Located close to the city of Zacatecas at an elevation in excess of 2,000 m, the principal salars are accessible all year round with paved highways and gravel roads. The Mexico-Ciudad Juarez rail line, passes 60 km southwest from the Caliguey and Santa Clara salars, and just 10 km from La Salada. The closest port access is at Mazatlán on the Pacific Ocean or Altamira/Tampico on the Gulf of Mexico coast, both which could be accessed by rail or road. Power lines cross the claims from the highways in several directions, domestic water is available for human consumption and industrial use. The Zacatecas international airport (Aeropuerto Internacional General Leobardo C.Ruiz) serves both Zacatecas and Fresnillo and is located approximately 15 km north-northwest of Zacatecas. The populations of the city of Zacatecas (approximately 140,000) and Fresnillo (approximately 110,000) have a strong mining tradition with silver and salt mining in the local area.