PERMFILE55324

• Permit No: M1980047
• IBM Index Class Name: Permit File
• Section_Exhibit Name: EXHIBIT D DESCRIPTION OF PROPOSED ACTION
• Media Type: D
• Archive: No

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CRUSHING AND CONVEYING
Crushing operations will be conducted 24 hours a day, 365 days a
year, barring unscheduled interruptions and scheduled turnarounds.
The crushing operation will reduce run-of-mine shale in two stages
to a retort feed size of minus one-half inch. All crushing and
conveying equipment will be driven electrically and consume about
150 million kwh annually. Primary crushing will be done at the
mine portal bench as illustrated in Figure D-5. Figure D-6 is
a schematic diagram of the primary crusher and incline conveyor.
Final crushing will be performed on the plateau near the retorting
and upgrading facility. A covered conveyor system will be used
to transport crushed shale between crusher, storage areas, and
the retort. These facilities are illustrated in Figures D-7
and D-8.
• The crushing operation is designed to maintain a continuous feed
to the retort. This objective will be accomplished in part by
maintaining a storage pile of coarse ore and a storage bin of
fine ore. A storage facility for run-of-mine ore may not be
needed. The mine haulage operation is closely dependent on the
operation of the primary crusher. Should a breakdown occur in
the primary crusher or the conveyor to the coarse ore storage,
haulage from the mine will be interrupted. To avoid shutdown
of the retorting and upgrading facilities, sufficient storage
of coarse ore will be maintained to allow uninterrupted operation
of the downstream processing facilities for about one month.
If the final crusher breaks down, the amount of stored fine ore
will be enough to operate the retort for approximately 5 hours.
The capacity of the primary crusher and the conveyor to the coarse
ore stockpile will be 4,500 tons per hour. Figures D-6 and D-9
illustrate the coarse ore conveyor and stacker. The final crusher
and coarse ore storage site will be located on the plateau approx-
imately 900 feet in elevation above the mine portal bench. A
portion of the ascent from the mine bench to the plateau will
D-22