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hot rocks
- Thread starter coolguy
- Start date
Make sure that you do not have the ground balance in the Lock position....with the machine tracking, you might get a slight rise in audio on a hot rock but after a couple of sweeps, it should disappear... Again welcome to a great site...Richardntn
Have the trac to ground position, the gain to "P" position the dual control to "^" position. adjusted threshold for slight hum. Then pupped search coil on ground. I have adjusted gain up or down and still get hot rocks. I put a quarter in the ground and a bottle cap in a different place. Have a hard time telling where the 25 cents is if i did not know. No problem finding the bottle cap can't disc the cap even when pushing the trigger on hand grip forward. Guess i am just a newbie. any help you can give would be great. this is in coin and jewelry mode.
coolguy
coolguy
may have a problem... Do you have another coil that you could try...someone close by that has a coil...local dealer....
Battery voltage ? With the machine on, pull out the batteries,wait a minute or so and reinstall ? Unscrew coil connector, reconnect...
Wiggle coil wire at the coil with the machine on...do the same at the machine....check under coil cover if you have one....tap coil lightly and see if there is audio response there.... Hope you can get it worked out...If you can't let me know and I'll help thru another avenue... Tnx RichardnTn Backwoods Detector Sales
Battery voltage ? With the machine on, pull out the batteries,wait a minute or so and reinstall ? Unscrew coil connector, reconnect...
Wiggle coil wire at the coil with the machine on...do the same at the machine....check under coil cover if you have one....tap coil lightly and see if there is audio response there.... Hope you can get it worked out...If you can't let me know and I'll help thru another avenue... Tnx RichardnTn Backwoods Detector Sales
Ralph Bryant
New member
You put your left foot in, you take your left foot out, you do the hokie-pokie and you shake yourself about....... 
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n/t
Well first off in C&J mode with trigger forward you will lose the audio signal of some pull tabs. Not bottle caps. And not all pull tabs. The disc only affects the audio signal. You will always get a targets VDI no matter where you have the disc control set at. This is explained in the owners manual. If you don't have one you can down load it off of Whites website. If you do have one you may need to read it again.
Don't quite understand your statement "pumped search coil on ground". Hope you're not banging the coil on the ground. When ground balancing make sure you're over "clean" ground. Use prospecting mode and find a spot that has no metal. Then ground balance how it is discribed in the owners manual.
If the quarter and bottle cap are buried at the same depth you should be able to find the quarter with no problem. Even if you haven't ground balanced properly if you can pick up the bottle cap you should be able to do the same with the quarter.
As far as the hot rock problem, like I said earlier. The disc control only affects the audio signal. Not the VDI. Again, not sure what you mean by "still get hot rocks"
Hope this helps some. If not, ask again.
Don't quite understand your statement "pumped search coil on ground". Hope you're not banging the coil on the ground. When ground balancing make sure you're over "clean" ground. Use prospecting mode and find a spot that has no metal. Then ground balance how it is discribed in the owners manual.
If the quarter and bottle cap are buried at the same depth you should be able to find the quarter with no problem. Even if you haven't ground balanced properly if you can pick up the bottle cap you should be able to do the same with the quarter.
As far as the hot rock problem, like I said earlier. The disc control only affects the audio signal. Not the VDI. Again, not sure what you mean by "still get hot rocks"
Hope this helps some. If not, ask again.
Depending upon where you live, you might have some coal clinkers around and I know many have confuced them with "hot rocks."
A "Hot Rock" is any rock which is out of context with the associated ground matrix ... AND ... it could be any rock or intense mineral body (even a dirt clod) that is reactive due to the detector's GB setting.
You can have a Hot Rock and a Cold Rock, but you seldom hear about them. A hot rock is a more intense mineral than what you're ground balanced for and it will cause a nulling when swept over. A cold rock is one which is well below your GB setting and therefore you might get a beep on it .. BUT ONLY IF IN THE ALL METAL/PINPOINT MODE.
