2020-02-07_PERMIT FILE - M2020007 ‎(2)‎

• Permit No: M2020007
• IBM Index Class Name: PERMIT FILE
• Doc Date: 2/7/2020
• Doc Name: Application
• From: L.G. Everist, Inc.
• To: DRMS
• Email Name: ECS
• Email Name: MAC
• Media Type: D
• Archive: No

EXHIBIT D MINING PLAN (coNT)
it only has to be handled once . In Phases 1 and 2 , all topsoil
storage piles will be located as far from the river as practical,
and will run parallel to the river ' s flow if located in the
floodplain.
During the stripping, a slurry wall pad will be built around
the reservoir Phase mining area using the excess topsoil and
overburden. When the slurry wall pad has been completed, the
bentonite slurry wall construction will begin. This is done by
excavating a trench in the pad that is keyed into the underlying
bedrock and filled with a mix of overburden, bentonite and water to
create the slurry that becomes the liner. The overburden not used
in slurry wall construction will be placed in the disposal areas or
sold.
After the slurry wall liner is place within a phase, a
dewatering trench will be excavated. Then a pump will be installed
and dewatering will begin. This will allow the area within the
slurry wall to be dry mined. The trench will be extended around
the area as mining progresses .
The active mining area in the reservoir phase will remain dry.
After mining is completed, final reclamation of the phase can be
completed, including liner certification, final grading of slopes
and initial seeding for revegetation. At this time, the reservoir
will be turned over to the owners . They will be overseeing con-
struction to complete the reservoir operations facilities and
filling. As mentioned previously, any developed water storage
facility construction that the landowners complete falls under
Reclamation Option B and L.G. Everist will file a Technical Revi-
sion to incorporate the changes .
Dewatering as mining progresses facilitates early testing of
the slurry wall liner, which is required to receive liner approval
certification from the State Engineer' s office .
In general, mining will commence in the south end of each
Phase and work north (except for Phase 1, where mining will start
in the north and progress south) . As noted above, the Alpha suffix
stages will be mined first in each general area to provide areas
for disposal of excess overburden and processing fines generated
from the mine .
The working face will be mined near vertical to maximize
removal of material from the mine . At its widest point, the
working face will be approximately 2600 feet long. If mining ends
prematurely, this working face slope will be reclaimed using a
cut/fill sloping method instead of backfilling. As mining reaches
the vertical face setbacks limits around each reservoir, mining in
this band from the top of the slope to the vertical face limit will
change to a slope mining method to leave the 3 : 1 final slope . We
L.G. Everist, Inc. Ragsdale Reservoirs February 6,2020
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