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0%350 MINERAL RESOURCES Mineral development would not be constrained by withdrawals, and long-term loss or delay in mineral production would not occur. SOIL AND WATER RESOURCES Mineral development would potentially result in some increases in long-term erosion and sediment yields and possibly some decrease in the quality of surface waters from mine discharge and spoil pile runoff. Some loss in soil productivity would be expected in areas where surface disturbing activities, such as OHV use and road construction occur. RIPARIAN ZONES Timber harvests occurring in riparian areas would result in long-term decreases in the condition of these areas. Livestock grazing management under this alternative would result in some areas that are now in good to exceUent condition experiencing a decrease in condition and most other areas being stabilized and experiencing an improvement in condition and increased production. WILDLIFE HABITAT Colorado Division of Wildlife long-term herd goals for elk and deer would be achieved. Land treatment projects which reduce sagebrush below 25% would lower sage grouse populations. LIVESTOCK GRAZING Disposal of 7,986 acres of public land would reduce the long-term productivity by 532 AUMs. VISUAL RESOURCES Mineral development, livestock grazing and timber harvests would result in scenic quality being lowered on affected lands. IRREVERSIBLE OR IRRETRIEVABLE COMMITMENTS OF RESOURCES Irreversible or irretrievable commitments of resources occur when a wide range of future management ALTERNATIVE D IMPACTS options are precluded. This section identifies the extent to which the alternatives would irreversibly limit potential resource uses. The individual alternative impacts sections identify those decisions which apply to a particular alternative and the magnitude of the impact. , SOIL AND WATER RESOURCES The loss of soil through wind and water erosion would be irretrievable. VISUAL RESOURCES Mining activities, timber harvest, and land treatment projects, and the construction of permanent structures such as roads, buildings, and powerlines would result in an irretrievable loss of visual resources. ARCHAEOLOGICAL AND HISTORICAL RESOURCES The loss of archaeological or historical sites and information would be irretrievable. DISPOSAL OF PUBLIC LANDS Disposal of 7,986 acres of public lands would result in a loss of administrative control of all resource values on these lands except valid existing rights and existing land use authorizations. IMPACTS OF ALTERNATIVE D IMPACTS ON SOCIAL AND ECONOMIC CONDITIONS IMPACTS FROM PROPOSED MANAGEMENT ACTIONS Impacts from Oil, Gas and Geothermal Management. The Planning Area would not experience measurable social or economic impacts because of the low potential for occurrence of these resources. Impacts from Wildlife Habitat Management. Increases in forage supply would translate into increases in game populations and in recreational activities associated with them and would lead to increases in Planning Area income and employment. 4-39