soils!Garland, a suggestion. Why doesn't RTM run one north south survey line through the middle of both the magnetic high, as well as the magnetic low, using the MMI soil sampling method. It would be a cheap way to potentially see what's beneath that ground. Run it with 50 meter stations and if there are any positive indications, then go back and fill in with 25 meter stations. I'm sure SGS would give quick turn around with results.