Gallinas Mountains, New Mexico, USAi

Regional Level Types
Gallinas Mountains	Mountain Range
New Mexico	State
USA	Country

The Gallinas Mountains are a small but geologically distinctive mountain range in central New Mexico, USA, rising abruptly above the surrounding high plains east of the Rio Grande Rift. The range is centred on Gallinas Peak and forms an isolated upland characterised by rugged ridges, steep slopes, and relatively limited areal extent compared with major New Mexico ranges. Topographically and geographically, the Gallinas Mountains are best defined by their core volcanic–intrusive high ground rather than by formally mapped boundaries, as reflected on USGS topographic maps.

Geologically, the Gallinas Mountains are notable for mid-Tertiary intrusive and volcanic rocks, including alkaline to peralkaline intrusions, trachytes, syenites, and associated breccias, emplaced into older sedimentary sequences. The range hosts the Gallinas Mountains mineral district, which is internationally significant for rare-earth element (REE) mineralisation, along with fluorite, barite, and associated minerals. REE mineralisation occurs mainly in veins, breccia zones, and replacement bodies related to alkaline magmatism and hydrothermal alteration, making the Gallinas Mountains one of the most important REE-bearing localities in the United States. Although large-scale mining has been limited, the area is of considerable interest for economic geology and mineralogy, particularly in the context of critical-metal resources.

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References