I was curious so I did a little digging around on the 'net. This is what I found. Keep in mind I am not Mayann and have not spoken to her. This is just my best guess from the details she provided.
Terlinqua's Property Owners Ass. has a collection of maps and information here:
http://poatri.org/maps/interactive-maps/north-corazones In the North Carazones section of the map. Near the East Carazones Draw (find the creeks icon in the legend.)
The platt map of the property from that site is here, although very hard to read. The link above is better in that it is an interactive map overlay on Google Maps.
https://7ea2ad2f7af25bfac09f027576dc580c0e6c47e3.googledrive.com/host/0B-m7zbTLd5sgYWd1Vmh6TnNncGM/maps/3-East-North-Corazones.pdf
If one is interested, the GPS coordinates for the partial metal building appears to be: 29.478384 by -103.361064 Looking at Google Maps find the Terlinqua Ranch Airport -1E2. From the north end of the airstrip follow Terlinqua Ranch Rd north and then north east. When it jogs back North look for the cross road coming in from the west called Harald Wayne Rd. From the intersection of Terlingua Ranch rd and Harold Wayne rd. the property is one track to the east. That would be the NW corner of the property. Looking south there is a dirt road running east from Terligua Ranch rd. The frame of the building can be seen on the north side of this dirt track about 600 yards from the main road.
The mountain referred to appears to be called Rattlesnake Ridge and is east of the property and runs roughly north south. The property appears to be about two miles north and a mile west of the boundaries of Big Bend National Park.
https://www.google.com/maps/embed?pb=!1m23!1m8!1m3!1d13894.904653122967!2d-103.37297227509121!3d29.46600557653821!3m2!1i1024!2i768!4f13.1!4m12!1i0!3e6!4m3!3m2!1d29.4762615!2d-103.36222199999999!4m5!1s0x86f202f283c9bcad%3A0xcdd88836be49772d!2sTerlingua+Ranch+Airport-1E2%2C+16000+Terlingua+Ranch+Rd%2C+Terlingua%2C+TX+79852!3m2!1d29.452484!2d-103.396639!5e0!3m2!1sen!2sus!4v1427660397710" width="600" height="450"
Incidentally, looking at the soil web map (yes, I have way too much time on my hands this afternoon) Most of that property north of the 'wash' or arroyo up to the northern property line shows to be "fine sandy loam" and "very well drained" soil with no hard pan, densic or lithic impermeable layer under it. Now on the other side of the gully as the elevation rises up Rattlesnake ridge that is very shallow soil with bedrock at about 8 inches.
The rainfall is listed as 10 to 13 inches per year and elevation is about 3500 feet above sea level. 240 to 280 frost free days. Mean annual temperature is 70 degrees. As I recall this area of Texas is in the 600+ chill hours band for fruit growing. If there is a well on property as she states, and especially if you could do some gabbions in the wash, one could grow the hell out of peaches on about 40% of the 40 acres. Depending on the capacity of the well to do drip line, pecans would be a very lucrative crop.
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