In 1862 the 339 were strengthened by the calling of 200 additional families, who were chosen for their skills and capital equipment so as to balance out the economic structure of the community, the center of which was at St. George. All told, nearly 800 families, representing about 3,000 persons, were called to Dixie in the early 1860s. At least 300 additional families--upwards of 1,000 persons--were called in the late 1860s and 1870s. The Cotton Mission was not the only phase of the calculated drive toward diversification and territorial self-sufficiency. Three other colonies were established with a similar purpose. The town of Mantua, in Box Elder County, was founded as part of a campaign to stimulate the production of flax. Twelve Danish families were appointed to settle in what was originally called Flaxville, to produce thread for use in making summer clothing, household linen, and sacks for grain. Similarly, the town of Minersville, in Beaver County, was founded for the purpose of working a nearby lead, zinc, and silver deposit. With the encouragement and assistance of the LDS Church, many tons of lead bullion were produced for use in making bullets and paint for the public works. The town of Coalville, in Summit County, was also founded as part of a church mission to mine coal. Soon after the discovery of this coal in 1859, it was being transported to Salt Lake City for church and commercial use. Several dozen persons were called to the region in the spring of 1860; improved roads to connect with Salt Lake City were built; new mines were discovered; and scores of church and private teams plied back and forth between Coalville and Salt Lake City throughout the sixties. These mines were of particular importance because of the increasing scarcity of timber in the Salt Lake Valley.