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#26

mbasko
Member
From: Central West NSW
Joined: 27 January 2015
Posts: 4,807
Member
28 December 2020 05:30 pm

Back to the coated gold. Here's a vid from Tryhard showing a bit (watch from 5:15 if you don't want to see it all):

Famo in WA:


Everything we use comes from mining or farming.

4 users like this post: grubstake, Bush, ProspectorPete, davent

#27

Bush
Member
Joined: 24 January 2016
Posts: 393
Member
29 December 2020 09:18 am

Deepseeker wrote:

I had a piece just last week from near Rheola, about the size of a large pea. It was dark rusty brown like an Ironstone, and the 5000 loved it loud and clear. However, when I turned on the Iron Reject function and set it to 10, it didn't reject it hmm The Iron reject works as I had been using it on and off all day in a trashy area.

Thinking that maybe there might be some of the good stuff inside, I brought it home with me to test with a magnet (I took the magnet off of the end of my pick handle some time ago, as it was interfering with the NF 25" DD-X as I walked along and it hung down off of my belt near my feet).

When I got home, I got out of the car and took it over to one of our raised garden beds where I use a larger rare earth magnet as part of the system I use to hold the shade cloth down. I was some inches away from the magnet when the rock flew out of my hand and stuck to the magnet. I binned the rock and walked inside, still none the wiser as to what that was all about neutral

Hi DEEPSEEKER,
I just had a thought on your Strange Stone Phenomena.
Is it possible you just tossed a Stoney Iron Type of Meteorite ?
Could be worth digging it back out of the rubbish bin & getting someone to check it out. thumbsup

Last edited by Bush (29 December 2020 09:26 am)


The Needs of Necessity Rides Over Legislative Law. No PHD or Masters Degree then my say is regarded irrelevant.
Knowledge is not Wisdom. Common Sense you were Born with.

1 user likes this post: Deepseeker

#28

Deepseeker
Member
Joined: 13 August 2018
Posts: 1,695
Member
29 December 2020 05:45 pm

I'd prefer not to go there thanks Bush, seeing as our bins got emptied this morning lol cry

Who knows what it was. I've heard so many people say that the Iron reject on a 5000 is everything from dubious to crap, that it may just have been that it was reading it wrong in the settings I was using or something. Thanks for the suggestion anyway.

Last edited by Deepseeker (29 December 2020 05:46 pm)


Try hard not to offend. Try even harder not to be offended.

#29

Bush
Member
Joined: 24 January 2016
Posts: 393
Member
31 December 2020 02:46 pm

mbasko wrote:

Iron stone & steel aren't the same or similar compositions.

Basically iron stone contains iron compound/s in various levels over 15%. Depending on how rich in iron compound it is it might stick to a magnet but won't signal on a detector. Other pieces will signal on a detector & are commonly referred to as hot rocks.
Most sedimentary rocks contain iron to some degree but not enough to be "iron stone".

Steel is a man made alloy that is predominantly made from pure iron & carbon.

p.s. metal detector timings & ground balancing/tracking is designed to remove most of the ground signal. It will also remove some of the target signal too but steel & other metal targets being pure metal will still have a good signal.
That's why it's important to maintain a good ground balance (fixed or manual) or not keep waving an auto tracking detector over a faint signal. If your ground balance is out it can mask faint signals or auto tracking can in some cases balance it out.
In short & in most cases if the ground balance is good it will remove unwanted noise from the ground effects but leave a clear target response on metals.

Confirmation Please in relation to Auto Balancing comment above.
Would it be fair to say if a faint signal of gold was detected and you wave the coil over too many times in Auto tracking the target signal may get cancelled out.
Also does the sound signal vary from iron / steel targets compared to Gold / Silver / Alloys or other metals.
Prefer this answer more so in relation to the SDC2300.

Last edited by Bush (31 December 2020 02:49 pm)


The Needs of Necessity Rides Over Legislative Law. No PHD or Masters Degree then my say is regarded irrelevant.
Knowledge is not Wisdom. Common Sense you were Born with.

#30

goldierocks
Member
Joined: 10 January 2015
Posts: 3,260
Member
31 December 2020 02:54 pm

mbasko wrote:
goldierocks wrote:

So easy to remove the black coating - a rinse in weak hydrochloric acid would do it, and will not touch the gold. Just don't use aqua regia!

After he declined my kind offer lol I told him to give them a soak in brickies acid. They came out nicely.
I don't play around with acids much at all these days with the kids around. Can't go to the shed without at least the 4yo following me.
Aqua regia would be a definite no go for me full stop. Nowhere near set up for using that or reclaiming the gold. tongue lol

p.s. just a caution to. Cleaning an old shed up last year & found some Alibrite that was leaking out the container. Don't know how long it had been there, looked like years, but the original container appears to have deteriorated.

Yes, brickies acid is hydrochloric acid.


Robert Benchley...
I have kleptomania, but when it gets bad, I take something for it.

