Comarca Minera Geopark
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| Comarca Minera Geopark | |
|---|---|
| File:1 Prismas Basálticos Rodrigo Ruíz.jpg Prismas basálticos geosite, Huasca de Ocampo | |
  Geopark location in Mexico | |
| Coordinates | 20°12′53″N 98°43′50″W / 20.21472°N 98.73056°W |
| Area | 1,848 km2 (714 sq mi) |
| Designated | May 5, 2017 |
| Administrator | UNESCO |
| www | |
The Comarca Minera Geopark is located in the center-south of the Hidalgo state, México. It includes the territory of nine municipalities: Atotonilco el Grande, Epazoyucan, Huasca de Ocampo, Mineral del Chico, Mineral de la Reforma, Mineral del Monte, Omitlán de Juárez, Pachuca de Soto and Singuilucan. These municipalities are articulated by a network of 31 geosites, elected because of their expression of the geological history of the territory and their importance to highlight the relationship between the mining industry and metallurgy, and the creation of historical spaces and cultural development of the region. In addition, they are important for science and education and, mostly, have a significant landscape value.[1][2]
Geology
The most important physiographic element of the Comarca Minera is the Pachuca and Las Navajas mountain ranges, with maximum altitudes in the Peña de las Ventanas (3090 m) and in the Cerro de las Navajas (3212 m), respectively. This orographic set has a general northwest-southeast orientation, and separates the area of the Sierra Baja and Barranca de Metztitlán (at north of the mountain ranges), with altitudes of ~ 1300–2000 m, from the northern end of the Mexico Basin (at south of the mountain ranges), with an altitude of ~ 2200–2400 m. The huge geodiversity of the park, appreciable in its geosites, is due to the fact that two physiographic provinces converge in the area, the Sierra Madre Oriental and the Transmexican Volcanic Belt, as well as two magmatic provinces, one related to the Transmexican Volcanic Belt and the other related to the volcanism of the Sierra Madre Occidental.[1]
The Comarca Minera is characterized by an outstanding geopatrimony, which includes at least five geological (and cultural elements related to geology) that can be considered of international relevance:
- The epithermal system (Ag-Au) of Pachuca-Mineral del Monte, one of the largest in the world; its historical production represents 6% of the silver produced globally during the last five centuries.[1]
- The type locality, on the Cerro de San Cristóbal de Pachuca geosite, of tridymite and cristobalite, minerals discovered by Gerhard vom Rath in the years 1868 and 1887, respectively.[1]
- The basalts with columnar jointing of Santa María Regla, Huasca de Ocampo, popularly known as the "prismas basálticos" (basaltic prisms), described and drawn by Alexander von Humboldt in 1803; They are generally considered the longest in the world (they reach 40 m in length).[1]
- The mining industrial heritage, which includes haciendas de beneficio from the colonial era, as well as various mining works, highlighting those of the English mining period (mid-19th century), with splendid examples of Cornish-type machine houses.[3]
- The Cerro de las Navajas, main point of exploitation and supply of obsidian for Mesoamerica, and exceptional site where it can be found obsidian in its golden and green varieties.[1]
Cretaceous
The oldest rocks in the geopark are limestones and shales of marine origin, of Cretaceous age, which are found in the northeastern portion of the territory and outcrop at the bottom of the Barranca de Metztitlán. It can be seen in the geosites:
- Barranca de Aguacatitla
- Aguas termales de Amajac
Paleogene
During this period the belt of folds and ridges was formed, geographically known as Sierra Madre Oriental, through a compressive process that thickened and shortened the crust and raised the previously formed rocks in the sea to their actual position. Towards the end of this period began the volcanism related to the subduction of the western Mexico. In the northwest sector of the geopark there are deformation structures, mainly asymmetric or even lying folds, of NNO-SSE direction, which can be seen in the geosites:
- Barranca de Aguacatitla
- Aguas termales de Amajac
The volcanic rocks of the Oligocene are found in:
- Depósitos tobáceos de Cubitos
- Mirador Cerro del Lobo
Miocene
The magmatism initiated at the end of the Paleogene extended to the Middle Miocene, being responsible for large volumes of silicic volcanic rocks that constitute one of the most southeastern manifestations of the igneous province of the Sierra Madre Occidental. Associated with these rocks were the epithermal mineral deposits of silver, with an early Miocene age in the case of Pachuca-Real del Monte deposits, and somewhat more recent (late Miocene) for those of Mineral del Chico.
