20th Century By orion.h May 1, 1900 Scofield Mine Disaster At 10:28 A.M. the No. 4 mine shaft unexpectedly exploded. 1906 Open-pit copper mining begins in Bingham Canyon 1908 Natural Bridges is Utah's first national monument 1912 Alma Richards is first Utahn to win Olympic gold metal 1917 Transcontinental telephone link is completed on the Utah-Nevada border 1918 Zion National Park is Utah's first national park 1923 Posey War 1929 The great depression begins 1932 Franklin Roosevelt is elected president 1934 Great drought hits Utah