I'm only aware of one full installation of Venture Design's MineTracer wireless mesh communications and tracking system at a US-based underground coal mine. Here's some recent info about MineTracer for your viewing and reading pleasure:

**********************

Big Branch Mine (CONSOL Energy) Reference Site Video (Duration: 12m50s)
The MineTracer Communications and Tracking System has been installed and proven in the Big Branch Mine in West Virginia since June 2007. See what the people who use MineTracer every day have to say about it. [Double click video for full screen]
http://ventureminetracer.com/intro.html

**********************

Article: MineTracer Ensures Wireless Communications and Tracking Performance Under MINER Act
Source: November 2008 Coal News
http://ventureminetracer.com/CoalNew...

**********************

Venture Design Services MineTracer advertisement in May 2009 Coal News
P. 37 > http://www.coalnews.net/images/pdf/C...
Venture Design Services MineTracer advertisement in April 2009 Coal News
P.24 > http://www.coalnews.net/images/pdf/C...
Venture Design Services MineTracer advertisement in January 2009 Coal News
P.11 > http://www.coalnews.net/images/pdf/C...

MineTracer From Wholesale Mine Supply
The MineTracer wireless communications and tracking system is now available from the leading U.S. distributor and installer of underground mine radio systems, Wholesale Mine Supply. All system components including personal
and vehicle tracking tags and mobile communicators are MSHAapproved for intrinsic safety under 30CFR Part 23. The MineTracer system is guaranteed to meet MSHA communication and tracking system performance requirements.

Maximum effectiveness for safety and daily operations is achieved with high-accuracy, continuous tracking and 2-way communications availability for all miners at all times. Alternatively, MineTracer tracking can be installed together with existing or new leaky feeder radio systems.

MineTracer is easy to install, use, and maintain. Play the video in the web site below to hear from the people who use the system every day. MineTracer – the right thing to do.

For more information, call (509)
232-8757 or (724) 515-4993, or
visit www.ventureminetracer.com
or www.wholesaleminesupply.com.

**************************************