2025-06-27_PERMIT FILE - C1981022

• Permit No: C1981022
• IBM Index Class Name: Permit File
• Doc Date: 6/27/2025
• Doc Name: Revegetation Plan
• Section_Exhibit Name: Exhibit 2.05-E6 Revegetation Plan
• Media Type: D
• Archive: No

MR-117 H-24 Revised June 2025

Species Composition

The species composition revegetation success standard was derived from quantitative
sampling of the approved reference area, and represents the significant species contributing
to the composition of the reference area, based on seasonality, lifeform, and origin.

Species composition and a demonstration of the adequacy of the seasonal nature and
support of the post-mining land use of the reclaimed area vegetation will be successful when
there are three or more perennial or biennial plant species of which two are graminoids and
one is a perennial or biennial forb or shrub. No one component of the above three species
should comprise greater than 60% relative cover nor less than 2% relative cover, during a
given year’s quantitative sampling.

Species composition data will be derived from quantitative relative vegetation cover
information collected by species or quantitative herbaceous production data collected by
species. Plant species listed as noxious by the Colorado Department of Agriculture (species
on CDA Noxious Weed List A or B) may not be considered in the evaluation of species
composition success.

2.8.8 REVEGETATION SUCCESS CRITERIA: POST-SMCRA, INDUSTRIAL OR
COMMERCIAL RECLAIMED AREAS (CATEGORY H)

A number of areas at the mine were disturbed post-SMCRA, have an approved post-mining
land use of industrial/commercial, and have been developed for that post-mining land use.
The activities on these areas are not conducive to revegetation for their use (i.e., Elk Creek
and Sanborn Creek facilities, sediment pond B, and similar areas). These areas will not have
a revegetation standard for final revegetation success, as they have been requested to be left
post-mine by the surface landowners, and any erosion from these areas is minimized and
controlled by in-place best management practices.

2.9 REVEGETATION SAMPLING METHODS AND STATISTICAL DEMON-
STRATIONS FOR REVEGETATION SUCCESS (RULES 2.05.4.2(E), 4.15.11)

2.9.1 METHOD FOR SAMPLING PRE-SMCRA, UNDEVELOPED LAND RECLAIMED
AREAS (CATEGORY A)

In pre-SMCRA reclaimed areas that have an undeveloped land post-mining land use,
revegetation sampling to determine reclamation success will be necessary only where
determined by the surface landowner and where necessary for surface erosion control.
These areas are identified in Table TR-A.

The applicable revegetation success standard for such areas will be a technical standard for
total vegetation cover adequate to control erosion as specified in Section 2.8.1.

Quantitative sampling will employ the applicable methods for sampling design, timing,
sample numbers/sample adequacy, and statistical analysis as described in Methods for
Sampling Post-SMCRA, Undeveloped Land Reclaimed Areas Using a Reference Area.