises to forma scram drift. <br />Pockets are driven into the footwall side of the scram on 25 foot <br />centers, raised up and belled out from hanging to footwall and <br />pocket to pocket to form the undercut. As soon as the undercut <br />is established, the raises are driven up to that level. At that <br />point, the prep phase is considered to be complete. <br />To avoid leaving pillars on the levels, some stopes are <br />prepared by driving a lateral drift parallel to the vein and then <br />driving cross-cuts back to the vein. The lateral is normally <br />driven on the footwall side and 30 feet off the vein.. The <br />location of the vein is established before the lateral is driven <br />by an exploration drift driven on the vein. Two back cuts are <br />taken out of the drift to make room for the swell from they first <br />shrink cut. <br />Two raises are started up on each end of the ore bloc:k from <br />the drift, and cross-cuts from the lateral are connected to the <br />raise bottoms for access during stoping, Crosscuts are then <br />driven on 30-foot centers from the lateral into the vein drift. <br />Waste rock from the pockets and lateral development is stacked in <br />the drift between the pocket opening. This reduces the amount of <br />waste rock that needs to be hauled from the area and hill the <br />area between pockets that cannot be reached with the LHD or <br />mucking machine. At this point, both shrink stops preparation <br />methods can proceed in similar fashion. <br />stoping commences by drilling and shooting a box cut just to <br />one side of the center raise. Subsequent rounds consist of <br />upside down bench blasting into the box cut advancirn3 along <br />strike in both directions toward the ends of the block. Rounds <br />are drilled with hand-held stopers using six-foot steel. After <br />every other cut, the raises are advanced to the nominal top of <br />the muck pile. <br />The stops is carried upward with nominal six-foot cuts off <br />of the back until the top of the oreshoot is reached or the <br />remaining drift sill pillar equals the vein width. In order to <br />maintain sufficient work room between the muck pile and the stops <br />back, approximately one third of the broken ore is drawn during <br />the stoping phase by selectively slushing the pockets on the <br />scram level. <br />Overhand Cut and Fill Stoping <br />Ore blocks are developed by driving an undercut drift (vein <br />width) along strike of the ore block. <br />Production stoping consists of filling the undercut with <br />waste rock fill and then breasting down ore on top of ttie fill. <br />LHDs work on top of the fill, and muck out the broken ore. After <br />the ore is removed, waste rock is placed in the void and another <br />breast cut is taken. Access to the area is maintained by <br />- 12 - <br />
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