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#1

Nugget
Member
Joined: 27 November 2012
Posts: 6,041
Member
13 January 2013 02:28 pm

Here are the result from some air testing I did when I first got my AT-GOLD. IDs and tones can obviously vary depending on ground conditions, target orientation and the inclusion of any corrosion etc, but this should give you a rough idea of what to expect from the machine. I will do some more testing in All Metal Mode and post the results at a later date.

Testing was carried out using the stock standard 5x8" DD searchcoil, sensitivity was set at 100%.

Mode = DISC 1
5c piece – mid tone – ID 47 - 18/19cm
10c piece – mid tone – ID 53 - 18/21cm
20c piece – mid tone – ID 61 -20/23cm
50c piece – mid tone – ID 65 - 24/27cm
$1 coin – high tone – ID 76 - 18/20cm
$2 coin – high tone – ID 75 - 15/17cm
Bronze token – high tone – ID 81 - 20/21cm
Junk ring – mid tone – ID 62 – 20/21cm
Modern Pull Tab - mid tone - ID 55 - ?
Old Style Pull Tab - mid tone - ID 60 -?
250ml aluminium can – high tone – ID 76 – 40/41cm
9ct gold ring (med) – mid tone – ID 60 – 21/23cm
18ct gold ring (thin) – mid tone – ID 63 – 21/22cm
Threepence (.925) - high tone - ID 77 - 18/20cm
Sixpence (.925) - high tone - ID 83 - 18/20cm
Shilling (.925) - high tone - ID 87 - 22cm
Half Penny - high tone - ID 75 - 20/22cm
Penny - high tone - ID 87 - 22/24cm
Gold Nugget 1 gram - mid tone - ID 51 - 13cm
Gold Nugget 0.5 gram - mid tone - ID 40 - 10cm
Gold Nugget 0.4 gram - mid tone - ID 37 - 10cm

Mode = All Metal Mode
Gold Nugget - 1 gram - ID 51 - 17cm
Gold Nugget - 0.5 gram - ID 39 - 13cm
Gold Nugget - 0.4 gram - ID 37 - 12cm
Shilling (.925) - ID 86 - 25cm
Sixpence (.925) - ID 81 - 22cm
More to come!

Just to give you an idea at the depth difference between DISC 1 and All Metal Mode, a Half Penny in All Metal Mode picks up at around 30/32cm.

7 users like this post: WickedWaz, garnethawkins, Arwon, gavfromoz, Brother, Sousdog, Matt80

#2

the duck
Member
From: Yarraville West, VIC
Joined: 18 January 2013
Posts: 2,125
Member
18 January 2013 05:01 pm

thanks for these very handy


Detectors owned and used Compass, Whites, Garret ground hog,Ace 250, Ace 350, AT Pro, Tesoro Vaquero, Tesoro Sand Shark, Tesoro lobo, Fischer Gold Bug 2, Tesoro Tejon, Tesoro Cortes, Minelab GPX 4000 and 4500, Minelab Etrac

#3

garnethawkins
Member
Joined: 08 May 2013
Posts: 295
Member
29 May 2013 11:43 pm

Damn that means when mine arrives Im gonna have to check the mid tones just in case its a ring lol


I haven't FAILED to find were the gold IS... I have SUCCEEDED in finding were its NOT!

#4

Toysandthings
Toys and things
Joined: 02 May 2013
Posts: 158
Toys and things
30 May 2013 01:36 pm

Yes, the goldbug DP also lost depth in discrim mode.
Ended up just running in all metal mode.
That and I found at the limits of depth in discrim mode, the
indicators favoured everything being in the low end for iron'
until u had dug down a lot to have less depth and then
the target id would start getting more accurate.
Same in all metal mode except without the loss of depth.
Now in the ground the depth started to be less depending
on the mineralisation.


Swing a detector, Radio control racing or flying.. http://www.Toys-Things.com.au

#5

downhalo
Gone Walkabout
Joined: 14 February 2013
Posts: 188
Gone Walkabout
01 June 2013 03:27 am

Nice! Very helpful mate thank you!..


Prospector for just over 15 years..

#6

poizon83
Newbie
Joined: 17 July 2013
Posts: 5
Newbie
17 July 2013 12:08 am

Hey Nugget have you done water detecting with the At series at all? as im in the market for a detector that i can work the beach in and out of the water.. but im curious as to how it will go at say 1 meter deep? and what would be better do you think and others opinions as well.. The AT pro int... Or the At Gold?
All comments much appreciated..
Regards Poizon83 smile


Whats under the ground?? Curiosity Killed this cat.. But metal detecting resurrected Me!

