2019-11-22_REVISION - C1981019 (2)

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RULE 4 PERFORMANCE STANDARDS (pre-2000) revegetation will prove to be very difficult and expensive with little or no chance for success given the present competition from established grass species and big game grazing pressures. Therefore, it is recommended that Colowyo continue discussions with the state agencies to alter,through technical revision,target land uses and bond release standards applicable to at least pre-2000 revegetation areas." In 2000, Colowyo Mine, along with the Seneca II and Trapper Mines, participated in a shrub establishment program identified as the "CSU/DMG Shrub Establishment Field Trials." This program is described below: CSU/DMG Shrub Establishment Field Trials Introduction and General Study Description Shrub establishment demonstration plots have been established at the Colowyo Mine, Seneca II Mine and Trapper Mine. The goal of the plots is to evaluate cost effective methods for establishing native shrubs on reclaimed lands. Native shrub establishment on reclaimed lands has been a challenge. Competition from herbaceous species and wildlife browsing present significant obstacles to establishment. Introduced cool season grass species in particular were frequently seeded in the recent past, and stands dominated by these aggressive grasses have suppressed establishment and growth of the slow growing native shrub species. The uniform replacement of topsoil, at depths ranging from 12-20 inches, may be another factor contributing to the homogenous grass community structure. Grasses thrive at the expense of forb and shrub species. The young shrub plants that do get established are highly desirable browse for deer and elk. Thus, heavy browse pressure creates another limitation for shrub establishment. In an effort to overcome these limitations,the Division of Minerals and Geology(DMG)requested Colorado State University (CSU) to assist with a study plan to evaluate shrub establishment. A study design was developed after considerable discussion with representatives from the mining community, the DMG and the Colorado Division of Wildlife (DOW). Three coal mines in northwestern Colorado volunteered to assist with the project by providing personnel, regraded lands for the plots, construction equipment, planting materials, elk proof fencing, and plot maintenance. At each mine demonstration plots were constructed in the fall of 2000. Five to six treatments were established to evaluate shrub establishment techniques that have commercial practicality on a large scale. The specifics of the Colowyo demonstration plots are found in the Colowyo Mine Specific Field Trial section of this narrative. The study design took into consideration the possible limitations to shrub establishment. The treatments vary at each mine to accommodate the reclamation techniques and material availability for each site, but certain similar treatments were included at each mine. To evaluate effect of the herbaceous competition, seed mixes were designed so that shrubs contributed the majority of the seed mix. Two seed mixes were evaluated at each mine: • a native grass, forb and shrub seed mixture an Rule 4 Performance Standards 4-51 Revision Date: 11/18/19 Revision No.: MR-211