The watershed is lightly populated, with most settlements concentrated along the San Juan and Animas Rivers. Farmington, New Mexico is the largest city, with a population of 45,965 at the 2010 census. Other major cities include Durango, Colorado (16,897), Cortez, Colorado (8,482), Shiprock, New Mexico (8,295) and Aztec, New Mexico (6,757). The San Juan Basin supports a large resource extraction economy, with oil, natural gas, coal, helium, alum, clay, fluorspar, uranium and various gemstones as the primary products; historically gold, silver, copper and lead were also produced in large quantities. As of 2009, the over 40,000 wells in the San Juan Basin had produced more than 42 trillion cubic feet (1.2 trillion m3) of natural gas and 281 million barrels of oil.