#7

Ramjet
Moderator
From: Maitland, NSW
Joined: 19 February 2013
Posts: 15,945
Moderator
17 July 2013 12:14 am

I believe the AT PRO is fully waterproof, not the standard headphones tho.
The AT GOLD? not so much.
Nugget will have better info on the AT GOLD?
Search the forum.

Rod


Touch the Frog.
Garrett At Pro, XP Deus, CTX 3030, pin pointer. Oldest find 1807 halfpenny, oldest silver 1854 threepence.

#8

Nugget
Member
Joined: 27 November 2012
Posts: 6,041
Member
17 July 2013 12:25 am

Both the AT Pro and AT Gold are fully submersible up to 3mtrs but only the AT Pro is suitable for salt water use. I haven't needed to fully submerge mine but I've used it many times in heavy rain, muddy conditions and I hose it off regularly. They're 100% water tight. Just remember to lube up the 'O' ring when you replace the batteries.

So if it's mainly coin and relic you're after, the AT Pro is the better option as it's fine for salt water use and has an adjustable notch discrimination (for eliminating pulltabs etc) whereas the AT Gold is fixed.

Nugget.

#9

poizon83
Newbie
Joined: 17 July 2013
Posts: 5
Newbie
17 July 2013 12:26 am

Thanks for the reply..Rod.. after digging around on here i would be best to go the At Pro Int.. as it can handle the salt water and as ive seen the At Gold will not..
Clint. smile

Thanks for the Reply Nugget.. what do you use to lube the O ring with.. Marine grease perhaps?
As for gold I use the xterra 705 for that but at the beach in the wet sand its useless at the best of times lol.
Clint.

Last edited by poizon83 (17 July 2013 12:35 am)


Whats under the ground?? Curiosity Killed this cat.. But metal detecting resurrected Me!

#10

poizon83
Newbie
Joined: 17 July 2013
Posts: 5
Newbie
17 July 2013 11:55 am

Nugget,
what sort of lube would you use for the "O" ring once you have replaced to batteries as i don't want to carode the rubber with the wrong lubricant..
Poizon83.?????????????????

Last edited by poizon83 (17 July 2013 10:59 pm)


Whats under the ground?? Curiosity Killed this cat.. But metal detecting resurrected Me!

#11

Nugget
Member
Joined: 27 November 2012
Posts: 6,041
Member
01 August 2013 06:00 pm

Updated with some gold test results and a shilling.

#12

Pr2cv
Member
Joined: 13 June 2013
Posts: 576
Member
02 August 2013 10:30 pm

poizon83 wrote:

Nugget,
what sort of lube would you use for the "O" ring once you have replaced to batteries as i don't want to carode the rubber with the wrong lubricant..
Poizon83.?????????????????

I would suggest some silicone grease similar  to that used in Nikonos underwater cameras but any quality silicon grease would be fine

.DO NOT USE any Petroleum based grease like Vaseline

Pete

Last edited by Pr2cv (02 August 2013 10:31 pm)

#13

Bingo
Member
Joined: 22 August 2013
Posts: 58
Member
22 August 2013 03:29 pm

Hi...at work we use sapphire silicone grease an all our 'O' Rings. (pump seals etc) works extremely well.


Xterra 705, garrett pro pointer & Lesche

#14

Coinman1983
Member
Joined: 02 September 2013
Posts: 12
Member
05 September 2013 11:45 pm

Nugget please help.i have a AT gold and I'm getting erratic ID readings.
Some times I get a 10-15 then it bounces up to max and back down.im new to detecting and
And only have about 10 hrs on it.im going to watch the instruction vid again tomorrow before I go to the beach on Saturday.do you have any tips on what the basic default settings
I should start on for coin/relic and gold detecting.please help
Thanks coinman

#15

Nugget
Member
Joined: 27 November 2012
Posts: 6,041
Member
06 September 2013 08:30 am

Erratic ID readings could be caused by a number of different factors including trashy or highly mineralised ground (including seawater), EMI (electromagnetic interference), targets that are either large, oddly shaped and / or containing a variety of metals (hence the multiple readings).

Can I ask what settings you are using and the type of ground your were detecting at the time?

Also have a read through this previous post of mine and let me know if you have any more questions.

Nugget wrote:

My advice would be to read the manual inside and out and watch the DVD that came with it, if yours didn’t come with a DVD check out YouTube as Garrett have posted a bunch of instructional videos for the AT-GOLD. Between 50-100 hours seems typical to learn a new machine so don’t get discouraged if you’re not picking it up right away, just keep at it and you'll master it in no time.

Learn how to ground balance properly and do it often, changes in the ground composition can impact the performance and depth of the detector.

Try each mode in different ground conditions to work out which mode works best in what situation. I personally try to use All Metal Mode wherever possible as this mode provides the most depth but you will lose tone ID and the target ID accuracy is supposedly effected.

