Gold mineralization associated with alkali trachyte breccia in the Gallinas mining district, Lincoln County, New Mexico
— Lee A. Woodward and Michael S. Fulp

A widespread rock-chip and soil gold anomaly with up to 183 ppb gold is present in an area of brecciated trachyte sills intrusive into the Permian Yeso Formation in the northern part of the Gallinas mining district. There is pervasive silicification, argillic alteration, and iron-oxide staining of the trachyte. Five trachyte breccia pipes are also found in the Gallinas district; a rock-chip sample of one of these pipes contained 44 ppb gold. By analogy with economic deposits in other parts of the New Mexico alkalic gold belt, these anomalies may be indicative of additional mineralization at depth. Gold exploration targets in the Gallinas district include the brecciated sills, exposed breccia pipes, and an inferred breccia pipe at depth beneath the mineralized sills.