GRAND CANYON NATIONAL PARK, Ariz., Sept. 18 -- 'These lands have long been recognized as some of the most beautiful in the world.' Wrapping up a series of talks between administration officials and opponents, Clinton remained up past midnight the previous evening in Chicago speaking with Republican Utah Gov. Mike Leavitt and Rep. William Orton, D-Utah, trying to address their concerns, White House press secretary Mike McCurry said. The designation as a national landmark, which does not require congressional approval, would largely block plans by a Dutch-owned mining company, Andalex Resources, to begin digging one of the nation's largest known coal reserves. The deposits beneath the Kaiparowits Plateau are believed to hold nearly 7 billion tons of coal worth as much as $1 trillion, and Andalex has said its mine would employ some 900 people. Andalex still retains its rights to mine the land, but would be blocked by the president's designation from building the roads believed necessary to make such an operation viable. Leavitt, who met administration officials Tuesday in Washington, had been pushing an alternative plan that would classify the land by zones, making some parts tightly regulated wilderness lands and leaving other areas as 'enterprise lands' where development would be encouraged. Clinton's trip to the Grand Canyon, which is southwest of the land targeted for protection, follows a similar visit last month to Yellowstone National Park, where he announced a deal under which Crown Butte Mines agreed to give up its controversial plans to develop a major gold mine just outside Yellowstone in exchange for $65 million worth of federal land elsewhere. Administration officials indicated they were trying to work out a similar deal with Andalex, but the company has said it plans to fight a national monument designation. Administration officials said they also were seeking to compensate the state of Utah for the loss of public land it controlled. The other major holder of a federal coal lease in the Escalante area of southern Utah, PacifiCorp, signed an agreement last Friday with the Interior Department to relinquish 18,000 acres of federal leases in the Kaiparowits Plateau for credits toward leases in other areas. Clinton visited Arizona on the second day of a four-day, six-state campaign trip that began Tuesday with stops in Michigan and Illinois, and was to continue afterward with visits to Washington state, Oregon and South Dakota. It was the president's second visit within a week to Arizona, which a Democratic presidential candidate has not won since 1948. Recent polls, however, have shown Clinton leading Republican challenger Bob Dole by nearly 10 percentage points in the state. The state's two Republican senators, Orrin Hatch and Robert Bennett, also had been meeting administration officials but appeared resigned to a longer fight against Clinton's expected action. Hatch angrily declared Tuesday 'there's going to be hell to pay' if the president moves ahead with his plan. McCurry argued, however, that claims by opponents such as Hatch that Clinton was acting out of election-year political considerations 'would seem to acknowledge there are significant numbers of people who understand the importance of protecting this region.' As part of the administration's efforts to meet the concerns of its opponents, the order will keep the land under the management of the Interior Department's Bureau of Land Management, rather than the National Park Service, to keep it under the control of the agency most familiar with it. In addition, the order will make no changes in rules allowing hunting, fishing or grazing, and the federal government will not claim any new federal water rights, Clinton said. The administration is confident that in using the 1906 Antiquities Act tomake the national landmark designation, Clinton is making 'an appropriate legal use of his executive power as president,' McCurry said. He said the law has been used by presidents throughout the decades to protect important lands and objects, although he noted Presidents Nixon, Reagan and Bush did not believe in such actions. McCurry said the Andalex mine 'would have dramatically changed the nature of this area,' which is home to ancient native American sites and fossil recovery operations. 'This is an area of scientific, historical, cultural and environmental significance that the president felt must be protected,' he said. He said environmental activists wanted to protect nearly 6 million acres of land in southern Utah. The area designated Wednesday by Clinton had been under study for 15 years and was seen as 'most urgently in need of protection.' McCurry in particular blamed Republican lawmakers for forcing Clinton's action by seeking legislation in 1994 that would have expanded mineral mining activities in the newly designated area. Late Tuesday, administration officials and representatives of 15 timber companies signed an agreement under which old growth timber sales in the Pacific Northwest will be replaced with 176 million board feet from alternative sources. The U.S. Forest Service will identify the alternative timber areas between 1997 and 1999.