In time you will learn the different characteristic of common targets. For example on the AT-GOLD, a modern pull tab in All Metal Mode shows up with a target ID of 54-55 while a Gatorade seal shows up as a 42. Knowing this information can help to answer the "to dig or not to dig question", although I highly recommend digging all targets until you get used to the machine.

It's not always practical to use All Metal Mode, for example in trashy areas I use Discrim 1 which helps quieten it down a little, Discrim 1 also provides tone ID which can be very useful for identifying quality targets. You may also want to use Discrim 1 when the detector is being effected by hot ground or hot rocks, ultimately you would want to at least try to use All Metal Mode when searching for gold as this is the preferred mode for maximum depth and sensitivity. I almost never use Discrim 2 but you could once again use this in trashy areas or when searching specifically for coins.

Practice pinpointing, once again the manual or YouTube might be the best place to learn how to do this.

One last thing, don't detect with Iron Audio turned on, only turn it on to test a target then switch it off. Iron Audio combined with other target indicators can help identify trash metal, BUT be aware that Iron Audio can falsely sound on a quality target, this could be due to the angle of the target in the ground, if corrosion is present or if the quality target is sitting right next to trash metal.

Swing low and slow and just have fun with it. I hope everything made sence, its late.

Link: https://www.prospectingaustralia.com.au … d=716#p716

Nugget.

1 user likes this post: gtol29

#16

Coinman1983
Member
Joined: 02 September 2013
Posts: 12
Member
06 September 2013 04:32 pm

Thanks heaps nugget,made very clear sense.

#17

raymondj
Newbie
Joined: 24 June 2013
Posts: 2
Newbie
11 September 2013 05:55 pm

Hi Guys..

Dont know if anyone is interested in this...but fitted a Nel 'Hunter' coil to my AT Gold and did some air tests together with my AT Pro (International) with standard coil... Distances are those that were repeatable and would stop you over the threshold and not just where first heard target.....No discrimination on both machines..AT Pro in 'Pro' mode...AT Gold in 'All Metal Mode'.  Both machines ground balanced.

AT Pro
1 gram gold nugget.....75mm.    5 cent piece......231mm      10 cent piece.......273mm

AT Gold with NEL Hunter coil
1 gram gold nugget......150mm.   5 cent piece....281mm      10 cent piece.......330mm

Last edited by raymondj (12 September 2013 03:30 pm)


...its better to have it and not need it....then to need it and not have it....

#18

GeoKJP
Member
Joined: 24 February 2013
Posts: 36
Member
16 September 2013 02:06 pm

Excellent information.  I have just recently purchased an AT-Gold and love it.  None of the yellow stuff yet, but very soon I hope.


Minelab xTerra 70, Garrett AT-Gold

#19

Brother
Member
Joined: 24 May 2013
Posts: 503
Member
26 October 2013 08:19 pm

Thanks Nugget, great info! I got the AT gold today, Im up the creek this week  big_smile


3 pans, 2 sluice, 3 HIbanker, 1 Garrett AT Gold and no more time for dreaming!

#20

klinga
Member
Joined: 14 October 2013
Posts: 34
Member
02 December 2013 09:21 am

Hi Nugget, as an AT GOLD owner your list is great and I've used it to help with learning the machine.

I've only done coin and relics to begin with but aim to venture into the gold fields. I've seen heavymetal's post re finding gold with the AT gold and he mentions that the id ranges started off in the 40's but as he got closer into the 70's.  With your air tests did you notice this too? The ID ranges between disc1 and all metal are the same aren't they?

Also out of interest I had gotten down to one bar on the battery level and noticed that it seemed to take an eternity to reset in disc1 when trying to pinpoint a target. first pass you'd get an indication, second nothing. wait a few seconds then it would be okay so I think that there is a small lose of operation when the batteries get low. Garrett do say to replace when there is only bar left, but I did read somewhere that you shouldn't lose any performance. (Just something I noticed, new batteries = issue gone).

#21

Nugget
Member
Joined: 27 November 2012
Posts: 6,041
Member
02 December 2013 04:33 pm

klinga wrote:

Hi Nugget, as an AT GOLD owner your list is great and I've used it to help with learning the machine.

I've only done coin and relics to begin with but aim to venture into the gold fields. I've seen heavymetal's post re finding gold with the AT gold and he mentions that the id ranges started off in the 40's but as he got closer into the 70's.  With your air tests did you notice this too? The ID ranges between disc1 and all metal are the same aren't they?

As per heavymetals post, faint targets will generally produce a lower target ID and increase as the signal gets stronger.

The ID ranges are very similar between disc1 and all metal however the depth in which a target is detectable is greater in all metal mode. It's also worth noting that different coil types as well as different soil conditions can produce slightly varying target ID's.

