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Wondering, Pondering TDI

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  • Wondering, Pondering TDI

    In the area where I live the old schools burned coal for heat. During the years of coal use they disposed of the coal waste on the school property. This waste will easily attract to a magnet and has almost completely shut down the hopes of ever finding metal targets over 2" deep. “I’ve actually buried coins at measured depths years ago that my detector can’t locate now, some quite shallow”
    I have a couple areas that were used by adults to play ball for over 75 years (other ball fields where no waste was disposed of have produced many nice coins, rings and relics). We have yet to find the kind of treasures that should be there. I have experimented with the soil in this area for more than 8 years now and can say it is impossible to detect a clad dime at more than 3-4" deep in these areas, or put it in another way, “yet to find over 4” deep”. There has been more than 15 different metal detectors (Tesoro Vaquero, Tejon, Lobo, Garrett Ace 250 and AT Pro, Whites DFX and V3i, Minelab Explorer SE, Etrac CTX 3030 and XP Deus etc.) used in attempts of locating buried targets in these areas. I might add one interesting note, the Etrac and CTX, if in auto sensitivity will throttle down to around a setting of 8.
    As a final attempt I recovered a sandwich bag of the material and sent it to Dave J. at 1st Texas and Carl Morland at Whites for analysis. Both Dave and Carl suggested the following: Since this material attracts to a magnet the typical VLF machines are useless and only a PI machine might produce results. (Since there is no guarantee of success they both stated “might produce results”. He did suggest borrowing a Whites TDI or some other PI machine in hopes of penetrating the soil in these areas.
    In addition, Gene Scullion has loaned me many machines to do trials in these areas. The only machine that has come close to working is the Gold Bug Pro.
    I would also like to add that there is very little grass growing in these vast areas I call the bad lands.
    There are many such sites within 35 miles that could hold some fantastic finds, but that is yet to be proved. I’ve invited many PI users to hunt these areas but so far no takers.
    This drives home the fact, you can't buy one machine that works best at every location.......But maybe 2 will.............
    Now you know why I’m inquiring about the TDI.



    OOPS I've rambled enough

  • #2
    IB detectors, such as the Matchless, inherently ignore ferrous. So your best bet may be a less technical homebuild.
    2 friends of mine used a magnetic rake to clear scrap from an old miners camp...and pulled 6 ounces(gold) from the area their camp was on.

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    • #3
      Hi Tim,

      I think markg discovered the TDI was very useful for his conditions. I'm sure he posted positive results both here and on other forums. Unfortunately I don't have them bookmarked.
      One of the strong points of TDI, is that they are very versatile.

      Another member here, Jose, built a version of an earlier P.I which works on the same principles. https://www.youtube.com/watch?v=GEd9_PoW9bE

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      • #4
        OK. Yeah, over here we have The TDI-pro-Oz series, for the ironstone. Josè s' was a Goldscan4 I see.

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        • #5
          Yes, they share the same principle of operation. The TDI is a refinement. Reg posted a chart for TDI users. Jose's video demonstrates the underlying principle.

          http://www.findmall.com/read.php?73,1910809

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