Task: Question Answering
Input (English): Passage: Wyoming's territorial Governor Francis E. Warren visited Rock Springs on September 3, 1885, the day after the riot, to make a personal assessment. After his trip to Rock Springs, Warren traveled to Evanston, where he sent telegrams to U.S. President Grover Cleveland appealing for federal troops. Back in Rock Springs, the riot had calmed, but the situation was still unstable. Two companies of the United States Army's 7th Infantry arrived on September 5, 1885. One company, under the command of a Lieutenant Colonel Anderson, was stationed in Evanston, Wyoming; the other, under a Colonel Chipman, was stationed in Rock Springs. At Camp Murray, Utah Territory, Colonel Alexander McDowell McCook was ordered to augment the garrison sent to Wyoming with six more companies.On September 9, 1885, one week after the massacre, six companies of soldiers arrived in Wyoming. Four of the six companies then escorted the Chinese back to Rock Springs. Once back in Rock Springs, the Chinese laborers found scorched tracts of land where their homes once stood. The mining company had buried only a few dead; others remained lying in the open, mangled, decomposing, and partially eaten by dogs, hogs, or other animals.The situation in Rock Springs was stabilized as early as September 15, when Warren first requested the removal of federal troops, but the mines at Rock Springs remained closed for a time. On September 30, 1885, white miners, mostly Finnish immigrants who were members of the Knights of Labor, walked out of mines in Carbon County, Wyoming, in protest of the company's continued use of Chinese miners. In Rock Springs, the white miners were not back at work in late September, because the company still used Chinese labor. Rock Springs steadily became quieter, and, on October 5, 1885, emergency troops, except for two companies, were removed. However, the temporary posts of Camp Medicine Butte, established in Evanston, and of Camp Pilot Butte, in Rock Springs, remained long after the riot. Camp Pilot Butte closed in 1899 after the onset of the Spanish–American War.The labor strike was unsuccessful, and the miners went back to work within a couple of months. The national Knights of Labor organization refused to support the Carbon strike and the hold out by white miners in Rock Springs following the Rock Springs Riot. The organization avoided supporting the miners along the Union Pacific Railroad, because it did not want to be seen as condoning the violence at Rock Springs. When the Union Pacific Coal Department reopened the mines, it fired 45 white miners connected to the violence. 
Question: What company fired 45 white miners?
Output (English): Union Pacific Coal Department.