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How does the new GB perform around Hot Rocks, Red Bricks, and Coke/ Coal slag? Does it false "high" on these? :shrug:
- Thread starter Adam(Va)
- Start date
Depends on what you mean by "falsing high" and where you have the discrimination set. As with other metal detectors, even with discrimination set to knock out foil, there's some coke out there that still may hit in the coins region. With a little practice you can learn to not dig it since it doesn't have the crisp clean response that a coin has. ........ If you're thinking of "wraparound", the Gold Bug exhibits less "wraparound" than most other metal detectors but you'll still get it now and then.
--Dave J.
--Dave J.
From the California gold fields as well as some coke samples I have had for years as well as some fired bricks I have dug out of some of my colonial Water sites where one dollar gold coins have been found as well as other Gold coins.........with the unit set proper it saw thru all the rocks that was giving my prospector friend A problem......not only did you know it was a hot rock but you could put a nickel under 2 of the 3 and see tru the rock enough to know there was something else there......LIKE DIG ME..the third one would hit a nugget right next to it....(IMPRESSIVE)..
My fired bricks where not a problem and could see thru... but remember it will still average the 2 targets as one so do not expect it to read a full quarter at 84 it drops down to zinc or even pull tab ......but I will dig pultabs under 200 year old bricks all day long because it usually not a pull tab but a BUST coin....
Also the ground resolution is 0-999 .......This is a good range to play tricks on bad ground.....
Happy Trails
jimpugh
My fired bricks where not a problem and could see thru... but remember it will still average the 2 targets as one so do not expect it to read a full quarter at 84 it drops down to zinc or even pull tab ......but I will dig pultabs under 200 year old bricks all day long because it usually not a pull tab but a BUST coin....
Also the ground resolution is 0-999 .......This is a good range to play tricks on bad ground.....
Happy Trails
jimpugh
BuckeyeBrad
New member
after getting over a few of them and a bit of experimentation, they're not a problem to identify and avoid digging.
Dave, the description you gave was correct, I should have wrote, "Does it give a High VDI # and solid response to Fired Brick and Coke". Some of the areas I hunt are early coal mine camps (1700's). The soil in some areas I hunt is basically layer of Coke with iron mixed in it. The T2 and F75 will find stuff in it but you hear that constant "machine gun audio" while searching (I have the discrimination on the T2 @ 19-21 and the F75 @ 9-10 looking for small Brass/ pewter buttons and gold coins). They way Jim Pugh explained how the Gold Bug averaged the Targets to Lower VDI's is what I see a lot with the T2/ F75. The issues I have are the Low VDI targets I am looking for get averaged down even lower into Square nail range. The Minelab's BBS/ FBS machines have done well in these areas and even the TDI if you have it set correctly (Detectorguru showed me that 
). Detectors like the MXT and Xterra 705 gave that "sweet brass/ button response" to Coke which made for a lot of digging, so giving a "high" VDI response has been beneficial. I tended to ignore all those high VDI's and go for the ones in the middle and lower. I don't know if it would have been possible but I wish the Notch on the F75 could have went all the way to "Quarter +" to take a little load off the ears. The expanded iron range on the GoldBug and G2 look very promising for the type of hunting I do.
). Detectors like the MXT and Xterra 705 gave that "sweet brass/ button response" to Coke which made for a lot of digging, so giving a "high" VDI response has been beneficial. I tended to ignore all those high VDI's and go for the ones in the middle and lower. I don't know if it would have been possible but I wish the Notch on the F75 could have went all the way to "Quarter +" to take a little load off the ears. The expanded iron range on the GoldBug and G2 look very promising for the type of hunting I do.
azsh07
Member
I classify "true" hot rocks hematite magnetite and basalt. Now that is just my little idiosyncrasy....but it comes from prospecting in Arizona.
For these 3 types of rocks any and all detectors hit them like a good target. Now basalt is a volcanic rock and we don't see them out east but they hit good but they are broad and mushy sounding much like a big marshmallow.
The two iron stones hit like a silver half...usually hard and hi. However, while they hit like a silver half at 2" if you lift they coil 3" or so they will either disappear completely or be so soft it is obviously not a good target....as a good target would not die off that quickly.
