Discriminating Hot Rocks

[stevewilko]

Howdy,

Blackwood, Albion has a few small patches of very dark ground, showing burnt blacks and reds on the surface.

I have found that detecting over hot ground as regards the attending non descript signal sound often generated I did the following-;

I scraped the top clean and again detected over the signal site after ground balancing away on the side.
I had the same non descript sound generated, so I followed through on the swing and when I came back across I held the coil hard over it for 5 seconds and then moved away.

After 5 seconds I went over the signal site and had a definite change in signal to that of a definite target. Just like it should sound.

10 seconds later with another pass the signal had fallen away to what it was at first pass.

Yep, it was small hot rocks.

Is it possible to be 'energising' hot rock and mineralisation with a detector?

Is this a valid 'energising of hot rocks' as a discrimination tool ?

Cheers All....

 

[Guest]

I would guess it is the automatic threshold/GB of the machine working properly (SETA on ML's?). And, yes, scraping/evening out the surface will help. Plus the old adage-low and slow.
Just and poor and ignorant bums wild guess.( The only ML I can afford is an XT17000). 8.(

 

[Westaus]

Also make sure you crack open these hot rocks, gold has been found in them as well?

 

[stevewilko]

Thanks Gentlemen
Appreciate your input.
Gives me a wider perspective on the 'must dig everything' approach.
I have cracked open one or two hot rocks out of curiosity.
Therefore - will continue to do so...

Happy New Year Cheers..

 

[Wishfull]

Dig everything. ....if you get a signal however faint or doubtful dig it up. It's like a bix of chocolates. ..you never know what your gunna get.

 

[HeadsUp]

i have to admit i am not very good in the discrimination game , it drives me up the wall enough that i discriminate with a hammer or pick and crack the **** in half.

if there are rings of rusty ironstone inside then the rock stays where it is in the bush impersonating a paperweight , crushing a few of them over the years yielded zip but one day there will be some with nuggies inside , more ZING in the signal gives that away hopefully.

I have had pale cream / white coloured rocks before that appear volcanic in origin , they show none of the typical brown / black ironstone rings that i usually blame for noise , i have even crushed and panned some with no gold found so i am guessing it is other magnetic elements conspiring to annoy me for entertainment , cant blame them really , it must get quite boring in the bush just sitting there waiting for the natural elements to convert you into dust.

 

[Ridge Runner]

If you are talking about discriminating hot rocks with a VLF all you need to do is ground balance them out and then adjust the disc to make them vanish almost completely, once you do that they won't signal if they are deeper than 2+/- inches from the Coil and they normally only sound off after the Coil has gone past them, where a target starts to signal as the Coil starts to approach the target, Ground balancing them out will work in most cases,

Vlf's hate Basalt and have a real hard time with them, With a VLF you can balance out most hot rocks and burnt ground etc,

John.

 

[user 4386]

Also make sure you crack open these hot rocks, gold has been found in them as well?

Iron rich (often brown and red) rocks are a major CAUSE of gold being there in some areas - some large mines have entirely mined their gold from such rocks (a type of ancient soil) for years - eg in WA especially (eg early days of Boddington - they produced bauxite, an ore of aluminium as a by-product (it is also a soil). The variety is called ferricrete or iron-rich laterite.