#31

mbasko
Member
From: Central West NSW
Joined: 27 January 2015
Posts: 4,807
Member
31 December 2020 04:18 pm

goldierocks wrote:

Yes, brickies acid is hydrochloric acid.

It sure is thumbsup


Everything we use comes from mining or farming.

#32

mbasko
Member
From: Central West NSW
Joined: 27 January 2015
Posts: 4,807
Member
31 December 2020 05:06 pm

Bush wrote:
mbasko wrote:

Iron stone & steel aren't the same or similar compositions.

Basically iron stone contains iron compound/s in various levels over 15%. Depending on how rich in iron compound it is it might stick to a magnet but won't signal on a detector. Other pieces will signal on a detector & are commonly referred to as hot rocks.
Most sedimentary rocks contain iron to some degree but not enough to be "iron stone".

Steel is a man made alloy that is predominantly made from pure iron & carbon.

p.s. metal detector timings & ground balancing/tracking is designed to remove most of the ground signal. It will also remove some of the target signal too but steel & other metal targets being pure metal will still have a good signal.
That's why it's important to maintain a good ground balance (fixed or manual) or not keep waving an auto tracking detector over a faint signal. If your ground balance is out it can mask faint signals or auto tracking can in some cases balance it out.
In short & in most cases if the ground balance is good it will remove unwanted noise from the ground effects but leave a clear target response on metals.

Confirmation Please in relation to Auto Balancing comment above.
Would it be fair to say if a faint signal of gold was detected and you wave the coil over too many times in Auto tracking the target signal may get cancelled out.
Also does the sound signal vary from iron / steel targets compared to Gold / Silver / Alloys or other metals.
Prefer this answer more so in relation to the SDC2300.

That would be fair to say although IMO with an SDC it would be rare (but not impossible).

With the first auto tracking PI (SD2200D) the tracking was either on (tracking) or off (fixed). In tracking Minelab said once it picks up a target it should stop auto tracking but if the signal was faint enough, & the coil was repeatedly passed over the response, it may not be recognised as a target but rather ground noise so could track out. They recommended switching from tracking back to fixed when it was thought a faint target response was heard. Switching back to fixed prevented any real targets being tracked out with ground signal.
Auto tracking has been refined through the models from the SD2200D to GP & GPX series including tracking speeds etc. It's my opinion that this further improved against the chance of it happening but it still could. So the recommendation of going to fixed when using tracking has remained as a safeguard. (Most would use fixed on SD/GP/GPX machines anyway particularly from GP3500 on with the advent of the quick track button).
I'm pretty sure that with the advent of the SDC (& GPZ) that Minelab have refined the Auto Ground Tracking (AGT) to a point where tracking out faint signals is unlikely allowing the SDC to be a fulltime AGT detector. I still wouldn't be 100% sure that it wouldn't track out faint signals so I always recommend to minimise passing the coil over what might be a faint target response & scrape some debris/dirt away to see if it brightens up. With the SDC it gives a good response on even the smallest flychit pieces of gold down to <0.01 gram so the chances of tracking a target response out when being careful to not overdo coil sweeps & scraping the ground away is pretty minimal IMO.
I know some people believe the SDC quick track button doesn't do anything but this is one area I believe it is worth using. i.e. if you get a faint signal scrape/clean the general area then off to the side, away from where the faint response is believed to be, perform a quick track before sweeping over the faint signal again. Repeat until target recovered or dismissed as ground noise.
IMO doing that "resets" the tracking back to the surrounding ground & any metallic response should remain even if faint.
Hope that helps Bush & hasn't confused the issue. On nights at the moment so the heads a bit fuzzy lol

By the way even though Minelab say the SDC can "discriminate" metals by tone I would never trust this. You might be able to tell by signal tone in a lot of cases but IMO not all. I've had signals with the SDC (& other detectors) that I swore would be a nail or bit of tin etc. turn out to be gold & vice versa signals I thought would be gold turn out to be a big fugget!

Last edited by mbasko (31 December 2020 05:37 pm)


Everything we use comes from mining or farming.

3 users like this post: Bush, grubstake, Danny13

#33

Muk
Member
Joined: 19 June 2016
Posts: 545
Member
31 December 2020 10:35 pm

You can never be 100 percent sure so dig everything cheers Muk.

#34

Bush
Member
Joined: 24 January 2016
Posts: 393
Member
01 January 2021 04:03 am

HAPPY NEW YEAR FOLKS.
Hunters & Collectors. thumbsup

https://www.youtube.com/watch?v=iQI5fdVCvlU

Last edited by Bush (01 January 2021 04:07 am)


The Needs of Necessity Rides Over Legislative Law. No PHD or Masters Degree then my say is regarded irrelevant.
Knowledge is not Wisdom. Common Sense you were Born with.

#35

SteveG
Member
From: Cairns, QLD
Joined: 04 April 2019
Posts: 63
Member
06 January 2021 09:58 am

It really doesn't matter. You're over thinking this.

Just swing your detector and dig every target.


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