"New" Metal Detectors Designed for Gold

[Bret Cahill]

Some of these new machines cost $4,000. They claim they are specifically tuned for gold nuggets.

Is there any real advantage over older technology or is this a scam?


Bret Cahill

 

My qquestion is can it discern from a tungsten core fake. There are alot of allegations flying around about that sit and with the dealings with Venezuela and Germany lately, the only country hot to get their gold into the US is Ukraine, and we paid for that government unbeknonst to most.

But it doesn't matter in the grand scheme of things. Wwe are no longer on the gold standard, we are on the fossil fuel standard.

 

[RobertMacy]

On Wed, 22 Oct 2014 23:10:09 -0700, Bret Cahill <BretCahill@aol.com> wrote:

Some of these new machines cost $4,000. They claim they are
specifically tuned for gold nuggets.

Is there any real advantage over older technology or is this a scam?


Bret Cahill

Don't know. How well did the 'old' machines perform?

Need some specific Manufacturers, model numbers, exact URL's to find these
things

In general, I've seen two approaches: intrumentation based upon scientific
principles which operate independent of the Operator and those that do
something which to some have unique repetitive responses when near gold
[treasure] [note the involvement of the Operator].

One MUST keep in mind that science DESCRIBES what we observe, science does
NOTdefine it. So, with that in mind and knowing the human brain is a
wondrous object it is worthwhile to keep an open mind. A primary example,
waterwitching. The 'instrumentation' is a pair of rods AND the human.
Doesn't work for everyone.

So, are these new machines for $4,000 a 'cheaper' pair of rods?


PS: the 'scientific' machine. albeit must be close to the sample, is
capable of getting pretty close to identifying the material based upon the
resitivity AND the conductivity as a function of frequency. note
independent of Operator. and those should cost around $150 to a DIY

 

[Bret Cahill]

Some of these new machines cost $4,000. They claim they are
specifically tuned for gold nuggets.

Is there any real advantage over older technology or is this a scam?


Bret Cahill


Don't know. How well did the 'old' machines perform?

Need some specific Manufacturers, model numbers, exact URL's to find these
things

Here's a typical site:

http://www.metaldetector.com/learn/buying-guide-articles/gold-prospecting/whats-the-best-gold-prospecting-metal-detector

The plan was to rent one for a day or two after a good rain has deepened / shifted a wash by a few feet. This may happen once or twice a year. In August few will be in the wash before UPS ground delivers the rental detector.

It's mostly an excuse to get exercise.

 

[RobertMacy]

On Thu, 23 Oct 2014 14:26:27 -0700, Bret Cahill <BretCahill@aol.com> wrote:

...snip....
Here's a typical site:

http://www.metaldetector.com/learn/buying-guide-articles/gold-prospecting/whats-the-best-gold-prospecting-metal-detector

The plan was to rent one for a day or two after a good rain has deepened
/ shifted a wash by a few feet. This may happen once or twice a year.
In August few will be in the wash before UPS ground delivers the rental
detector.

It's mostly an excuse to get exercise.

ALL of the ones I saw there, except pulsed induction, which is a
completely stupid approach! can be done as DIY projects for less than
$150. If you have parts lying around, really really cheaper.

All these metal detectors are 'elegant' eddy current systems. They create
a magnetic field that induces current into the remotely located conductive
bits. The currents induced in those bits create a 'reflecting' field that
the coil, or separate coil, picks up. Based upon magnitude and phase of
the returning signal it is possible to identify the material. [I'll send
you some images of my NDE Instrumentation to show what is possible. Note
in the image although the difference in conductivity between the rivet and
the background aluminum slab is a small ratio, how with high contrast the
rivet appears to not exist. AND the slight color change across the field
of view where pressure between the two aluminum slabs is increasing
towards the mounting rivet (conductivity increases with pressure between
to materials)]

Also, magnetic fields decrease at the ratio of inverse CUBE of the
distance so you see there is NOT much signal there. That is reduce going
out AND reduce coming back! So most of these coils operate in what is
called 'near field' where the diameter of the coil is larger than the
distance to the object. They use that approach to skew the decrease -
using a large coil where the field going out decreases by the inverse
square [approx] but the object being small means the field coming back is
going to follow the cube rule. That keeps the S/N up a bit. The pulsed
technique is a way to launch HUGE fields, then watch what happens so the
outgoing signal is not getting into the input signal. It's like, make a
loud noise, then listen, during the loud noise you can't hear, but after
that you can hear stuff. Various reasons a cheap approach, but not an
optimum technical approach where you gain to the real possible S/N.


NOTE: If it's possible to get a system that INCLUDES you, the Operator, as
part of the process; you will be amazed at what you find possible. Won't
work for everyone, probably not even 'scientifically' based [may have even
been proven as ineffective by scientific investigation], but *IF* it works
for you; you will be astounded at what you can accomplish. But, be
prepared this will be a skill, so requires a lot of operation time, and
practise is more valuable if possible to do in known situations.

 

[John Larkin]

On Wed, 22 Oct 2014 23:10:09 -0700 (PDT), Bret Cahill
<BretCahill@aol.com> wrote:

Some of these new machines cost $4,000. They claim they are specifically tuned for gold nuggets.

Is there any real advantage over older technology or is this a scam?


Bret Cahill

That sounds cheap for a backscatter neutron spectrometer.


--

John Larkin Highland Technology, Inc

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

[Bret Cahill]

Some of these new machines cost $4,000. They claim they are specifically tuned for gold nuggets.

Is there any real advantage over older technology or is this a scam?


Bret Cahill



That sounds cheap for a backscatter neutron spectrometer.

That's probably not what they are using. They are probably just using magnetic field.

If that's all that's been through the valley then it would be easy to just wait for a wash to get washed out ~ 1" rain. Some gold would get buried of course but some would become exposed.

Supposedly leaves have high concentrations of gold if the roots reach a deposit.

Since you cannot excavate just mark the locations of palo verde, mesquite and some cacti with high gold concentrations. Then wait until a rain does the excavation for you.