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Thread: Magnometers - Why such a big differene in price ?

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  1. #1
    us
    Oct 2014
    NE Texas
    123
    304 times
    All Types Of Treasure Hunting

    Magnometers - Why such a big differene in price ?

    I am wondering if you really get what you pay for?

    I have been searching for a buried safe for over 2 years.
    The top of the safe is 3X3 feet square.
    It is buried 25 feet in a wet, salty marsh with a high concentration of hematite and some iron ore rocks and some slag.
    Hence, my Pulse Induction metal detector has way too manny hits, and other detectors don't have enough depth and other methods won't work in the salty, hematite, wet soil.

    My best guess is to use a magnetometer in grid patterns.

    I am wondering why the huge variance in prices.
    1) For the low end in price, I found an Earth Magnetometer Model EM2 magnometer on eBat for about $800.
    2) For the next bump in price, I found was to rent a G-858 MagMapper, but could not get insurance for a week to cover the rental (no insurance company would do it, as it is aa $20,000 magnometer). (I spoke with tech support, and they said even with a G-858 the odds of finding my target would be only like 80%)
    3) The next bump in price is some $10,000 magnometer.

    Would I be wasting my money with the $800 EM2 magnometer in such a harse environment trying to go so deep?
    Last edited by barnhse; May 04, 2018 at 06:59 AM. Reason: spelling mistake

  2. #2
    us
    Mar 2003
    Oregon & Texas
    Custom Designs and Prototypes
    1,565
    792 times
    All Types Of Treasure Hunting
    I looked at the EM-2 and was pretty impressed with the resolution. Typical Earth field is 50uT and it has 1nT resolution. It looks to be a single-sensor mag, most mags used for searching have 2 sensors arranged as a differential and commonly called a gradiometer. A gradiometer can be used like a metal detector, a single-sensor cannot unless your target signal is overwhelmingly strong.

    IMO, the EM-2 would do the job but you will probably want to use it to grid-map the area. Ideally, it should have built-in data logging and you could download the data into a mapping program and automagically see the the results. Doesn't look to have data logging, which means you'll need to manually write down the results and then enter it into the mapping program.

  3. #3

    May 2005
    Drake, Costa Rica
    429
    645 times
    I had one of those Dalton (?) things, then a Geometrics 858, and then their cesium mag
    Indeed you do get what you pay for
    80% seems not so bad (what is YOUR confidence level?)
    find someone who has one and pay them for a couple of days of gridding
    Bill
    Last edited by BillA; May 07, 2018 at 08:12 PM.
    barnhse likes this.

  4. #4

    May 2005
    Drake, Costa Rica
    429
    645 times
    talk wit Geometrics, they have a rental dept but they also know the ´local' operators who can make you a map
    Bill
    1637 and barnhse like this.

  5. #5
    us
    Oct 2014
    NE Texas
    123
    304 times
    All Types Of Treasure Hunting
    Quote Originally Posted by BillA View Post
    talk wit Geometrics, they have a rental dept but they also know the ´local' operators who can make you a map
    Bill
    Hi BillA, and Carl-NC,

    I just happend to re-check my post here, I missed any emails I got saying anyone replied to my original post here.
    Very sorry.
    I was not ignoring you.

    I would love to find someone with a Geometrics mag and pay them for a couple of days of gridding.
    Looking for someone, I posted on my local treasure hunting group, but no one has anything.
    Darn.

    Regarding the EM-2, I don't mind manual logging.
    I contacted AlphaLab, Inc. to see if they would rent their cheap Earth Magnetometer Model EM2.
    To my surprise, you can rent an Earth Magnetometer Model EM2 for a month for $260 (plus shipping) and the rental can be applied to purchase price if you decide to buy it.
    I will start saving my loose change.

  6. #6
    us
    Nov 2015
    Western USA
    Garrett AT Gold, AT Max, AT Pro, Ace 350, GTI-2500, Sea Hunter MKII, Infinium LS, Scorpion GS, Pro-Pointer AT, Fisher F75 LTD2, Gold Bug 2, F-Pulse, Whites TM-808, Schonstedt Maggie, Falcon MD20
    215
    503 times
    All Types Of Treasure Hunting
    Magnetometers are specialized tools, that's part of the reason for the price, and yes, you get what you pay for.

    A 3X3 safe is going to be a tough target at 25 feet. My Schonstedt can pick up a well casing at 15 feet, so they can locate ferrous objects at great depth, but it seems that the length of the target is more important than the surface area, as magnetometers are picking up the magnetic signal from the target, and the size of the target is the key factor in the magnetic field it has generated (thanks to the earth's magnetic field). If the safe was say 3X6 you could probably locate it at 25 feet, maybe.

    Try renting a unit, or perhaps buy a used one, and do some grid searching -- the potential reward would warrant the price. If you go used, you could always resell it and recover most of your money, so that's my suggestion. -- Either way, good luck with your search!
    barnhse likes this.
    Money may not grow on trees, but it's often found under them!

  7. #7
    us
    Oct 2014
    NE Texas
    123
    304 times
    All Types Of Treasure Hunting
    Quote Originally Posted by cactusman View Post
    Magnetometers are specialized tools, that's part of the reason for the price, and yes, you get what you pay for.

    A 3X3 safe is going to be a tough target at 25 feet. My Schonstedt can pick up a well casing at 15 feet, so they can locate ferrous objects at great depth, but it seems that the length of the target is more important than the surface area, as magnetometers are picking up the magnetic signal from the target, and the size of the target is the key factor in the magnetic field it has generated (thanks to the earth's magnetic field). If the safe was say 3X6 you could probably locate it at 25 feet, maybe.

