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| Sico Pass | |
|---|---|
| Name | Sico Pass |
| Elevation m | 4090 |
| Location | Chile–Argentina border |
| Range | Andes |
| Coordinates | 24°S 68°W |
Sico Pass is a high mountain pass in the Andes connecting Chile and Argentina near the Atacama Region and the Salta Province. The pass lies on the frontier between South American states and serves as a corridor for cross-border transit, linking regional trade routes, mining districts, and high-altitude communities. It is situated near notable Andean features and has historical, geological, and environmental significance.
Sico Pass sits in the high Puna de Atacama plateau of the Andes, between the Salar de Atacama basin and the Salta highlands, close to landmarks such as Laguna Miscanti and Laguna Miñiques. The pass connects routes that approach from Calama and San Pedro de Atacama on the Chilean side and from Antofagasta de la Sierra and San Antonio de los Cobres on the Argentine side. Nearby administrative entities include the El Loa Province and Los Andes Province in Chile and the Los Andes Department and Salta Province in Argentina. Topographically, it lies among volcanic edifices like Licancabur, Lascar, and Sairecabur and is crossed by the continental divide separating Pacific and Atlantic drainage basins.
The corridor around the pass was traversed for centuries by indigenous peoples such as the Atacameño (also known as Likan Antai) and Diaguita groups, facilitating trade in llamas, salt, and obsidian between altiplano settlements and coastal communities tied to Tiwanaku and later Inca Empire networks. During the colonial era, routes were adapted by Spanish Empire administrators for silver and copper transport to ports like Valparaíso and Antofagasta, and the area was impacted by the mining booms associated with Potosí and later the 20th-century South American mining expansion. In the 19th and 20th centuries, nation-state border delineations between Chile and Argentina—involving treaties such as the Boundary treaty of 1881 between Chile and Argentina and arbitration episodes like the Beagle Channel arbitration context—shaped customs and military presence near the pass. Twentieth-century infrastructure projects linked the pass to regional road networks promoted by governments including administrations of Salvador Allende era Chile and Juan Perón era Argentina, while later economic integration initiatives such as the MERCOSUR discussions and Andean Community debates influenced cross-border transport policy.
The pass is traversed by a paved international road connecting the Chilean Route 23 with the Argentine RN 51 corridor, used by freight from mining operations in Antofagasta and agricultural goods from Salta. Logistics operators and carriers from firms based in Santiago de Chile, Buenos Aires, Calama, and San Salvador de Jujuy utilize the corridor, and customs transit regimes have been influenced by trade agreements involving Chile with partners such as United States and China investors in mining projects. Seasonal accessibility has historically been managed in coordination with border authorities and regional transport agencies in Atacama Region and Salta Province, while trekking and specialized off-road expeditions use alternate highland tracks linked to settlements including Oasis de Atacama and Pucará de Tilcara.
The pass lies within the cold, arid high-altitude climate of the Altiplano with strong diurnal temperature variation characteristic of puna ecosystems studied by researchers from institutions like University of Chile, National University of Salta, and CONICET. Precipitation is scarce due to the Humboldt Current and South Pacific High influences, producing hyperarid conditions similar to those around the Atacama Desert, with occasional summer convective storms tied to the South American Monsoon System. Flora and fauna include species typical of high Andean ecosystems, such as vicuña, guanaco, Andean condor populations studied by BirdLife International collaborators, and specialized plant communities monitored by programs linked to CONAF and Instituto de Arqueología y Antropología research teams.
Sico Pass is set within a region of Neogene to Quaternary volcanic and tectonic activity related to the subduction of the Nazca Plate beneath the South American Plate, part of the Andean orogeny processes analyzed by geologists from institutions like the Servicio Nacional de Geología y Minería (SERNAGEOMIN) and the Servicio Geológico Minero Argentino (SEGEMAR). The area features ignimbrites, lava domes, and stratovolcanoes linked to magmatic arcs including the Central Volcanic Zone, with mineral deposits—copper, silver, and lithium—associated with nearby basins and salt flats such as Salar de Atacama and Salar de Hombre Muerto, drawing investment from mining companies like Codelco, Antofagasta plc, and juniors engaged with SQM-era exploration. Structural geology shows uplift, crustal shortening, and fault systems comparable to studies of the Altiplano-Puna magma body and regional seismicity monitored by INGV and other seismological networks.
The vicinity of the pass attracts visitors en route between scenic sites such as Laguna Verde, Laguna Blanca, Valle de la Luna, and the archaeological sites of the Atacama Desert and Puna region, with tour operators based in San Pedro de Atacama, Calama, and Salta offering excursions. Adventure tourism companies organizing high-altitude cycling, four-wheel driving, and photography tours link itineraries to protected areas managed by agencies including CONAF and cultural heritage institutions such as the National Historical Museum of Argentina. Scientific tourism, including birdwatching and geology-focused trips, involves collaboration with universities like Pontifical Catholic University of Chile and research stations supported by international partners including Smithsonian Institution affiliates.
Border control at the pass involves checkpoints operated by national agencies including Servicio Nacional de Aduanas (Chile) and Administración Federal de Ingresos Públicos (AFIP)-linked Argentine officials, alongside immigration authorities like Departamento de Extranjería y Migración in Chile and Dirección Nacional de Migraciones in Argentina. Bilateral cooperation frameworks have included joint infrastructure projects and confidence-building measures referenced in diplomatic discussions between the foreign ministries of Chile and Argentina and regional security dialogues involving the Union of South American Nations and other multilateral forums. Facilities support inspection of cargo from mining exporters and tourist traffic, and emergency coordination links the pass with medical and rescue services in regional centers such as Calama Hospital and Hospital San Bernardo in Salta.
Category:Mountain passes of the Andes Category:Landforms of Chile Category:Landforms of Argentina