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Question
- Thread starter jst2kool
- Start date
TerraDigger
New member
Directly from the Teknetics T2 manual. Hope it helps.
HOT ROCKS
A hot rock is a rock which causes the metal detector to sound off because the rock contains
iron minerals. They come in two basic types.
Negative hot rocks (also called cold rocks) are usually magnetite or contain magnetite,
and give a negative response because their ground cancellation phase is a higher
number than the soil they are found in. They tend to be dark in color, usually black, and
usually heavy. In some cases they will have rust stains. They are usually attracted to a
magnet, and for this reason gold prospectors always carry a magnet
HOT ROCKS
A hot rock is a rock which causes the metal detector to sound off because the rock contains
iron minerals. They come in two basic types.
Negative hot rocks (also called cold rocks) are usually magnetite or contain magnetite,
and give a negative response because their ground cancellation phase is a higher
number than the soil they are found in. They tend to be dark in color, usually black, and
usually heavy. In some cases they will have rust stains. They are usually attracted to a
magnet, and for this reason gold prospectors always carry a magnet
Larry (IL)
Well-known member
That is a good explanation for hot rocks but ground phase is not the same as ground balance. TMI for some but I thought it might be interesting reading for others.
The ground phase is measured in degrees from 0 to 180 with pure ferrite being very close to 180 degrees, -95 in a White's VDI scale and a pure conductor will read close to 0 degrees, or +95 VDI. Salt water or a wet fertilized field come in close to 90 degrees or 0 VDI on the White's scale. The scale used to represent the phase of the ground may vary from manufacture to manufacture.
Ground balance is setting the detector to ignore the ground phase so that it does not see the ground as a target. Years ago Ground Balance was known as the Ground Exclusion Balance (GEB)
The ground phase is measured in degrees from 0 to 180 with pure ferrite being very close to 180 degrees, -95 in a White's VDI scale and a pure conductor will read close to 0 degrees, or +95 VDI. Salt water or a wet fertilized field come in close to 90 degrees or 0 VDI on the White's scale. The scale used to represent the phase of the ground may vary from manufacture to manufacture.
Ground balance is setting the detector to ignore the ground phase so that it does not see the ground as a target. Years ago Ground Balance was known as the Ground Exclusion Balance (GEB)
TerraDigger
New member
Larry & Terra will be issuing jst2kool his hot rock diploma next week
GoGoGopher
New member
I fell asleep...can I Borrow your notes???...lol...
We have a lot of old coal in the ground up my way...From old house sites, and also from rail cars and dumped off delivery trucks I imagine, but it can drive ya nuts, especially on hot days...I guess that is why they call em "HOT" rocks...They do not seem to sound off when it is cold out...dumped charcoal can also ring out if it is REAL wood charcoal, and been there for a while...I was perplexed the first time I dug up charred wood...I kept checking the hole, then the charred wood, but it would not sound off once it was out of the ground...I figured it HAD to be the charcoal, as nothing else was found in the hole...
HH,
We have a lot of old coal in the ground up my way...From old house sites, and also from rail cars and dumped off delivery trucks I imagine, but it can drive ya nuts, especially on hot days...I guess that is why they call em "HOT" rocks...They do not seem to sound off when it is cold out...dumped charcoal can also ring out if it is REAL wood charcoal, and been there for a while...I was perplexed the first time I dug up charred wood...I kept checking the hole, then the charred wood, but it would not sound off once it was out of the ground...I figured it HAD to be the charcoal, as nothing else was found in the hole...
HH,