    Try renting a unit, or perhaps buy a used one, and do some grid searching -- the potential reward would warrant the price. If you go used, you could always resell it and recover most of your money, so that's my suggestion. -- Either way, good luck with your search!
    Hey Cactusman,

    If the safe is 3X3X4 feet cubed, where the bottom is 24 feet down (the top being "only" 20 feet down), do you think a Schonstedt would find it?
    If so, is there a place to rent a Schonstedt?
    I see on Amazon that a Schonstedt GA-52Cx sells for around $800. Which is bit more than the wife will allow on my "foolishness".
    Would hematite soil and/or iron ore rocks effect a a Schonstedt's readings?

    Thanks
    Last edited by barnhse; May 18, 2018 at 02:09 PM.

  8. #8
    us
    Nov 2015
    Western USA
    Garrett AT Gold, AT Max, AT Pro, Ace 350, GTI-2500, Sea Hunter MKII, Infinium LS, Scorpion GS, Pro-Pointer AT, Fisher F75 LTD2, Gold Bug 2, F-Pulse, Whites TM-808, Schonstedt Maggie, Falcon MD20
    215
    503 times
    All Types Of Treasure Hunting
    Quote Originally Posted by barnhse View Post
    Hey Cactusman,

    If the safe is 3X3X4 feet cubed, where the bottom is 24 feet down (the top being "only" 20 feet down), do you think a Schonstedt would find it?
    If so, is there a place to rent a Schonstedt?
    I see on Amazon that a Schonstedt GA-52Cx sells for around $800. Which is bit more than the wife will allow on my "foolishness".
    Would hematite soil and/or iron ore rocks effect a a Schonstedt's readings?

    Thanks

    That's a great question. I would say it is possible that hematite and iron ore could distort the magnetic field of the safe, as they would have smaller magnetic fields of their own, if they are large enough.

    As for the Schonstedt GA-52Cx picking up a 3X3X4 feet cubed safe at 20 feet, I would honestly say it's iffy, but if you can get access to one, you can certainly try it. If I were you I would look at simply renting one -- call contractor supply stores and ask them if they rent magnetic locators, like the ones surveyors use to find property stakes, and often large hardware stores have one or two available to rent. -- The Schonstedt GA-52Cx is probably the most common one around.
    barnhse likes this.
    Money may not grow on trees, but it's often found under them!

  9. #9
    us
    Oct 2014
    NE Texas
    123
    304 times
    All Types Of Treasure Hunting
    Quote Originally Posted by cactusman View Post
    That's a great question. I would say it is possible that hematite and iron ore could distort the magnetic field of the safe, as they would have smaller magnetic fields of their own, if they are large enough.

    As for the Schonstedt GA-52Cx picking up a 3X3X4 feet cubed safe at 20 feet, I would honestly say it's iffy, but if you can get access to one, you can certainly try it. If I were you I would look at simply renting one -- call contractor supply stores and ask them if they rent magnetic locators, like the ones surveyors use to find property stakes, and often large hardware stores have one or two available to rent. -- The Schonstedt GA-52Cx is probably the most common one around.
    Hey Catcusman,

    Hematite is everywhere where I am searching.
    In fact, if I dig a hole and stick my pin pointer in the hole, it always goes off.
    If I stick my pin pointer in a pile of dirt I just dug up, it always goes off.

    I am interested if a magnetometer will even work in such an environment.
    What do you think?

  10. #10

    May 2005
    Drake, Costa Rica
    429
    645 times
    I am not Catcusman, but I will offer an opinion. A fancy gradiometer with the appropriate software and a good grid should show exactly where the safe is (if there, eh?). A magnetic analomy map will show just that, with a trashy/noisy background you will need a more sensitive mag.
    Get a mag stick and dig some holes, cheap anyway.
    Bill

  11. #11
    us
    Oct 2014
    NE Texas
    123
    304 times
    All Types Of Treasure Hunting
    Quote Originally Posted by BillA View Post
    I am not Catcusman, but I will offer an opinion. A fancy gradiometer with the appropriate software and a good grid should show exactly where the safe is (if there, eh?). A magnetic analomy map will show just that, with a trashy/noisy background you will need a more sensitive mag.
    Get a mag stick and dig some holes, cheap anyway.
    Bill
    Hi BillA,

    So very sorry, I didn't mean to leave anyone out.
    Any information and opinions are very valuable to me.

    I have a good grid.
    What equipment do you suggest?

    With all the information that I have already posted, do you think the EM-2 would do the job?

    Thanks again!

  12. #12

    May 2005
    Drake, Costa Rica
    429
    645 times
    sorry, no exp with the EM2
    me, I would never get (back) into manual logging just from the precision aspect
    you are looking for an independent exploration geologist, try Geometrics for some leads
    Bill

  13. #13
    us
    Mar 2003
    Oregon & Texas
    Custom Designs and Prototypes
    1,565
    792 times
    All Types Of Treasure Hunting
    Barn, you're gonna half to spend some money to find out. No one can possibly answer your question without having tested things under the conditions you speak of. Personally, I'd borrow/rent a mag and test on a similar safe first, not buried of course. Ironically, I used to have one about that size.

    If this lost-safe-story comes from a treasure magazine or one of those 'old west' magazines, then the money you spend is "for entertainment purposes only." Otherwise, it might be a worthwhile venture.
    barnhse and BillA like this.

  14. #14
    us
    Oct 2014
    NE Texas
    123
    304 times
    All Types Of Treasure Hunting
    Thank you BilllA and Carl-NC.

    I will start saving my loose change.

    Spending some money for entertainment value is not really lost money.

 

 

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