Choice of Detector

[Mariner]

Hi All,

First day on this Forum. I had posted the following question on the TreasureNet forum, but was recommended to ask it here instead. Hope somebody can help:

I am interested in a wreck that is about 10 feet below the surface of a tidal mud flat, which seems to be impregnated with salt. At very low tides, the entire mudflat is uncovered, and you can walk (with some difficulty) to the supposed location of the wreck. I am looking for a detector that will go down that far, is imprevious to the salt, and that can discriminate between bronze cannons and silver bars, both of which I would expect to find on this particular wreck.

I tried White's deep penetrating detector, but the salt makes it go crazy.

Any suggestions?

Mariner

 

[jmaryt]

take two and hit to right!..ahhhh!..maybe the new cz21 from fisher!

(h.h!)
j.t.

 

[BarberBill]

Forget thinking discrimination between Silver and Bronze and go with a Pulse Induction diving machine. No discrimination, but unaffected by the salt and plenty sensitive. My two bits.
HH
Bill

 

[Ron from Michigan]

JW Fisher,Minelab Excalibur or a used CZ20.

 

[rmptr]

How about an infinium with a homebuilt large coil?
hh

 

[UK Brian]

As with the other hoard hunting question its obvious that no one has tried any of the machines mention. For depth you need pulse, for salt you need pulse. It has to be a high power pulse not the toys from Garret/Whites/Minelab.
A Lorenz or Pulse Star willl manage the cannons fine but not the silver bars unless they are very large. There is ferrous /non ferrous discrimination on above fist sized objects and they automatically eliminate small trash.
The drawback is the price.
Similar machines to the German ones are produced by several companies in Bulgaria. Build quality is slightly less but prices can be 50% or more lower.
If you require details on the Bulgarian machines I'll dig some links up for you.

 

[Elton]

It will take ground penetration radar to detect that deep..Thousands of dollars in cost.

 

[Mike Hillis]

You dig a hole and it fills with water.

If you are really serious foget the metal detector and get you a rod to probe with. Locate the wreck, figure out someway to excavate it, then get permission and do so.

Save the metal detector to go through all the mud and water you'll be pumping out of that never empting hole.

HH

Mike

 

[Elton]

Your right Mike, remember that Riverboat found a few years back with all the Blue jeans and plates...took months of pumping, and pumping, and they used ground penetration sonar radar to even find the possible resting place..The River had shifted several hundred feet or something like that....They still had to bore hole the sight and pump it dry..

 

[UK Brian]

An expensive ground radar unit can detect large to 40 or more feet in dry sand.
In moist or clay soil this fantastic performance is reduced to a few inches. Pulse is the only option here.

 

[GRAY GHOST]

hello all, youre right elton and mike - to recover anything from the wreck, pumps would be necessary, as well as a cofferdam for containment, not to mention the amount of digging and sifting. mariner, i hope you have help - and lots of it, an operation of this scale would involve large infusions of cash and time. there are many facets to this picture, and you can expect the state archaelogists to get involved if the wreck is on anything but private land. not trying to burst your bubble mariner, i wish you luck and fortitude in this endeavor. if you could pull this off, it would be incredible. hh,

 

[Elton]

n/t

 

[UK Brian]

Everyone is so negative. We don't know the details of the site but whether silver or cannons its something well worth going for if permission can be obtained.

 

[UK Brian]

There's several. Lorenz and Pulse Star. Micron Stinger (12' plus), SDP-2014, the Megapulse III (14' plus) and a couple from the Notsi Mole range. All need the larger search coils around 40" x 40" which can be handled by one person. You wear them, standing in the centre and mark the targets with your feet so weight is not a problem. The really big coils need two, one at each end holding straps.