Iron Oxide / Fe2o3 / Gold

Hi all,

this message is for nugget researchers
detectable nuggets / no gold panning (no beach, desert only)

we are looking to expand our database
on gold fields

if you know it
what is the content of Fe2O3 and Fe3O4
from your hunting area / where you already find nuggets

specify if the field seems to you hard or very hard
photo and color of the earth will be a plus
and with which detector

Thanks !

-------------------------------------------------------------------------------
Detector used : Fisher Aquamanta /

Pulsepower Goldscan 5c / Aquastar / Goldquest SSV3 / Nexus Coronado / Vista Gold

I mostly use Whites TDI PI detectors and Garrett PI detectors when gold prospecting, none of which is fitted with screens to show ground condition.

GoldBug Pro in Western Australia ground show the Fe3O4 indicator to fluctuate between 5-7 bars.

This place do Not accept my pictures ..... If you ask the same question on Treasurenet I shall post the pictures with details and colour of the ground. .... it' s very interesting ground high in Fe2O3 and some gold bearing dry ? salt lakes.

ivanll



Edited 2 time(s). Last edit at 05/09/2019 07:40AM by ivanll.

ivanll Wrote:
-------------------------------------------------------
> I mostly use Whites TDI PI detectors and Garrett
> PI detectors when gold prospecting, none of which
> is fitted with screens to show ground condition.
>
> GoldBug Pro in Western Australia ground show the F
> e3O4 indicator to fluctuate between 5-7 bars.
>
> This place do Not accept my pictures ..... If you
> ask the same question on Treasurenet I shall post
> the pictures with details and colour of the ground
> . .... it' s very interesting ground high in Fe2O3
> and some gold bearing dry ? salt lakes.
>
> ivanll


Thanks ivanll

unfortunately, the baragraphs are not accurate

according to our first return,
at 5/6 on GB pro / there is less than 3% of Fe304
at 7 bars there is at least 4%
what remains weak / remains to know how much
the detector will still detect the gold ....

we find a supplier in germany
Red earth at 16% Fe304 can rise to 22% reduced to powder
and black earth at 10/12%

I open another topic on Treasurenet for photos

-------------------------------------------------------------------------------
Detector used : Fisher Aquamanta /

Pulsepower Goldscan 5c / Aquastar / Goldquest SSV3 / Nexus Coronado / Vista Gold

Sounds like a fools errand. I don't know of very many recreational miners that do assays on nugget beds.

Regards FE304 meters on metal detectors, they aren't stand alone graphs. They have to be interpreted in combination with the phase number and factors like coil size/type and soil moisture content factors.

What would work better is if you solicited soil for you to perform you own assays on. We all would be more than happy to ship you a pound or two of dirt if you pay the shipping. Ship you a yard of it if you pay for it.

HH
Mike

Luckily you don’t have to guess about actual percentages of Fe304, you can apparently measure It directly

[www.zhinstruments.com]



Rick Kempf
Gold Canyon AZ- where there is no gold

Hi Rick,
That is an interesting device. Uses 8 kHz on a 56 mm coil (2.2 inch) so it would never overload.

Could use a magnet.

HH
Mike

Mike Hillis Wrote:
-------------------------------------------------------
> Sounds like a fools errand. I don't know of very
> many recreational miners that do assays on nugget
> beds.
>
> Regards FE304 meters on metal detectors, they aren
> 't stand alone graphs. They have to be interpret
> ed in combination with the phase number and factor
> s like coil size/type and soil moisture content fa
> ctors.
>
> What would work better is if you solicited soil fo
> r you to perform you own assays on. We all would
> be more than happy to ship you a pound or two of d
> irt if you pay the shipping. Ship you a yard of
> it if you pay for it.
>
> HH
> Mike




we are in Europe,
with a lot less, gold ground, than you

if you have other source / geological study for example
let us know ....

I already find a nugget prospector
who buys silica from the mixture with magnetite
to get a reliable % Fe304

there are always guys who want to know why it works
why it does not work
and get better ...

on a constant soil more than 15% Fe304
if you test 10 detectors
whatever the humidity conditions
the best will remain the best

the size of the reel is another debate
depending on the technology used and the size of nugget sought ...



lytle78 Wrote:
-------------------------------------------------------
> Luckily you don’t have to guess about actual perce
> ntages of Fe304, you can apparently measure It dir
> ectly
>
> [www.zhinstruments.com]
>
>



Thanks Rick,

Fisher has one, we're going to get it back

but I still believe that there is somewhere
a guy who already has one and is looking for nuggets
with this extra tool

knowledge has no limit
and we continue to learn
just to do better than others........

I can't relate.

Six miles from where I am sitting right now is a greenstone sulfide gold mine. In reality its just an arsenic leach pit. 15 miles to the east of me is a hardrock gold mine. 25 miles to the north of me are placer mines and anywhere in that area you can get a dozer permit to remove about 20 feet of overburden you can find detectable nuggets.

FE304 isn't really useful for nugget hunting. flour gold concentrations maybe but nuggets.....i dunno. Basalt pegs it out. Hot rocks peg it out. If you are placer testing, trench sampling is better and faster.

However, the FE304 graph is great for locating disturbed ground, anywhere where the ground matrix has been disturbed.

I mostly use it for knowing how to treat iron responses. The higher the FE304 meter, the more attention I pay to iron responses as targets will wrap around faster, so those very low iron response numbers or bounces get a closer look.

Good luck.
HH
Mike

Get some of the red dirt from australia its probably the worst, and some red dirt in calif in the gold fields its pretty hot too. It will run the GB up to the limit on a GB2

Mike, your point is well taken for a nugget hunter - his machine will either be able to cope with the ground or it won’t.

LE.JAG, Alexandre and the Fisher “Euroteam” are busy designing high performance new detecting systems with the goal of being to cope with even the kinds of mineralization which shuts down ALL existing RF based metal detectors. It isn’t possible to do that without being able to devise test set ups with known characteristics. The main culprit in shutting down existing detectors is the concentration of ferrous mineralization which most often manifests itself as magnetite - Fe3O4.

Concentrations above 3% or so are considered extreme mineralization.

Here’s a link to a site with 20 or so articles on the subject from researchers who are working on making mine detectors more reliable - 7 pages or so of links on this site - it’s all highly technical but the bottom line is there are soils that no current metal detector can handle without severe loss of depth or even zero - i.e. overload. Just posted as San example of what kind of science is involved!

[www.gichd.org]

Here’s a cut from the F-75 manual as well as one posted a while back by ElNino77





Rick Kempf
Gold Canyon AZ- where there is no gold



Edited 2 time(s). Last edit at 05/10/2019 08:16AM by lytle78.

I wonder what effect this would have? Any way to discriminate it out without any wrap around? How about a small adjacent non ferrous target?



Rick Kempf
Gold Canyon AZ- where there is no gold

Rick Isn’t there a state office for soil samples that may have the info requested? You surely would get better data and accuracy.