The largest of the mines are the Sierrita Mine owned by Freeport-Mc Mo Ran and the Mission Mine of ASARCO.
Compared to other mines in Arizona the two mines are large; Sierrita is low-grade.
In the CDP, the population consisted of 1.6% of inhabitants under the age of 18, 0.7% from 18 to 24, 2.8% from 25 to 44, 21.7% from 45 to 64, and 73.3% who were 65 years of age or older. The median income for a household in the CDP was ,213, and the median income for a family was ,369.
As of the census of 2010, there were 21,391 people residing in Green Valley.
The population density was 663.4 people per square mile. The racial makeup of the CDP was 93.35% non-Hispanic White, 0.4% Black or African American, 0.3% Native American, 0.7% Asian, 0.36% from other races, and 0.7% from two or more races.
Temperatures are uniformly hot during the summer and monsoon seasons, with 90 °F or 32.2 °C exceeded on 154 days during an average year, and 77 nights failing to fall below 70 °F or 21.1 °C, including every night during August 2011.
Frosts are relatively rare, occurring only on 37 nights per winter, and only nine days failing to top 50 °F or 10 °C.
Green Valley is twenty miles (32 km) south of Tucson and 40 miles (64 km) north of Nogales, Sonora, Mexico.
Surrounded by copper mines, and near the cycling, hiking and birding areas of the Santa Rita Mountains, Green Valley is an unincorporated retirement community composed of 59 Homeowner Associations.Most of the water users and utilities are now members of USCPUG.The organization has published an analysis and projection of area water use through 2030.Continental is to the east of Green Valley, on the other side of the river.According to the United States Census Bureau, the CDP has a total area of 26.3 square miles (68.0 km²), of which, 26.2 square miles (68.0 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.08%) is water.4.9% of the population were Hispanic or Latino of any race. As of the census of 2000, there were 17,283 people, 9,995 households, and 6,296 families residing in the CDP.