Rhyolitic tuffs of the Tezoantla and Cerezo formations as well as rhyolitic and dacitic porphyry can be seen in the geosites:
- Peña Las Monjas
- Peña del Cuervo
- Las Ventanas
- Depósitos Volcánicos de El Chico
The mineralization of late Miocene can be seen in:
- Obras Mineras El Milagro
Pliocene
The style and composition of volcanism changes, as a result of subhorizontal subduction of the Cocos Plate under North America and configuring the Transmexico Volcanic Belt, which is still active today. Examples of volcanic rocks from the Pliocene are found in:
- Cerro de San Cristóbal (in the homonymous formation)
- Peña del Diablo y Peña del Comal
Fossiliferous lacustrine sediments (with remains of plants and fish) are also from the Pliocene and it can be found in:
- Aguas termales de Amajac
Pleistocene
The volcanism of the Trans-Mexican Volcanic Belt is responsible for the volcanic stream of the geosite:
- Prismas basálticos (dated in 2.58 Myr)
and of the monogenetic volcanoes of Singuilucan, appreciable in the geosite:
- Estructuras volcánicas de la Paila
Holocene
Regarding the exploitation of natural resources, in the geopark territory, and throughout the continent, it was the meeting between the Old and the New World that marked the greatest change; In the pre-Columbian era, obsidian was exploited intensely, and, after the conquest, mining concentrated on precious metals.
As a manifestation of the active geological phenomena, it is located northwest of the geopark the geothermal site (and geosite) of:
- Aguas termales de Amajac (hot springs spa)
Geopark geosites
The geopark is composed of 31 geosites of geological, biological and cultural interest:[4]
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Geopark geosites
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Flora and fauna
Flora
Favored by its physiography of contrasts, reflecting its geological complexity, the territory of the Comarca Minera has numerous biomes that alternate with agricultural and urban areas, supporting a very diverse fauna. In the highest areas (altitudes above 2600 m), with a temperate and cold-temperate climate, there are oyamel forests (Abies religiosa), whose best preservation zone is the Parque Nacional El Chico. The mountainous areas of lower altitude, especially the Las Navajas mountain range and the northern slope of the Pachuca mountain range, are covered by pine forests and mixed pine-oak forests. The diversity of pine species is high, highlighting the patula pine (Pinus patula), the Hartweg's pine (Pinus hartwegii) and the teocote (Pinus teocote), while the most representative of the oaks is the netleaf oak (Quercus rugosa). In the sunniest slopes of the Pachuca mountain range and at altitudes below 2000 m, at the north end of the geopark, it can be found xeric shrublands with abundant cactus such as bilberry cactus (Myrtillocactus geometrizans), several species of biznaga (Mammillaria magnimamma, Echinofossulocactus crispatus) and nopal (Opuntia streptacantha, O. tomentosa, O. robusta), cane cholla (Cylindropuntia imbricata) and mexican fencepost cactus (Marginatocereus marginatus), also severial species of agave (Agave horrida, A. triangularis), higlighting the pulquero agave (Agave salmiana) for its use for traditional pulque production.
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Abies religiosa (Oyamel)
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Marginatocereus marginatus (Mexican fencepost cactus)
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Pine forest (Sierra de las Navajas)
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Cylindropuntia imbricata (Cane cholla)
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Dasylirion acrotrichum (Green sotol)
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Fauna
The variety and alternation of natural and agricultural ecosystems supports an important diversity of birds and reptiles. Among the first, the following species stand out for being easily observable: scarlet flycatcher (Pyrocephalus rubinus), black phoebe (Sayornis nigricans), red warbler (Cardellina rubra), yellow-rumped warbler (Setophaga coronata), house finch (Haemorhous mexicanus), lesser goldfinch (Spinus psaltria), yellow-eyed junco (Junco phaeonotus), black-headed grosbeak (Pheucticus melanocephalus), curve-billed thrasher (Toxostoma curvirostre), broad-billed hummingbird (Cynanthus latirostris), white-eared hummingbird (Hylocharis leucotis), Rivoli's hummingbird (Eugenes fulgens), blue-throated mountaingem (Lampornis clemenciae), Lucifer sheartail (Calothorax lucifer), ladder-backed woodpecker (Dryobates scalaris), golden-fronted woodpecker (Melanerpes aurifrons), acorn woodpecker (Melanerpes formicivorus), black-vented oriole (Icterus wagleri), bullock's oriole (Icterus bullockii), Steller's jay (Cyanocitta stelleri) and green kingfisher (Chloroceryle americana). As for reptiles, more than 30 species have been identified, being more relevant for their emblematic character and for being listed as threatened (NOM-059-SEMARNAT-2010), the mexican plateau horned lizard (Phrynosoma orbiculare). Ammong mammals, they are observed regualry the rock squirrel (Otospermophilus variegatus), mexican gray squirrel (Sciurus aureogaster), ring-tailed cat (Bassariscus astutus), north american opossum (Didelphis virginiana) and eastern cottontail (Sylvilagus floridanus). More elusive, they also inhabit the geopark: white-tailed deer (Odocoileus virginianus), southern pocket gopher (Thomomys umbrinus), coyote (Canis latrans) and the gray fox (Urocyon cinereoargenteus). Also various bats species (Leptonycteris nivalis, Desmodus rotundus, Choeronycteris mexicana, Dermanura azteca). To this biodiversity are included 10 species of amphibians.[5]
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Phrynosoma orbiculare (Mexican plateau horned lizard)
