This is related to "Cueva la Boca."
This is probably old news to some of you, as I recall it being mentioned
on CaveTex about 2 years ago, after I posted a trip report of taking my
family there.
A conservation group in Mexico is working to protect natural habitats.
http://www.pronaturane.org/
I saw on the web somewhere that they were working on a project at a cave
south of Monterrey, called "Cueva la Boca."
According to their web-site, it clearly says they plan to buy this specific
cave.
According to several other sites they have already purchased it:
http://www.pronaturane.org/archivos/Comunicado%20Cueva%20de%20la%20Boca.pdf
David Locklear