Luckily we do not have the plethora of iron stone out here we had in Arizona. Even the PI's responded with solid hits to this group.
The iron stones will ground phase close to ferrite sometimes....now that is iron stone. While Basalt I think is more like an Alkali response.....I forget though.
The rest of the rocks that give a good hit are nowhere near is brutal. Around here it is generally forms of Granite that will get a response and I do get a few from the SE. However very few and only when they pocket is greatly different in ground phase then the current ground makeup.
As an example i hit a few spots like this yesterday. The ground phase of clean ground was 72....but the hot granite pockets were a ground phase of 88. These would hit but had such a retarded sound it was quite obviously not a target. Certainly not like an Explorer with a hi coin tone. Again all metal response is broad and the the disc hit disappears with just a few inches of the coil lifted.
Then there is the cold rocks which are negative compared to the ground and these will give a zip sound which again is so retarded sounding you wouldn't even bother to stop. I did check a few and they were cold rocks...the ground phase was in the low 40 range and here the all metal nulls out.
As for coal I don't have a lot to compare to...we have it but it is small and scattered and rarely an issue.
Now red brick is everywhere especially old cellar holes. I have not had a response from brick at all to this point. Not that I ran my coil over a pile of it but it is all over the place in broken pieces and all the chunks I ran over never bothered the machine.
So for hot rocks out here the SE has been better than almost any machine I have used. It will hit just now and again on some granite pockets and again not just granite stones but pockets and any machine will do that. To be honest though...it cruises so well through the granite here I have not had to stop and bother with it like other machines.
Brick was a non issue. Coal and clinkers I leave to others who deal with that on a more regular basis.
Remember since this is a gold machine this issue would have been factored in. Also they knew the first Cabelas versions had some trouble with the "true" hotrocks as I made them aware of it. Since then they made changes that reduced even those responses.
For these 3 types of rocks any and all detectors hit them like a good target. Now basalt is a volcanic rock and we don't see them out east but they hit good but they are broad and mushy sounding much like a big marshmallow.
The two iron stones hit like a silver half...usually hard and hi. However, while they hit like a silver half at 2" if you lift they coil 3" or so they will either disappear completely or be so soft it is obviously not a good target....as a good target would not die off that quickly.
Luckily we do not have the plethora of iron stone out here we had in Arizona. Even the PI's responded with solid hits to this group.
The iron stones will ground phase close to ferrite sometimes....now that is iron stone. While Basalt I think is more like an Alkali response.....I forget though.
The rest of the rocks that give a good hit are nowhere near is brutal. Around here it is generally forms of Granite that will get a response and I do get a few from the SE. However very few and only when they pocket is greatly different in ground phase then the current ground makeup.
As an example i hit a few spots like this yesterday. The ground phase of clean ground was 72....but the hot granite pockets were a ground phase of 88. These would hit but had such a retarded sound it was quite obviously not a target. Certainly not like an Explorer with a hi coin tone. Again all metal response is broad and the the disc hit disappears with just a few inches of the coil lifted.
Then there is the cold rocks which are negative compared to the ground and these will give a zip sound which again is so retarded sounding you wouldn't even bother to stop. I did check a few and they were cold rocks...the ground phase was in the low 40 range and here the all metal nulls out.
As for coal I don't have a lot to compare to...we have it but it is small and scattered and rarely an issue.
Now red brick is everywhere especially old cellar holes. I have not had a response from brick at all to this point. Not that I ran my coil over a pile of it but it is all over the place in broken pieces and all the chunks I ran over never bothered the machine.
So for hot rocks out here the SE has been better than almost any machine I have used. It will hit just now and again on some granite pockets and again not just granite stones but pockets and any machine will do that. To be honest though...it cruises so well through the granite here I have not had to stop and bother with it like other machines.
Brick was a non issue. Coal and clinkers I leave to others who deal with that on a more regular basis.
Remember since this is a gold machine this issue would have been factored in. Also they knew the first Cabelas versions had some trouble with the "true" hotrocks as I made them aware of it. Since then they made changes that reduced even those responses.