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Post  rowdy on Thu Feb 21, 2019 8:00 pm

Today I observed a comparison between a Gold Monster and a GPX5000 . Note that it was an air test only but the Gold Monster with the 10" coil could pick up a 0.4 and a 0.8 gram nugget about 2" higher than the 5000 which had a 12" evo fitted and also a 17"x13" evo. which when fitted with the 17x13 evo the gold monster could pick it up about 3 to 4 inches higher. Should the 5000 go back to Minelab for a check up or is this normal.
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Post  adrian ss on Thu Feb 21, 2019 8:55 pm

Yes tiz normal
A vlf will often air test better than a PI plus they are much more sensitive to small gold. especially when operating in the 15 khz to 70 khz range.
I could go in to the details of why it is so but I aint in the mood.  Laughing

The vlf will lose depth in highly iron mineralised ground where the PI excels.
For eg my 2300 will air test a 0.15g nug at approx 3 inches but my gold bug goes well out to 8 inches on the same nugg but in iron mineralised gold field conditions the bug will often only find small gold near or on the surface.

I very much doubt that there is a problem with your 5000


Last edited by adrian ss on Fri Feb 22, 2019 9:16 am; edited 1 time in total
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Post  Mike54 on Thu Feb 21, 2019 11:10 pm

G’day rowdy & Adrian,

I would believe that the actual size of the coils would also have a bearing on the actual hight/depth. The same as the size of the gold would also make a difference to the hight/depth. As Adrian said the PI would beat the VLF on in ground depth in mineralised ground.

Cheers.

Mike.

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Post  adrian ss on Fri Feb 22, 2019 10:00 am

G/day Rowdy.

I have never used a GM but from the vids that I have seen it can be a tad noisy in highly iron mineralised ground. There are some areas in the Triangle where the gold was found in pipe clay near the surface; I would imagine that the Monster would do well there on fine gold if there is any gold still there after the Vsats and gold bugs have done them to death years ago.
For me though even tho I have not used one The GM is a nice machine and when used with a bit of nous and logic it can find gold in tough ground.
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Post  rowdy on Fri Feb 22, 2019 1:47 pm

Thanks for the replies, After seeing this demonstration I was a little confused as I know my 5000 would have easily picked up these size bits of gold in undisturbed ground using these sized coils.
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