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<br />far-removed air pollution from industrial centers <br />further west cannot be documented. <br /> <br />9. Human Activities in and Adjacent to the Monument <br /> <br />The relative isolation of Black Canyon, the marginal <br />agricultural quality of land around the monument, and <br />the s tab Ie, though depres sed economy in the region, <br />have limited impacts on resources and visitor <br />enjoyment. The scenic viewshed is large and <br />development within the view of the monument on either <br />rim would impair scenic values. Public Law 98-357 of <br />July 13, 1984, provides for protection of the North Rim <br />viewshed, but land acquisition has proceeded very <br />slowly. There is no comparable protection for the <br />South Rim viewshed. To date, the maj or use of land <br />around the monument has been livestock grazing. <br />Problems with livestock encroachment on monument lands <br />have been encountered on both rims. <br /> <br />Limited public access into the monument has accounted <br />for the minimal impact on monument resources. At <br />highly-accessible overlooks, campgrounds and picnic <br />areas, the unauthorized collection of plants and the <br />feeding of wildlife are minor problems. The <br />possibility of wildfires started by humans in this <br />fuel-rich vegetation complex requires strict control of <br />open fires. <br /> <br />Occasional vandalism <br />and at night when <br />curtailed and no one <br />randomness of such <br />difficult. <br /> <br />occurs, usually in the off-season <br />patrol capability is severely <br />is present at the monument. The <br />occurrences makes enforcement <br /> <br />A Superintendent's Compendium of park <br />completed in 1985 to protect the <br />recognized hazardous human uses, and to <br />safety in a perilous environment. <br /> <br />regulations was <br />resource from <br />improve visitor <br /> <br />Rock climbing is an increasingly popular use of the <br />monument and must be carefully controlled to prevent <br />resource damage and human inj ury. Additionally, <br />backcountry use mus t be controlled and moni tored for <br />the same reasons. Two fatalities in the last two years <br />resulted from unregistered, backcountry users who were <br />unprepared to deal with the hazards of the environment. <br /> <br />10. Other Specialized Human Uses <br />There are no outstanding mineral rights on Federal <br /> <br />12 <br />