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Junco phaeonotus (Yellow-eyed junco)
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Protected natural areas
National
- Parque Nacional El Chico
- Reserva de la Biósfera de la Barranca de Metztitlán
State-owned
- Parque Ecológico Cubitos
- Parque Estatal Bosque el Hiloche
- Zona de Preservación Ecológica de los Centros de Población Cerro La Paila-Matías Rodríguez
Human settlement
First settlers
According to the geoarchaeological evidence of the Cerro de las Navajas geosite, the territory of the Comarca Minera played a fundamental role in the economic development and military power of the pre-Columbian states of Mesoamerica, as it was the focus control center of exploitation and distribution of obsidian. These activities were carried out successively by the Teotihuacan (100 BC – 650 AD), Toltec (950–1100 AD) and Mexica (1325–1521 AD) cultures, extending to the early colonial period.[1][6]
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Geological explorations
The Comarca Minera for five centuries has been the subject of geological studies and surveys. In particular, it was in the 19th century when Mexican and foreign scientists conducted detailed studies. One of them was the German geologist Friedrich Traugott Sonneschmid (763–1824) who was commissioned by the Monarchy of Spain in 1788 to carry out the improvement of mining, profit and extraction, and to make mineralogical descriptions in New Spain. In the course of twelve years he toured the current states of México, Hidalgo, Guanajuato, San Luis Potosí, Zacatecas, Durango and Jalisco. Product of this commission are several studies, one of them, the "Mineralogical description of the important mining regions of Mexico or New Spain", published in 1804, includes valuable data on the Comarca Minera, such as obsidian and clays of Real del Monte, Pachuca and Atotonilco el Chico, as well as the basalts with columnar jointing of Huasca de Ocampo.
Prussian wise Alexander von Humboldt (1769–1859) toured and described several places of Pachuca, Las Navajas mountain range, the mines of El Morán, Real del Monte, Regla, La Vizcaína, El Jacal and El Encino, as part of the expedition which he did between May 15 and 27, 1803. After his visit, he integrated his observations in his vast scientific work; in his book "Views of the mountain ranges and monuments of the indigenous peoples of America" (1810) he dedicated a chapter to the geosite Prismas basálticos, under the title of "Basaltic Rocks and Cascade of Regla", in which he makes comparisons with those of the Giant's Causeway of Ireland.
After the Independence of Mexico, in 1821, numerous foreign capitals arrived in the country, establishing the first mining companies of English and German investors in the former most productive colonial districts, such as Guanajuato, Jalisco, Zacatecas, Chihuahua, Oaxaca and Estado de México. Some foreign engineers, travelers and diplomats made expeditions and wrote books about the economic possibilities of mining. The most emblematic are: George Francis Lyon, Henry Ward, Joseph Burkart, Henri Guillaume Galeotti, Eugéne Saint Clair Duport, Carl de Berghes and Friedrich von Gerolt.
Mining history
Attracted by the enormous mining wealth of the region, the Sevillian metallurgist Bartolomé de Medina arrived in Hidalgo's territory in 1552. A year later, in the Ex-Hacienda La Purísima (current geopark geosite), Pachuca, implemented the method of amalgamation, also known as patio process; using mercury, this method allowed efficiently extract silver from the ore. The patio process, active until the beginning of the 20th century, was exported to all mining districts of America, from Zacatecas in New Spain to Potosí in Bolivia, becoming essential for the silver and economic boom in the Spanish Empire.[7]
At the beginning of the 19th century, with the Independence of Mexico, mining was opened to English participation. Coming from Cornwall, in the extreme southwest of Great Britain, English mining migration arrived, bringing with it technical knowledge and capital. Huge fireplaces and Cornish houses set up a new industrial landscape. However, despite the large investments and numerous efforts, the English failed to recover their investment. In 1848 they sold their rights to Mexican businessmen.[7][8]
The Escandón brothers integrated foreign technology with local knowledge and rethink the way to extract the ore, bringing a renewed mining bonanza. This period had a 50-year boom; its decline happened due to the depreciation of silver worldwide. The United States Smelting Refining and Mining Company acquired the mining properties in 1906. The American period brought a change of method: the cyanidation. During this period a complex network of air and underground transportation for the mineral was created.[7]
The Americans withdrew in 1947; from that date the statal period that lasted more than 40 years begins. Currently the Compañía Real del Monte y Pachucais the owner, as a subsidiary of Altos Hornos de México and Grupo Acerero del Norte.[7]
Tourism and cultural heritage
Pueblos mágicos (magical towns)
The Pueblos Mágicos tourism program began nationwide in the Comarca Minera, with the designation in 2001 of Huasca de Ocampo, the first in the country. Currently, the geopark includes three Pueblos Mágicos (of the 121 of the program):
Museums in the geopark
- Museo de Mineralogía de la Universidad Autónoma del Estado de Hidalgo
- Museo del Paste
Gastronomy
The pasty is one of the most typical gastronomic elements of the Comarca Minera, it is a legacy of the migration that arrived in the middle of the 19th century from the English Cornwall county. Traditional pasties are those of potato and meat, although a wide variety of fillings has been popularized.
