Carl Lumholtz 
New Trails in Mexico [PDF ebook] 
An Account of One Year’s Exploration in North-Western Sonora, Mexico, and South-Western Arizona, 1909-1910

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. The mineral prospects of the region, especially as regards gold, are great. There are numerous large veins south of Sonoita which should be examined and the moun tains of the western desert explored. Free gold which undoubtedly has been encountered in the malpais in the northern part of Pinacate should also be followed up.