2023-04-19_PERMIT FILE - C1981010A ‎(38)‎

• Permit No: C1981010A
• IBM Index Class Name: Permit File
• Doc Date: 4/19/2023
• Section_Exhibit Name: 1.0 Introduction
• Media Type: D
• Archive: Yes

Map M10B illustrates topsoil removal and replacement activities for each year of the permit
term, including the worst-case year of 2023. This map is the basis for pit disturbance areas.
The industrial complex area, and other topsoil replacement areas were calculated from mine
workings maps.

A topsoil replacement area for roadways was calculated for roadways lengths as shown on
Map M9 and roadway disturbance widths.

For each of the topsoil replacement areas, a typical spread point location was established
from which average haul distances and grades were determined based upon their locations

and the permanent stockpile locations. Table A-10 summarizes the results of each haul
route. TALPAC software was used to calculate production rates. The total amount of
topsoil required to replace all disturbance during worst case bond year 2023 is 3,671,312
cubic yards. Output from TALPAC is included in Appendix A.

Map M6, Bond Worst Case Year, 2023, shows the disturbed area, topsoil pile locations, the
location of final cuts, and regrade cross-section locations.

1.4.3 Facilities Removal

The estimate for the cost of facilities removal is presented in Table A-12 of Appendix A.
This estimate was generated by applying unit costs for demolition work, as referenced in
bond calculations generated by DRMS. The major demolition costs are associated with the
buildings. These estimates are broken out to reflect structure demolition, concrete removal
both for flatwork and footings, and material disposal.

The costs for miscellaneous items were generated by applying unit costs supplied by DRMS’
RN8 bond calculation.

The operation of the industrial waste pond is described in Section 4.3.2.2 and is not
expected to require more than a minimal effort at the time of reclamation.

1.4.4 Revegetation

All Areas where topsoil had been placed back over disturbed ground would require the
establishment of permanent vegetation in order to prevent erosion and make the land
productive as either cropland or rangeland (refer to Section 3.6). Table A-11 summarizes
the calculation of a total revegetation cost for each post-mining land use by areas as based
upon total estimated costs per acre and the number of affected acres.

The costs per acre are detailed in the PR11 bond calculation according to equipment
production costs, material costs, and estimated operating rates for each land use. The
equipment costs were based on equipment types selected by DRMS, which are similar to
the equipment presently being utilized at Trapper Mine for reclamation work.

1.4.5 Miscellaneous Costs

Various miscellaneous costs are addressed in Appendix A. A summary of these costs is
shown in Table A-13.

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