REV01840

• Permit No: C1981010
• IBM Index Class Name: Revision
• Doc Date: 12/23/1996
• Doc Name: TRAPPER MINE MIDTERM PERMIT REVIEW PN C-81-010
• From: TRAPPER MINING INC
• To: DMG
• Type & Sequence: MT3
• Media Type: D
• Archive: No

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TRAPPER ~I1~t1~G tNC.
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999
Mr. Joseph J. Dudash
Environmental Protection Specialist
Colorado Division of Mnterals & Geology
1313 Sherman Street, Room 215
Denver, CO 80203
Dear Joe:
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July 25, 1996 DG,('
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JUL 29 1998
D;v;sion of IvfinE~rais 3 Geology
Re: Trapper Mining 1nc.,.Perurit No. C-81-OJU, Midternt Review
Revised Surplus Topsail Plan:
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Please accept this letter as Trapper's response to DMG's request that the propose a specific plan for the
existing topsoil surplus at Trapper Mine. Enclosed are several items relating to this plan that should be
updated in the permit document, including: !}revised Tables 4.9-3 and 4.9-4 which show the updated top-
soil balance after accounting far orphan topsoil piles, 2) a revised worksheet to be placed in Appendix A
which details new bonding requirements for orphan topsoil piles, 3) a revistxi pemut page 1-41 which
reflects an updated number of orphan topsoil piles, and 4) a table {Table 1} presenting a detailed balance
between topsoil stockpiles versus mine wide disturbance areas, which should be placed with the worksheet
in Appendix A, In addition, a regrade plan for orphan topsoil pile A92-S is presented for your wnsidera-
tion. Finally, the revised bond submitted with this midternt review reflects dte changes to this orphan top-
soil stockpile plan.
We have completed an exhaustive topsoil balance evaluation and have detemtined the amount of surplus
topsoil to be approximately 433,500 BCY's. This quantity of surplus topsoil was estimated very conserva-
tively, assuming replacement of an average 14 inches of topsoil in Ashmore and Hawker pits in order to
ensure that an average 12 inches of topsail is in place after allowing for settling, possible sheet erosion, etc,
Enclosed Table I summarizes the topsail balance evaluation. Topsail stockpile quantities aze balanced
against disturbance acres to be retopsoiled. [n the Derringer/Enfield pits area there is just enough remain-
ing topsoil stockpiled to replace the required average 12-inch topsoil depth. This assumes that the yet-to-
be-disturbed acreage in Derringer pit will balance topsoil salvage and replacement. Thus, alt topsoil
stockpiles in Derringer and Enfield pits will be exhausted with no orphan piles left. Sufficient topsoil to
replace an average 12-inch depth on the mine access road, the B/C haulroad and the mine facilities area is
considered in Table 1. Again, this balance is conservative because some additional topsoil wilt be available
on cut and fill areas of the haul and access roads. The Flintlock pit topsoil balance shows a small amount
of surplus topsoil. However, because Flintlock pit topsoil was salvaged after the April, 1994 agreement
beriveen Trapper and DMG regarding topsoil handling (April I8, 1994 letter from Kent Gorham to Forest
Luke), Trapper is committed to replacement of all salvaged topsoil in this pit, Likewise, the Table 1 top-
soil balance evaluation assumes that with all Trapper Mine land disturbed from 1994 through the end of
mine life, topsail salvage will balance with topsoil replacement. (Nate: Table 1 does not include topsoil
balance information for sediment pond areas because it was felt that these areas are sa small and remote
that a topsoil salvage and replacement balance would simply be assumed.}