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I'm a bit puzzled on timings, I've pretty much left mine in sensitive extra since getting it and it seems the go-to timing for around here.  I only use mono coils and I'm  basically chasing tiny gold in soils with very low mineralisation, 1 gram is huge for me so we are talking 0.0X to 0.3 gram bits on average that I am chasing.  I was looking at timings charts on this site here and found the two best options for me below, I think.  Sharp appears to be best if using a DD, does that mean I'd be best off sticking with my sensitive extra seeing I use a mono coil or is a DD coil worth considering?

I'm trying to see if there is a way I can scratch out a bit more depth on these little nuggets.

This chart is the one that throws me out the most, basically no timings are "Excellent" for mono coils except Fine Gold, Enhance and Sens Smooth which are more for mineralised soils, only DD coils seem to have Excellent for the timings I'm trying to use for the small gold in mild soils..... ?

minelab-timing-emi-coil-matrix-large.thu

And this chart below describes the two timings I think might be best for me.

7A4B0225-4624-4579-A21B-2DC563E51EE0.jpeg

 

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Good question, Simon.  I always subscribed to the simplistic view that as far as a PI is concerned, and the GPX in particular, the mono will go deeper than a DD but a a DD is needed to make iron rejection work.  It is obviously more nuanced than that and it would be great if Steve or another GPX guru could go into more detail as to what makes a DD more suited to some of these timings than a mono and why a mono appears to be more suited to work in highly mineralized soils than a DD (or at least more suited to the soil timings one would use in highly mineralized soil).

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I may have missed something but I don’t think DD coils are excellent, except for relic hunting. Of course I may be confused.

I have. Found some sub-sub gram nuggets with a dd flipped to mono....if you can get Jonathan Porters vids it might help.

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Yes, I am just confused by the charts seem to be contradictory to what everyone says, they're more indicating mono are better for bad soils and DD for mild soils, that's why I'm asking if I'm not understanding the charts right.

For example it says for Sensitive Extra timing which is the one I use always, it says suitability for DD coils = Very Good, suitability for Mono coils = OK

And Sharp which seems the other timing that would be good for my small gold hunting situation suitability for DD coils = Very Good, suitability for Mono coils = BLANK

Blank definition = Not recommended.

Very confusing.

minelab-gpx-choosing-correct-timing-larg

It looks to me like Coin/Relic mode might find the tiny gold at the most depth in my very mild soils but again, mono coils are not recommended.

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33 minutes ago, fredmason said:

I may have missed something but I don’t think DD coils are excellent, except for relic hunting. Of course I may be confused.

I have. Found some sub-sub gram nuggets with a dd flipped to mono....if you can get Jonathan Porters vids it might help.

Fred, please look closely at the timing tables in Simon’s post and read through the DP GPX reference article linked in Simon’s post.  The optimal coil recommendations for the timing settings in the table seem to have nothing to do with the target of interest (i.e., relics vs. gold) or with iron rejection, it merely states what coil type is considered optimal for that timing setting using relative descriptive terms like  “suitability” (“OK”, Good, Very Good, Excellent) and “coil type X works best...”. The question is what is it (I.e. what characteristic) about a DD vs. Mono that makes optimal for a given soil timing.

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19 hours ago, phrunt said:

only DD coils seem to have Excellent for the timings I'm trying to use for the small gold in mild soils

Chase...I did read his post and it appears to me that he has mis-read the text. I do not see dd listed as excellent for any use he proposed...If I am WRONG it won't be the first time.

I don't know why those settings work for what they say, but, I am not a person that dissects every thing. Like my cars I just want to get in and go.  I loved my 3500 because one setting ( suggested by JP) did it all. I also had a 5000 but I rarely messed with those setting and have forgot what they were...but it was pretty much the same thing. Turn it on and go.

I will leave the thinking to those with a brain...

respectfully

fred

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Hey Fred,

I am just confused no doubt about it and I'm probably just misunderstanding the charts, but this is the bit I was talking about.  I've circled it in Red, you'll note for the column about mono coils below it they're not overly good at all in that range with sensitive extra and sharp timings.

1741185746_GPXTimingscircled.jpg.2f1f26a4166ba9f1c1044986d501f9bf.jpg

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Charts are generalities only just to give you someplace to start. For instance there is nothing there about coil size. I used Sharp a lot with a mono in Alaska but I had larger deeper gold. For tiny gold I would lean small mono and Sensitive Extra. When in doubt just do a little field testing.

I think what they are thinking there is that with hotter timings in very bad ground a DD may alleviate issues encountered with a mono, but your ground is mild.

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Sometimes I wish I was a geek or at least had a brain...

The timings are at the top from left to right. Reading down lists effective uses

Your quote above says DD are Excellent-but, only for the coin/relic mode...Below that Mono ok in SENS Ex then g,g e,e,e  for the other modes.

Personally, I think you should use fine gold, enhance or sensitive smooth if you want to use Mono coils or your new X coil.

BTW: coin/relic was never intended for small gold and the DD was needed for discrimination- one of minelabs attempts at humour I think.

all this chart is for the 5000

fred

 

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Ok, I think it's sunk in to my foggy melon.  Sensitive Extra (like I've been using) and Normal should be my best bet then, using a smallish mono coil.

The pictures on the charts were confusing me, this one confused me the most.

219833145_timingpictures.jpg.16f902a9f6b38946c4937a5d7da742ad.jpg

It shows in coin/relic a tiny target being detected at the most depth, deeper than any other timing for a tiny target.

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