i just bought a minelab gpz7000 yesterday and we ran the quick start, ran it over a little plastic container filled with 0.4 of a gram of match stick head size pieces of gold and didnt hear and change in the pitch of the hum. we have tried fiddling with the settings but can only manage to get the faintest of hums. for already dug up gold you would think it be more prominent of a sound???
help with gpz 7000
- Thread starter gecko
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Help Support Prospecting Australia:
Tiny pieces of say panned alluvial gold will generally not make a detector sound, obviously not even the Zed, small pieces don't add up to a bigger piece unless smelted into a solid piece. Saying that though a solid .1g piece should give a signal on a zed.
A matchstick head sized piece should give a signal.
A matchstick head sized piece should give a signal.
I tried about .4 made up of sub grammers and my 7000 picked it up no worries. I would double check your settings, make sure you have it set to HY and have done a decent ground balance.
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I can't even look at my sdc in the backyard without it going off its head gecko. There's so many pipes and junk around it just screams so without knowing the ins and outs of a 7000, you may have balanced everything out, that could be your main problem.
I agree with Scrounger, but it's not so much the junk, more electrical interference, power lines, household and car noise etc. It'll be totally overwhelmed in those conditions, and a great machine has become deaf. Get away, well away before re-testing.
I made the same mistake, and thought what have I done! My 7000 will not run well in the back yard at all, move away to a more open area but still in town and It's a different story.
Prooz.
Prooz.
Preferably a long way from town. The further away, the more sensitive.
Agree. Dont try testing at home. I cant turn mine on at home without it going off its head. Get out in the field and do your testing away from major EMI sources if you can.
went out for a field test had much better luck ( no gold found ) it seemed to get a nice constant hum but we had a problem we were picking up what seemed to be real dense rock maybe with high concentrate of iron or minerals in it is there a way to tune these rocks out?
Decent ground balance will tune most out but there will always be hot rocks that you cant tune out. Some may have a small bit of gold in them, others are just like a clump of iron.
I generally collect the real strong ones and smash them up when I get home just in case.
I generally collect the real strong ones and smash them up when I get home just in case.
Agree fully with SteelPat. I also have a strong cylindrical Neodymium magnet (drilled and glued into) my pick handle to test the ground and hot rocks. Not definitive, but a good indicator. Also good to remove wire/nails etc from your dig/scoop, thereby saving a lot of time.
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