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Date Posted: 19:21:37 07/07/02 Sun
Author: jim straight
Subject: Re: Sure, you can balance the machine to the rock---
In reply to: Ralph 's message, "Sure, you can balance the machine to the rock........ BUT" on 16:40:23 07/07/02 Sun

It seems that in these discussions that a hot-rock, whatever it is called, "positive or negative," a "'hot-rock' or a 'cold stone,'" etc., if held in the air can be "ground balanced" to neutral?

Simplemindedly: Is part of the definiton of a hot rock (+ or -), is that it is a concentration of ferrous or ferric oxide having a different "neutral" (magnetic loss angle) balance point than the ground matrix found under the swinging coil?

What about pyrrotite?, a iron-sulphide, it is reactive to a neutrally ground balanced VLF-type gold machine. Would a piece of graphic-schist be considered a hot rock.

Another thought; is it wise to balance slightly positive or negative? Ralph slightly touched on this by his comment of the success some are/were having in finding the small specs by off ground-balancing.

Does off-setting + or - hinder the chances of finding a larger-deeper nugget? Is a detector, especially one operating the "LF-range" of 30 kHz, now being operated at max. effectivness?

Anyway, several hundred small specks take time to dig. They are only worth about 70% of spot. As an "example;" Is it best to end a years detecting with several hundred--- actual count 732 small gold flakes weighing 832 grains, or to take three years of detecting to recover 58 nuggets totaling 1216 grains?

Remember, in this small-speck area, such as mentioned by Ralph, many "bigger-nuggets, going over an ounce or more, such as T-Bone's 27 ounce or the 42-ounce "Fan tail," have also been found.

Thus, today, with a gold-machine that has been designed specifically for accurate spot-on neutral ground-balance, is it wise to gb + or -? However, notice, in one earlier post someone mentioned a specific AGB and tracking machine, and casually noted it tended to gb slightly negative. Is it possible that the design engineer may have built this offset deliberately?

Also, another comment, not all AGB's can be operated in "Fix." While with another AGB, some recommend after gb'ing, to use "fix."

I will say that all posts regarding any of the comments have been, and will continue, to be right. There are too many variables involved. It is like the proverbial story of a blind man trying to describe an eliphant.

This is how we learn!

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