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the 505 got trick yesterday

One way to determine if it is deep iron or a high conductive target is......... X the coil back and forth over the target until you know the exact location it is buried. If the location changes (or the pitch breaks up) when circling around the target, it will likely be iron. If the target seems to stay in the same exact location, continue to slowly X the coil back and forth across the target while slowly dragging the coil toward your feet. Just as the target leaves the field of detection (just before the audio goes away), you'll hear one of two signals. If the audio drops off suddenly, without changing pitch, dig it. If the audio drops down and gives you a low tone or tones, along with the high tone ( I refer to this as a blending of tones or harmonic tones), it is most likely iron. To perform this, you must be running with zero discrimination and multiple tones. Anything discrimination of the ferrous targets will provide a blanked out audio. And anything less than multiple tones will provide the same low tone on all ferrous targets.

As a member of Minelab's Treasure Talk Team, I've sent an article to them that describes this process more thoroughly, along with audio clips so you can actually hear what it is I'm describing. It is not posted to their Treasure Talk site yet. But I will let you know when it appears. In the meantime, try the method I've described and I think you'll be surprised at the difference in tones (as the target leaves the field of detection), between deeply buried iron and an actual high conductive target. HH Randy
 
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