was to Walter Scott's castle, Johnson replied that he was Mr. Scott's banker. Protection and later history President Herbert Hoover proclaimed a national monument in and around Death Valley on February 11, 1933, setting aside almost two million acres (8,000 km2) of southeastern California and small parts of Nevada. The Civilian Conservation Corps (CCC) developed infrastructure in Death Valley National Monument during the Great Depression and on into the early 1940s. The CCC built barracks, graded of roads, installed water and telephone lines, and a total of 76 buildings. Trails in the Panamint Range were built to points of scenic interest, and an adobe village, laundry and trading post were constructed for the Timbisha Shoshone Tribe. Five campgrounds, restrooms, an airplane landing field and picnic facilities were also built. The creation of the monument resulted in a temporary closing of the lands to prospecting and mining. However, Death Valley was quickly reopened to mining by Congressional action in June 1933. As improvements in mining technology allowed lower grades of ore to be processed, and new heavy equipment allowed greater amounts of rock to be moved, mining in Death Valley changed. Gone were the days of the "single-blanket, jackass prospector" long associated with the romantic west. Open pit and strip mines scarred the landscape as international mining corporations bought claims in highly visible areas of the national monument. The public outcry that ensued led to greater protection for all national park and monument areas in the United States. In 1976, Congress passed the Mining in the Parks Act, which closed Death Valley National Monument to the filing of new mining claims, banned open-pit mining and required the National Park Service to examine the validity of tens of thousands of pre-1976 mining claims. Mining was allowed to resume on a limited basis in 1980 with stricter environmental standards. The last mine in the park, Billie Mine, closed in 2005. Death Valley National Monument was designated a biosphere reserve in 1984. On October 31, 1994, the monument was expanded by 1.3 million acres (5,300 km2) and re-designated as a national park, via congressional passage of the California Desert Protection Act (Public Law 103–433). Consequently, the elevated status for Death Valley made it the largest national park in the contiguous United States. On March 12, 2019, the John D. Dingell, Jr. Conservation, Management, and Recreation Act added to the park. Many of the larger