I've got a couple of smaller nuggets to try out now, so I'll do some testing and post back with the results soon.

klinga wrote:

Also out of interest I had gotten down to one bar on the battery level and noticed that it seemed to take an eternity to reset in disc1 when trying to pinpoint a target. first pass you'd get an indication, second nothing. wait a few seconds then it would be okay so I think that there is a small lose of operation when the batteries get low. Garrett do say to replace when there is only bar left, but I did read somewhere that you shouldn't lose any performance. (Just something I noticed, new batteries = issue gone).

I haven't noticed any degrading of performance as the batteries get low, but at a certain point (i.e. after being on one bar for a while) I would expect the detector to start acting up somewhat. I'm using rechargeables and still get the 20-40 hours as per the manual, though I usually switch batteries after reaching 1-2 bars just so I don't get caught.

#22

mfdes
Member
From: Hobart, TAS
Joined: 18 November 2013
Posts: 585
Member
08 May 2014 10:36 am

A couple of additions to the list:

1 cent - high tone - ID 80
Threepence (.500) - high tone - ID 80
2 cent - high tone - ID 83
Florin (.925) - high tone - ID 90


SDC 2300. Tasmanian mad about sapphires and gold.
Check out my blog about prospecting in Tasmania: http://www.appleisleprospector.com/

1 user likes this post: belladonna

#23

Barra_Mad
Member
Joined: 09 January 2014
Posts: 72
Member
30 December 2014 08:45 pm

Hi I got my AT gold about 3 weeks ago and am not sure if it is working at intended. I have conducted some air test in the back yard and listed results below if other at gold owners could replicate and compare.
My settings at time of test where
Ground balance 70 sensitivity max and threshold 00 with coil cover on and maximum surface area presented to the detector with standard coil
All metal mode
Gold .40g scratchy tone 100mm high tone 45mm target ID 46
Gold .23g scratchy tone 60mm high tone 30mm target ID 46
Gold .12g scratchy tone 20mm high tone 5-10mm target ID 49
$1 coin scratchy tone 290mm high tone 160mm target ID 75
20c coin scratchy tone 280mm high tone 190mm target ID 67
5c coin scratchy tone 250mm high tone 130mm target ID 47
22 bullet scratchy tone 120mm high tone 60mm target ID 48
22 shell scratchy tone 160mm high tone 100mm target ID 45

I know nugget went over this but my numbers don’t add up. Target ID is numbers are odd to me. Gold lead and Brass are all reading in the same range on the target ID.
When I have been detecting and ping a target my depth reading will show 10 inches and after digging it I find the target at about 2 anyone had this problem too?


Garret supper sluice, Angus Mackirk AU boss, and one day a geologist

#24

Dignit
Member
From: Melb Eastern Suburbs, VIC
Joined: 15 May 2015
Posts: 1,926
Member
19 May 2015 11:22 pm

Hi all.
I purchased a barely used 2nd hand AT Gold, still with 20 months warranty, for $800 a couple of months ago. My first detector. I love it.
I've been out 5 times. Once at the beach and once at Warrandyte Vic, just to get use to it. I've also done air and ground testing with a range of targets, from coins, iron, foil, bottle caps, pull tabs and a gold ring. After all this testing I've hit the Vic Golden Triangle on 3 occasions, with a good 4 to 5 hours detecting each time (I've got a 2.5 hr drive to get there ..... I'm keen).
I find the hot rocks and soil a bit much for the detector in All Metal mode, even after trialling all sorts of ground balance, threshold and sensitivity (and repetitively watching the Garrett User Videos). In all metal mode I find I'm digging hot rocks and hot clumps of soil. Plus the audio is very erratic.
However Disc 1 is very stable with good depth.
I tend to switch between Disc1, All Metal and Iron Audio modes when I hit a target to get a better sense of what the target is. It's only a push of a button.
I've not struck gold yet. However I have got excited a few times digging up to 30cm depths only to find foil. I'm finding .22 bullets and brass buttons. I figure it's just a matter of time before I hit gold. I have been searching well trodden ground just to get the experience.
I've also been doing quite a bit of online research. The Vic Govt energyandresources website has a wealth of information though it is particularly aligned to attract investment from professional mineral mining companies. It is very technical, and well suited to a geologist. Nonetheless I'm finding I'm picking up some jargon and places to explore. I'm yet to really understand ground surface soil types to look for. Any insight will be much appreciated.
I'll keep you posted if I find any of the elusive gold stuff. Cheers


GPX 5000, pick, Jeep Cherokee, Jayco Swift and gold fever

1 user likes this post: Mackka

#25

Jay44
Member
Joined: 12 November 2015
Posts: 47
Member
15 November 2015 11:41 am

Do you think the AT Gold is a good beggining detector I am considering getting one?


Alpha and Omega the Beggining and the End!!


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