A nice video on smart wireless installation at Barrick, the biggest gold producer in the world that use smart wireless to monitor pressure and pH along the leach pad. Barrick used to do round checking that normally take up to 2 hours everyday for manual checking and might expose possible safety hazards to the workers :
http://www3.emersonprocess.com/Videos/content/EmersonHelpsBarrickImproveTheirLeachingProcess/player.html
You will also have the chance to post questions LIVE regarding wireless in mine topic If you are attending upcoming Emerson Exchange event in Texas, USA :
Session ID : 12-5111
Title : The Wireless Mine
Speaker : Melissa Stiegler
http://www.emersonexchange.org/index.asp