Search results
Results from the WOW.Com Content Network
Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur ...
Tequisquiapan (Spanish pronunciation: [tekis'kjapan]; Otomi: Ntʼe) is a town and municipality located in the southeast of the state of Querétaro in central Mexico.The center of the town has cobblestone streets, traditional rustic houses with wrought iron fixtures, balconies, and wooden windowsills, which is the legacy of its 300-year heritage as a colonial town populated mostly by indigenous ...
143928. Website. sanjuandelrio.gob.mx. San Juan del Río is a city (2010 census pop. 241,699) and administration of the surrounding San Juan del Río Municipality (pop. 208,462) in the central Mexican state of Querétaro. The population in for the municipality is 268,408 as of 2015. The city and its municipality have the second-highest ...
La Negra is a silver mine in Querétaro, Mexico. [1] The mine has thirteen known ore bodies, overwhelmingly of silver, but also with smaller quantities of gold, zinc and lead. [2] The mine has a processing mill that can process 3,000 tons-per-day. [3] Tailings from the mine are held behind five tailings dams. [1]
Querétaro. Querétaro (Spanish pronunciation: [keˈɾetaɾo]), officially the Free and Sovereign State of Querétaro (Spanish: Estado Libre y Soberano de Querétaro; Otomi: Hyodi Ndämxei), is one of the 32 federal entities of Mexico. It is divided into 18 municipalities. Its capital city is Santiago de Querétaro.
The aqueduct of Querétaro is an 18th-century aqueduct in the Mexican city of Querétaro. It is a symbol of the city of Querétaro and one of the largest aqueducts in Mexico. It forms a part of the historic center of Querétaro, a UNESCO World Heritage Site. [1] It is 1,280 metres (4,200 ft) long and has 74 arches which reach an average height ...
The Sierra Gorda (lit. 'fat mountain (s)') [1] is an ecological region centered on the northern third of the Mexican state of Querétaro and extending into the neighboring states of Guanajuato, Hidalgo and San Luis Potosí. [2] Within Querétaro, the ecosystem extends from the center of the state starting in parts of San Joaquín and Cadereyta ...
The Mexican Geological Survey developed a database containing geological mining exploration maps at scales of 1:250,000,and 1:50,000. The database was launched in 2003 and contains information of all geological and geochemical maps. [4]