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More Gold For The 10" X Coil

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Managed to christen the 10" coil with a few nice bits. Was detecting for almost 4 days and found nothing until one hour before having to leave to go home👎

I went to an area my mate found 4 bits a few years ago with his zed. Id been back with my 4500 and the zed but never found anymore. This time i had the 10" x-coil on and was running very conservative settings (sensitivity 3) and easily picked up a murmur in the threshold. At around 3 inches i got a 0.10 gram bit. 

The past few days id been testing how deep i could get a 0.06 gram piece of gold with the 10" and found some settings that were still usable in the surrounding ground but punched deeper than factory settings or those that id been using.  So after finding the first bit i went over the same ground again using these more aggressive settings and soon heard a nice clear signal that was repeatable. Digging quite deep out popped a nice 1.53 gram piece of gold. 

The first two days i had been using semi auto and trying to balance the ferrite the best i could but got many  signals that ended up as nothing. Im presuming these were x signals due to the fact the coil wasnt balancing out the ferrite properly. 

Anyway the rest of the time i decided to ditch the semi auto ground balance and went with auto. I felt things were better in auto and spent less time investigating phantom targets and more time digging those pain in the rear shotgun pellets.

My overall impression is im happy with the 10" and found it awesome at getting into areas the 14" just dosnt fit. I weaved it in and around thick clumps of grass/weeds. I can see this coil as being my everyday go to coil due to the lightness and ease of use around thick bush.

I did spend a lot of time with the 20" coil and haven't come to a proper conclusion whether i like it all that much yet. I need to do some more testing to come to a correct conclusion on that one.

I did find that i had to lower the threshold a fair bit to make it manageable. But the ground was wet from showers every night which might of upset the larger coil. It picked up plenty of small deep targets so i know it works well but id like to see how it compares to  the gpz19 (my mate has one).  

The coil didnt feel too heavy and i swung it over hills that i could barely walk on due to steepness and walked for around 10 km - 12 km that day looking for a patch.

Like i said not really enough time on the zed and the 20" to form a correct opinion, more about what i found from a few days of using both coils. so far thumbs up for the little 10".    


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4 hours ago, Jin said:

My overall impression is im happy with the 10" and found it awesome at getting into areas the 14" just dosnt fit. I weaved it in and around thick clumps of grass/weeds. I can see this coil as being my everyday go to coil due to the lightness and ease of use around thick bush.

That’s been the desire since day one. Exact same issue here in thick sagebrush and boulder piles in hydraulic pits and gully bottoms.

A thought for anyone with these small coils. The CTX battery will run a GPZ for a half day and between the smaller coil and CTX battery should knock about a pound off the GPZ. Could make it an entirely different detector on the arm and negate the need for the harness for some. If anyone has a chance to try this please weigh and report. Thanks!

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I don't have a CTX battery, but here were the weights of the coils I got (coils +cables, no shafts). Even though it's only a little over 250 grams lighter, the 10" (with the stock battery) feels like something I can swing without the bungee. The 12" feels like I'd still need a bungee for a full day, but if I forgot the bungee I could make it through a day by taking breaks.

I guess I'd have to add the weight of the patch on too. Overall, not quite as much weight savings as I had thought initially, but it's enough to be noticeable.

  Weight (grams)
Z14 Stock Coil 1240
X17 Spiral 1393
X12 Spiral 1133
X10 Bundle 988

250 grams = the approximate weight of a Big Mac, for easy visualization of what's being subtracted from the coil end of the detector. :biggrin:

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I always had a CTX battery in my pack for that rare day when I ran the GPZ battery dead and wanted just one more hour detecting. A cheaper and less expensive backup alternative to the stock GPZ battery. It got little use but did save the day a couple times when the GPZ battery was not fully charged for some reason.

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Good idea. Do you know how much less the CTX battery weighs than the stock battery?

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From https://www.detectorprospector.com/forums/topic/680-minelab-ctx-3030-and-gpz-7000-weight-comparisons/

The GPZ battery is larger and at 72 Wh has nearly twice the capacity of the 34 Wh CTX battery. The GPZ battery weighs 13.0 oz. versus 9.0 oz for the CTX battery so you are getting twice the power for only 50% more weight. The batteries are interchangeable so you can use your CTX battery as a backup on the GPZ 7000 or buy a GPZ battery to get extra running time on a CTX 3030.”

A quick search shows CTX battery currently $129 and GPZ battery $195. Both use the same charger.


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59 minutes ago, jasong said:

250 grams = the approximate weight of a Big Mac,

Only you would know the approximate weight of a Big Mac and equate it with differences in coil weight…I love it. Now watch, someone will skim-read your post and ask you how many Big Mac's you're putting on your coil.

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29 minutes ago, flakmagnet said:

Only you would know the approximate weight of a Big Mac and equate it with differences in coil weight…I love it. Now watch, someone will skim-read your post and ask you how many Big Mac's you're putting on your coil.

In total, the GPZ with the 10" X Coil is about equal to swinging around 2 large Coke's, a medium pizza, a soft shell taco, and a Big Mac which your buddy took a big bite out of when you weren't looking, accounting roughly for packaging weight. Also, roughy equal to a 7lb bag of feathers. 

The coil diameter is also equal to 30 barleycorns, or approximately 5/36ths of a fathom.

And all that still somehow makes more sense to me than the pennyweight does. :biggrin:

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Many of the times I go out, I do not find enough gold to pay for a coke or a big mac.  I always thought that was why it was called a penny weight.

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16 hours ago, Jin said:

more time digging those pain in the rear shotgun pellets.

Yes....I know that all too well. :rolleyes:

16 hours ago, Jin said:

My overall impression is im happy with the 10" and found it awesome at getting into areas the 14" just doesnt fit. I weaved it in and around thick clumps of grass/weeds. I can see this coil as being my everyday go to coil due to the lightness and ease of use around thick bush.

👍 Yes yes yes.

16 hours ago, Jin said:

so far thumbs up for the little 10".  

I can't argue with that. Awesome...Happy for you Jin.

Good luck out there

JW 🤠

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