2013-10-02_PERMIT FILE - C1981019A ‎(3)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 10/2/2013
• Section_Exhibit Name: Rule 2 Permits -ST
• Media Type: D
• Archive: Yes

RULE 2 PERMITS
2.05.4 (2)(b) Reclamation Costs
The estimate of the cost of reclamation of the operations required to be covered by the
performance bond is found under Rule 3.
2.05.4 (2)(c) Backfilling Plan
As the mining progresses westward, as shown on Map 23A, overburden material from each
successive cut will be backfilled into the previously mined out area and the additional spoil will
continue to buildup in previously mined areas, thus creating a large in -pit temporary spoil pile.
This cycle will be repeated for the entire mining area. Due to shape, size and depth of the South
Taylor pit, results in leaving the majority of the spoil backfilling process until final pit closure.
As a result, Colowyo has officially requested a variance for a delay in contemporaneous
reclamation based on Rule 4.14.1(1)(d) which states that "Rough backfilling and grading shall be
completed within 180 days following coal removal and shall not be more than four spoil ridges
behind the pit being worked.. ". The mining techniques utilizing dragline and truck/shovel
operation are shown in detail on Mining Range Diagram (Map 24A), and show the approximate
distance between topsoil removal and replacement. Premining topography is presented on Map
18A and the postmining topography is shown on Map 19B. Map 20B provides cross - sections of
the premining and postmining topography. Map 28B presents the topsoil handling movements
and the timing of stripping activities. Map 29A shows the spoil grading sequence timing of
reclamation activities.
The backfilled mining areas will be graded to establish a stable post mine topography that blends
into the undisturbed areas outside the mining limits (Map 1913). Colowyo will grade all final
slopes so that overall grades do not exceed 33% (Map 2013). Additional information on the
backfilling and regrading plan are discussed further in Volume 1, Section 2.05.4 and Section
4.14.
2.05.4 (2)(d) Topsoil Salvage
Prior to any mining- related disturbances, all available topsoil will be removed from the site to be
disturbed as discussed in Section 2.05.3, and will be redistributed or stockpiled as necessary to
satisfy the needs of the reclamation timetable.
Final grading before topsoil placement will be conducted in a manner that minimizes erosion and
provides a surface for the topsoil that minimizes slippage. If spoil compaction is a problem, the
spoil will be ripped with a dozer to minimize compaction, assure stability and minimize slippage
after topsoil replacement. The average uniform topsoil replacement depth will be 19.8 inches as
determined by the topsoil salvage calculations shown on Tables 2.04.9 -6, 2.04.9 -6A, and 2.04.9-
7. Topsoil may be applied at depths that are lesser or greater than the specified depth in selected
areas where plants, that may require a shallow or deep soil, will be established in conjunction
with the proposed post- mining land use. Areas that require a variable topsoil depth replacement
plan will be addressed through a Technical Revision to the permit after approval of PR -02.
Topsoil will normally be reapplied by hauling, in trucks, from topsoil stockpiles or from areas
where topsoil has been removed for mining advance, to the regraded spoil areas and then
redistributed with dozers. Alternate methods may also include placing topsoil on slopes with a
dragline followed by redistribution with dozer, or using a scraper to redistribute the topsoil.
When necessary to ensure replacement to the required depths, replacement depths will be staked
on the regraded spoil.
South Taylor /Lower Wilson — Rule 2, Page 104 Revision Date: 12/14/10
Revision No.: TR -81