Re: Is More Information Needed?? (long text)
May 29, 1998 at 22:02:27
In Reply to: Re: Is More Information Needed??
posted by wayne from granger, wa. on May 29, 1998 at 14:08:59
I agree with Lanny and Wayne - there are a lot of factors involved, including the fact that you can get an "alteration halo" around the gold when it is buried in ground that allows you to detect it deeper than you could in an air test. The alteration halo can be more pronounced in different soil types.
This is no bull - I found a 17.5 gram nugget at a measured depth of 18" with the SD2100 8" coil. I'd been working fairly noisy ground on a flat for small bits, mostly ranging from a tenth of a gram to a half a gram with the occasional bigger piece up to 2 grams which were all pretty close to the surface. I then found a couple of pieces in a dry creek bed and wandered up onto the benches of the creek and got a signal that I thought was probably ground noise but after scraping a couple of inches off the signal didn't dissipate as it often does with ground mineralisation, so I dug down through loam into the wash. It wasn't until I got to about 9" that I was sure it was metal and not ground noise. I think the fact that I was so attuned to faint whispery signals from chasing the small bits at the time, moving the coil at only a snail's pace, prompted me to dig that signal in the first place.
On the other side of the coin, a friend and I were both working a patch in totally different soil conditions with SD2100s - him with the 18" coil and me with the double D 11" coil. He got a signal that he also thought may have been ground noise and called me over. I couldn't pick up the signal. We scraped off about 3 - 4" and it still didn't register with the 11" double D but by then it was very definite with the 18" coil. That nugget ended up being only 12" deep and weighed 38 grams - almost one and a quarter ounces.
Regards
Steve
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