what are hot rocks

[pchop]

i was just outside in my garden and dug up a rock that look like a piece of coal, will the detectors hit on coal? i live in new jersey (south) and my house is over a 100yrs old but lots of buried trash, guess they did that back then. i know maybe they burned coal back then to. i dug up alot of copper, old clocks, old lawnmower parts, but no coins. my grandfather tells me the people that lived here years ago were broke lol. thanks for the replies guy`s.


keith

 

[steve herschbach]

Hi,

A hot rock is any rock like object that is differs enough from the surrounding soil and therefore ground balance setting that it generates a signal from your detector.

Your detector has a ground balance setting that is adjusted to not signal on a given ground response. So let's pretend your ground balance setting can go from one to ten. And you find you have to set it to 4 to keep the ground from signaling. Many machines like the Vision do this automatically.

Now here comes a rock, or a lump of coal, that differs in mineralization and would take a ground balance setting of 7 to tune out.You only get one ground balance setting, and since you are set at 4 for the normal ground this item that reads 7 is detected.

Many turf hunters rarely encounter hot rocks. They are a fact of life for nugget hunters.

Steve Herschbach

 

[pchop]

thanks steve for the great explanation, appreciate it

keith

 

[Tony]

...and then take that hotrock that reads "7" and drop it amongst soil that reads "7"...and hey presto.....no more hot rock....

Tony.