Doña Ana Mountains

The range is heavily eroded and largely barren of vegetation, exposing some 130 square kilometers (50 sq mi) of bedrock.

The middle section is Eocene lava flows and volcaniclastics (broken volcanic debris) of the Palm Park Formation,[4] which were erupted about 43 million years ago.

Beds of the Dona Ana Rhyolite ash flow tuff are up to 440 meters (1,440 ft) thick.

Limited mining of these deposits took place during the early 1900s, producing just $5000 in copper, silver, and gold.

There is limited potential for lead-zinc, gold skarn, and carbonate-hosted replacement ores at depth below the surface.