and eastward respectively. Since there was a lack of white European construction workers, in 1865 a large number of Chinese workers were recruited from the silver mines, as well as later contract workers from China. The idea for the use of Chinese labor came from the manager of the Central Pacific Railroad, Charles Crocker, who at first had trouble persuading his business partners of the fact that the mostly weedy, slender looking Chinese workers, some contemptuously called "Crocker's pets", were suitable for the heavy physical work. For the Central Pacific Railroad, hiring Chinese as opposed to whites kept labor costs down by a third, since the company would not pay their board or lodging. This type of steep wage inequality was commonplace at the time. Crocker overcame shortages of manpower and money by hiring Chinese immigrants to do much of the back-breaking and dangerous labor. He drove the workers to the point of exhaustion, in the process setting records for laying track and finishing the project seven years ahead of the government's deadline. The Central Pacific track was constructed primarily by Chinese immigrants. Even though at first they were thought to be too weak or fragile to do this type of work, after the first day in which Chinese were on the line, the decision was made to hire as many as could be found in California (where most were gold miners or in service industries such as laundries and kitchens). Many more were imported from China. Most of the men received between one and three dollars per day, but the workers from China received much less. Eventually, they went on strike and gained small increases in salary. The route laid not only had to go across rivers and canyons, which had to be bridged, but also through the Sierra Nevada mountains — where long tunnels had to be bored through solid granite using only hand tools and black powder. The explosions had caused many of the Chinese laborers to lose their lives. Due to the wide expanse of the work, the construction had to be carried out at times in the extreme heat and also in other times in the bitter winter cold. So harsh were the conditions that sometimes even entire camps were buried under avalanches. The Central Pacific made great progress along the Sacramento Valley. However construction was slowed, first by the foothills of the Sierra Nevada,