A while back, quackaphobe's post got me looking into the airborne survey capabilities some more. Here's a little homework to share................
What equipment is Sage using, and what are the depth capabilities?
"We are currently running an airborne survey using Geotech's VTEM system. I checked the Geotech proposal and Geotech does not provide a statistic regarding expected conductor depth penetration. I have heard of anecdotal evidence that the VTEM system does provide the greatest depth penetration of the current generation of airborne EM systems. We shall see." - SGX
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Some encouraging testimonials and specs are available on Geotech's website:
http://www.geotech.ca/
........"the VTEM survey proved remarkably effective at detecting and resolving conductors in Precambrian basement beneath 100 to 200 m of resistive Paleozoic cover rocks. In one month it has advanced an area of over 4000 km2 from a conceptual exploration play to one that has a dozen-plus accurately located high-priority targets that can be readily evaluated by the standard ground EM techniques used in nickel exploration."
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All companies pump their own equipment as being the best, but even so..... there's some good info on this website. Worth a look IMO. Some mention and graphs for up to 800m deep. Looks like a decent choice of equipment. The main pumps seem to be:
Deep penetration
High spatial resolution
Excellent resistivity discrimination
Detection of weak anomalies
