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High Country Conservation Advocates v. United States Forest.... 951 F.3d 1217 (2020) <br />2100 fewer acres—nearly 30% less land. This 2100 -acre <br />difference represents more than 10% of the entire North Fork <br />Coal Mining Area. <br />The difference in accessible tons of coal is even greater. <br />Alternative C would allow access to 95 million short tons <br />of coal, whereas the Pilot Knob Alternative would allow <br />access to 128 million short tons of coal. This represents 33 <br />million short tons, which is approximately 35% more coal <br />than Alternative C and 19% of the total amount of coal <br />recoverable in the entire North Fork Coal Mining Area. <br />Further, the Pilot Knob Alternative is significantly <br />distinguishable from Alternative C because it would affect <br />entirely separate coal resources. The record indicates that <br />if the North Fork Exception were reimplemented, mining <br />would be less likely to occur in the areas protected under <br />the Pilot Knob Alternative than in the areas protected under <br />Alternative C. The Pilot Knob Alternative would foreclose <br />mining on land adjacent to the idle Elk Creek Mine, which <br />has not produced any coal since December 2013. The mine <br />does not appear likely to resume production, as its operator <br />has auctioned off mining equipment and demolished mining <br />infrastructure within the mine. In contrast, Alternative C <br />would foreclose mining in the Flatirons and Sunset Roadless <br />Areas adjacent to an active coal mine—the West Elk Mine. <br />The operator of the West Elk Mine, moreover, has applied for <br />lease modifications that would extend the mine into areas that <br />would be protected under Alternative C. In short, the Pilot <br />Knob Alternative would foreclose mining only if production <br />at the Elk Creek Mine resumed, whereas Alternative C would <br />foreclose expansion of coal leases already sought by the <br />operator of the West Elk Mine. <br />Moreover, the two alternatives would result in significantly <br />different environmental impacts because the Pilot Knob <br />Roadless Area is geographically separate from, and has <br />habitat features dissimilar to, the Sunset and Flatirons <br />Roadless Areas. We have recognized, albeit in a different <br />context, that "location, not merely total surface disturbance, <br />affects" environmental impacts and that "the location of <br />development greatly influences the likelihood and extent of <br />habitat preservation." Richardson, 565 F.3d at 706, 707. Of <br />the three roadless areas, only the Pilot Knob Roadless Area <br />contains a winter range for deer and bald eagles, a severe <br />winter range for elk, and a historic and potential future habitat <br />for the Gunnison sage -grouse. See Balt. Gas, 462 U.S. at 97, <br />103 S.Ct. 2246 (NEPA requires agencies to "consider every <br />significant aspect of the environmental impact of a proposed <br />action"). <br />*1227 In sum, we conclude that the Pilot Knob Alternative <br />and Alternative C are significantly distinguishable because <br />they differ in acreage of protected land, amounts of <br />recoverable coal, likelihood of coal mining activity, and <br />environmental impacts. We recognize that agencies must <br />engage in line -drawing and are due deference in that exercise. <br />See %omine, 661 F.3d at 1250. "By necessity, an agency <br />must select a certain number of [alternatives] for serious <br />study and eliminate the rest without detailed analysis," Prairie <br />Band Pottawatomie Nation v. Fed. Highway Admin., 684 <br />F.3d 1002, 1012 (10th Cir. 2012). Nevertheless, NEPA and <br />the APA require agencies to act reasonably in eliminating <br />alternatives from detailed study. In this case, the Forest <br />Service failed to provide a logically coherent explanation <br />for its decision to eliminate the Pilot Knob Alternative. That <br />alternative was not "remote, speculative, or impractical or <br />ineffective" as judged against the Forest Service's statutory <br />mandate and the project goals. Richardson, 565 F.3d at 708 <br />(quotation omitted). And it was "significantly distinguishable <br />from the alternatives already considered." Id. at 708-09. We <br />thus conclude that the Forest Service's elimination of the <br />Pilot Knob Alternative from detailed study in the North Fork <br />SFEIS was arbitrary and capricious. <br />B <br />Plaintiffs also challenge the elimination from detailed <br />study of the Methane Flaring Alternative in the agencies' <br />promulgation of the Leasing SFEIS. The Leasing SFEIS's <br />stated purpose was to "facilitate recovery of federal coal <br />resources in an environmentally sound manner." It provided <br />two bases for the agencies' decision to eliminate the Methane <br />Flaring Alternative from detailed study. <br />First, the Forest Service and BLM included a section on <br />their elimination from detailed study of alternatives requiring <br />Mountain Coal to use methane -mitigation measures. They <br />noted that assessing any potential methane -mitigation <br />measure requires "site-specific exploration data" and <br />"resultant engineering designs," which would be part of <br />the mine -permitting process conducted by state agencies, <br />OSM, and the federal Mine Safety and Health Administration <br />("MSHA"). And the agencies found that the effectiveness <br />of portable methane flares in the lease modification area is <br />uncertain because the effectiveness of a flare depends on a <br />is i•'f <br />