Sierra Madre Occidental


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Related to Sierra Madre Occidental: Sierra Madre del Sur, Sierra Madre Oriental, Sierra Madre Mountains

Sierra Madre Occidental

 

a mountain range in Mexico, along the western edge of the Meseta Central. The range is about 1,300 km long and 80–200 km wide. Average elevations vary between 1,500 and 2,000 m; the highest peak is Mount Chorreras (3,150 m).

The Sierra Madre Occidental is composed mainly of Precambrian metamorphic rocks with a mantle of younger sedimentary rocks and granite intrusions, overlain by thick layers of Neogene lavas. Gold and silver are mined in the mountains. The range is deeply dissected by river valleys; in the west there are canyons up to 200 m deep. In the northern part of the range, the slopes are covered mainly by xerophytic shrubs; at elevations of about 2,000 m they give way to thin, dry pine forest. In the southern part of the range there are sclerophyll and summer green forests.

References in periodicals archive ?
The Sierra Madre Occidental and the Sierra Madre del Sur act as barriers and provoke intense rainshadows that distort the general distribution model on the regional scale.
For bats, most research has been conducted at the two protected areas of the state; La Michilla Biosphere Reserve in the south (Alvarez and Polaco, 1984; Hernandez Huerta, 1996), over the Sierra Madre Occidental, and Mapimi Biosphere Reserve in the northeastern arid lands (Aragon-Pina and Garza-Herrera, 1999); little else is known for other areas.
The study area was near Madera, Chihuahua, at the eastern edge of the Sierra Madre Occidental, (29[degrees] 19' N, 108[degrees] 11' W; Fig.
In Mexico, Daniela and Pepe visit the village of the Tarahumaras, legendary long-distance runners who live in the Tonachi Mountains in the Sierra Madre Occidental.
The Company's objectives are to explore and develop the San Miguel project, located in Chihuahua, Mexico within the Sierra Madre Occidental gold/silver belt and fully develop the potential of the strategic alliance with Teck Cominco for gold exploration in South America.
Nayarit is located in the Sierra Madre Occidental range, which hosts the majority of Mexico's gold and silver deposits and is considered as the most productive epithermal precious metal region in the world.
The Property is located in the Sierra Madre Occidental silver-gold belt.
The Company's objectives are to explore and develop the San Miguel project, located in Chihuahua, Mexico within the Sierra Madre Occidental gold/silver belt, and fully develop the potential of the strategic alliance with Teck Cominco Limited for gold exploration in South America.
The project lies in the Temoris mining district of Mexico, part of the gold-silver belt of the Sierra Madre Occidental, just a few kilometers northwest of the town of Temoris.
The La Currita project is located in the Temoris mining district, which lies within the northwest trending Sierra Madre Occidental epithermal mineral belt that hosts several multi-million ounce gold/silver deposits that have been recently discovered or are currently in production.
The Company is committed to advancing and adding value to its core assets in the renowned Sierra Madre Occidental of north-central Mexico.
These structures are the primary target of recent mining exploration and discovery in the Sierra Madre Occidental.