The Gastronomic Route of Pachuquilla, municipal seat of Mineral de la Reforma, is an exponent of the intangible heritage of the Comarca Minera Geopark. The gastronomic tradition of Pachuquilla dates back to 1917, the year in which the sale of prepared foods began. The gastronomic vocation of the locality was consolidated thanks to the construction of the Pachuca-Tuxpan highway in 1930, to the change of headquarters of the municipal seat in 1958, and finally, to the closure of some mines of the district of Pachuca-Real del Monte. With these changes, the number of diners who came here to taste traditional dishes such as pork carnitas, barbacoa and mixiotes, as well as pasties, grew.
The consumption of insects and their larvae such as the gusano de maguey (Aegiale hesperiaris), escamol (Liometopum apiculatum) and chinicuil (Comadia redtenbacheri) is a custom with pre-Columbian roots in various municipalities of Hidalgo, including those that make up the geopark territory. Thanks to their richness in highly digestible proteins, insects, coming from both the terrestrial environment and the aquatic environment have constituted and constitute today a food of high nutritional value in the Comarca Minera.
Administration
Inclusion in the geoparks network
The Comarca Minera was included in the Global Geoparks Network on May 5, 2017, when it was recognized as geopark of the UNESCO. On May 26, 2017, in the Achoma District, Peru, the Comarca Minera together with three more geoparks (Araripe, Brazil; Grutas del Palacio, Uruguay; Mixteca Alta, Mexico) founded the UNESCO Global Geoparks Network of Latin America and the Caribbean – Red GeoLAC – which in 2020 has 7 members. The first meeting of the Red GeoLAC took place in the Comarca Minera (in Mineral del Chico) in January 2018.
Institutions
In the process of candidacy, consolidation and promotion of the Comarca Minera Geopark, numerous educational and / or governmental institutions and dependencies have participated, mainly: National Autonomus University of Mexico, through the Atmospheric Sciences Center, the Geophysics Institute, the Geology Institute and the Institutional Development Secretariat; Universidad Autónoma del Estado de Hidalgo; Universidad La Salle Pachuca; the Hidalgo government, through the Science, Technology and Innovation Council of Hidalgo, the Tourism Secretariat, the Planning and Prospective Unit, and the Training for Work Institute of Hidalgo; the municipalities governments of the nine municipalities of the geopark; the Mexican Geological Service; and the Committee of the Basaltic Prisms Tourist Center.
References
- ^ a b c d e f g Canet, Carles (coord.) (2018). Guía de campo del Geoparque de la Comarca Minera. Universidad Nacional Autónoma de México. ISBN 978-607-30-0760-3.
- ^ "Geoparque Comarca Minera". Official Website.
- ^ "Comité Internacional para la Conservación del Patrimonio Industrial México". Official Website.
- ^ Canet, Carles; Mora-Chaparro, Juan; Iglesias, Arturo; Cruz-Pérez, Miguel; Salgado-Martínez, Érika; Zamudio-Ángeles, David; Fitz-Díaz, Elisa; Martínez-Serrano, Raymundo; Gil-Ríos, Alondra; Poch, Joan (2017). "Cartografía geológica para la gestión del geopatrimonio y la planeación de rutas geoturísticas: aplicación en el Geoparque Mundial de la UNESCO Comarca Minera, Hidalgo". Terra Digitalis. 1 (2): 1–7. doi:10.22201/igg.terradigitalis.2017.2.21.75.
- ^ "Naturalista". Official Website.
- ^ Pastrana, Alejandro; Fournier-García, Patricia; Parry, William; Otis-Charlton, Cynthia (2019). "Obsidian production and use in central Mexico after the Spanish invasion". Technology and tradition in Mesoamerica after the Spanish invasion: 15–33.
- ^ a b c d Ortega-Morel, Javier (1997). Una aproximación a la historia de la minería del Estado de Hidalgo. Universidad Autónoma del Estado de Hidalgo.
- ^ Noticia Histórica de la riqueza minera de México y de su actual estado de explotación. Oficina Tipográfica de la Secretaría de Fomento. 1884.