 Complete the following phrase:  Successful mining took time and capital, particularly once most of the timber around the Klondike had been cut down. A realistic mining operation required 1,500 42,000 for wood to be burned to melt the ground, along with around 1,000 28,000 to construct a dam, 1,500 42,000 for ditches and up to 600 16,800 for sluice boxes, a total of 4,600. The attraction of the Klondike to a prospector, however, was that when gold was found, it was often highly concentrated. Some of the creeks in the Klondike were fifteen times richer in gold than those in 