If you properly adjust your GB for the general ground at a site and then LOCK the GB on your MXT, you could have a little problem if the bad rocks are close to the coil and depending upon your Discriminate setting.
I prefer to GB over the most mineralized rock or ground that I encounter at a site, then 'Lock' the toggle so I don't track to the changing ground. As a rule, this will eliminate or reduce most of the problems associated with 'Hot Rocks.'
Flipping your toggle trigger forward in the Coin & Jewelry mode will not knock out Hot Rocks. It is only a preset notch that is activated to deal with certain pull tabs type targets.
If you can't reject a bottle cap (and I am referring to the crimp-edge style bottle cap and not the taller, aluminum screw cap) and have very poor signal response from a quarter laying on the ground, you need to have your coil and/or detector checked out.
Monte
A "Hot Rock" is any rock which is out of context with the associated ground matrix ... AND ... it could be any rock or intense mineral body (even a dirt clod) that is reactive due to the detector's GB setting.
You can have a Hot Rock and a Cold Rock, but you seldom hear about them. A hot rock is a more intense mineral than what you're ground balanced for and it will cause a nulling when swept over. A cold rock is one which is well below your GB setting and therefore you might get a beep on it .. BUT ONLY IF IN THE ALL METAL/PINPOINT MODE.
If you properly adjust your GB for the general ground at a site and then LOCK the GB on your MXT, you could have a little problem if the bad rocks are close to the coil and depending upon your Discriminate setting.
I prefer to GB over the most mineralized rock or ground that I encounter at a site, then 'Lock' the toggle so I don't track to the changing ground. As a rule, this will eliminate or reduce most of the problems associated with 'Hot Rocks.'
Flipping your toggle trigger forward in the Coin & Jewelry mode will not knock out Hot Rocks. It is only a preset notch that is activated to deal with certain pull tabs type targets.
If you can't reject a bottle cap (and I am referring to the crimp-edge style bottle cap and not the taller, aluminum screw cap) and have very poor signal response from a quarter laying on the ground, you need to have your coil and/or detector checked out.
Monte
Ralph Bryant
New member
"Hot Clods"......
I think you just coined another new phrase for the benefit of metal detecting posterity.
>>>..."You can have a Hot Rock and a Cold Rock, but you seldom hear about them. A hot rock is a more intense mineral than what you're ground balanced for and it will cause a nulling when swept over. A cold rock is one which is well below your GB setting and therefore you might get a beep on it ...<<<
oops ! I think you got that backwards. Positive hot rocks beep, negative cold stones null. You can balance out the later, former are the real problem.
Ralph
I think you just coined another new phrase for the benefit of metal detecting posterity.
>>>..."You can have a Hot Rock and a Cold Rock, but you seldom hear about them. A hot rock is a more intense mineral than what you're ground balanced for and it will cause a nulling when swept over. A cold rock is one which is well below your GB setting and therefore you might get a beep on it ...<<<
oops ! I think you got that backwards. Positive hot rocks beep, negative cold stones null. You can balance out the later, former are the real problem.
Ralph
Jackpine Savage
Active member
that hot rocks give a positive signal and cold rocks the null boing. Balancing slightly to the hot ones softens the signal so you can tell them from a metal target. Have I had it wrong all this time?
Hot clods and open holes deserve a forum all their own....somewhere.
Tom
Hot clods and open holes deserve a forum all their own....somewhere.
Tom
Jim McCulloch
New member
Tom and Ralph have it right, good 'ol Monte just got the nomencalture backwards.
Ralph Bryant
New member
"Nomencalture" ????? You're killing me !.........
Thanks for your help i have been doing a lot of reading and talking with the dealer that sold the mxt to me, I now understand better what my mxt is doing and i am the thing that needs to be trained. Got the book zip zip and have been reading it. Nothing to do cause it is poring rain.
Coolguy
Coolguy
Jim McCulloch
New member
.... reckon I gota due sum spel chekin' afore I psot. 
