REV00332

• Permit No: C1981010
• IBM Index Class Name: Revision
• Doc Date: 6/15/1988
• Doc Name: TR 41 REVISION TO ASHMORE AND COLT PIT MINING AREAS AND UPDATE OF PERMIT RENEWAL PR 2 MAPS
• From: TRAPPER MINING INC
• To: MLRD
• Type & Sequence: TR41
• Media Type: D
• Archive: No

By increasing the mining area in Ashmore Pit, an evaluation of the
affect on the 1988-1992 permit term bond is required. Section 4.0 of
this revision discusses bonding.
2.0 Colt Pit Mining Area.
Development drilling data from 1987 more accurately defined the coal
resources in Colt pit. Therefore, a change in the mining area for the
1988-1992 permit term as presented in PR-2 is required. Map M10B, sheet
2 of 4, is attached to show the proposed mining change.
In 1988, an additional 14.7 acres will be added to the Colt pit mining
area and 6.2 acres will occur in the part of Colt pit partially mined
prior to the abandonment of the pit. Also, 1,8 acres of the area
planned for mining in 1989, will need to be done in 1988. This leaves
6.7 acres of actual new mining disturbance. As shown on Map M10B, this
area is located at the southeast corner of Colt pit. This increase in
mining area and resultant boxcut spoil will require an increase in the
topsoil removal area. Map M10A, sheet 2 of 4, topsoil removal, outlines
the increase in topsoil stripping for Colt pit. As shown, approximately
32 additional acres will need to be stripped of topsoil. Note that the
additional area to be stripped includes the previously reclaimed scoria
pit, portions of reclaimed Derringer pit, and a portion of reclaimed
Colt pit. Reclamation criteria established in recently approved PR-2
will be applied to the "re disturbed" area.
The 1987 development drill data also indicates a reduction in coal
resources available in the Colt pit area. During 1988 and 1989, 36.2
less acres will be mined than originally planned. Revised map M10B,
sheet 2 of 4, shows this reduction. In addition, M10A, sheet 2 of 4,
also shows this same reduction in terms of topsoil removal.
Much of the change occurs in federal lease C-25948. The amount of area
to be affected in this lease by Colt pit operations was reduced from 45
acres to 9.4 acres. Since less coal is actually present, the tons of
coal to be mined were reduced from approximately 149,000 tons to about
108,000 tons. Since this was a change in the mine plan, consultation
was made with local Bureau of Land Management personnel on June 10.
Attachment 1 presents the information required by the Bureau personnel.
Topsoil removal for these proposed changes is scheduled to begin August
1st, 1988. All material from these areas will be hauled to existing
topsoil stockpiles. Mining of Colt pit will begin no earlier than Aug
15, 1988. The dragline will dig in on the newly added area at the north
end of the pit. Spoil will be placed to the east, into the current open
cut of Colt pit.
By adding additional mining area at the southeast corner of Colt pit,
the resulting boxcut spoils will cause a change in the recently approved
postmining contour map. Revised map M12 is included with this revision.
Note that the new change will have little effect on the existing
established drainage. Reclamation of the additional areas will be as
presented in recently approved PR-2.