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The Central Mesa Metallogenic Province does not necessarily fit the established definitions of a metallogenic province. Physiographically, it occupies a plateau between the Sierra Madre Oriental and Sierra Madre Occidental that covers approximately 117,000 km2 . It is bounded on the south by the Neovolcanic Axis province and extends northward to the Zacatecasand Chihuahua borders (Fig. 1).

Metallogenically, this is a remarkable province with abundant epigenetic ore deposits: mercury and fluorite in Querétaro and San Luis Potosí, manganese in Zacatecas and San Luis Potosí, tin in Guanajuato and Durango, and polymetallic deposits in San Luis Potosí and at Fresnillo in Zacatecas. CRM (1980) discusses the geology and some mine districts in detail; only general aspects are outlined here.

The geology of the province encloses part of the Sierra Madre Oriental folded limestones, which most probably underlie the province′s predominant volcanic sequence. A possibly noteworthy observation is that the andesitic lava flows in the south become more felsic north of Querétaro with more extensive and abundant rhyolites.

Mines or mine districts considered typical of the province are Fresnillo, in Zacatecas; Real de Angeles, in Zacatecas; and Guanajuato, in Guanajuato; these are discussed in Chapters51 to 53.

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