Thanks for catching that, Ralph, all that fancy schooling for nothing! Now that CW relic hunting season in on, hope you do well. HH jim
Thanks for catching that, Ralph, all that fancy schooling for nothing! Now that CW relic hunting season in on, hope you do well. HH jimRalph Bryant
New member
How'd ya do on them Mojave Midgets this past year ? Still accumulating ?
Ralph
Ralph
First comment: We can all have an 'off day' and maybe I had one.
Second comment: Frequently we hear about 'Hot Rocks' but very seldom do we hear about 'Cold Rocks' and I believe the reasion is because it is easier to associate with any rock that is out of whack with the surrounding ground to be called a 'hot rock'. Sort of a popularity thing and it won out because it sounded cool.
Third comment: We also hear people talk about hunting over 'hot ground' because it is more mineralized than where they have been hunting. Sort of like moving from a woodchip filled playground out onto the dirt ball field. You could have your GB set quite low in the woodchips and not know it, and then when you located around home plate the greater mineralization would become a challenge.
Is it 'hot ground' because it's more mineralized? It's just more mineralized than what the GB is set for.
Fourth comment: Several years ago I ws in a large prospecting & detecting shop to do a seminar. A fellow was there from Australia who had a couple of rocks with him. He referred to one as a 'hot rock' and one as a 'cold rock' or 'cold stone'. I asked him why he called them that and what detector and mode he was using. This was for everyone's benefit.
He mentioned the make and model and stated that he hunting in All Metal because he was a nugget hunter. The 'Hot Rock' would null out because it was some severe iron-intense mineral, and the 'Cold Rock' would produce a 'beep' when swept over.
I demonstrated how BOTH could be balanced to and not respond, or how a GB setting could be 'off', too high or too low, and they would either beep or null. The fact was, in the locations where he was hunting, and with the Ground Balance setting he had adjusted, one rock (or stone if you will) responded one way and the other responded the opposite way simply because they were a sample of an intense mineral body that was out of context with the surrounding matrix which he had adjusted for.
As I recall at the time, too, the excellent Tesoro Diablo
Second comment: Frequently we hear about 'Hot Rocks' but very seldom do we hear about 'Cold Rocks' and I believe the reasion is because it is easier to associate with any rock that is out of whack with the surrounding ground to be called a 'hot rock'. Sort of a popularity thing and it won out because it sounded cool.
Third comment: We also hear people talk about hunting over 'hot ground' because it is more mineralized than where they have been hunting. Sort of like moving from a woodchip filled playground out onto the dirt ball field. You could have your GB set quite low in the woodchips and not know it, and then when you located around home plate the greater mineralization would become a challenge.
Is it 'hot ground' because it's more mineralized? It's just more mineralized than what the GB is set for.
Fourth comment: Several years ago I ws in a large prospecting & detecting shop to do a seminar. A fellow was there from Australia who had a couple of rocks with him. He referred to one as a 'hot rock' and one as a 'cold rock' or 'cold stone'. I asked him why he called them that and what detector and mode he was using. This was for everyone's benefit.
He mentioned the make and model and stated that he hunting in All Metal because he was a nugget hunter. The 'Hot Rock' would null out because it was some severe iron-intense mineral, and the 'Cold Rock' would produce a 'beep' when swept over.
I demonstrated how BOTH could be balanced to and not respond, or how a GB setting could be 'off', too high or too low, and they would either beep or null. The fact was, in the locations where he was hunting, and with the Ground Balance setting he had adjusted, one rock (or stone if you will) responded one way and the other responded the opposite way simply because they were a sample of an intense mineral body that was out of context with the surrounding matrix which he had adjusted for.
As I recall at the time, too, the excellent Tesoro Diablo
Jim McCulloch
New member
... but not enough Mojave Monsters. But the Midgets DO add up. Bought another rental house.... HH jim
HH jim
A
Anonymous
Guest
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