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A good start

May 13, 2019 09:05PM avatar
I agree that the nail board test is one of an almost infinite number of different combinations and scenarios. However, if a person is going to go out and try to tackle these kinds of sites ( Ghost Towns etc filled with iron) the nail board is a good starting point. If you can get a machine that passes 8 for 8 with a IH or Zinc penny, or better yet one that can hit a dime or half-dime 8 for 8 on this test, then you have given yourself an edge over a machine that can only hit 4,5, or 6 of 8.

Also, the times I have used it to show someone else, I tell them to stare only at the coil while doing the test. Each time they get a good high or mid tone etc ( or just a good single tone) I ask if they would dig that target and they say yes. Then we do the test again and ( provided the machine has VDI numbers) I ask them to run it again and this time only look at the VDI numbers.....same question, would you dig the target? Now they hesitate, even though they know its a good target ( they can see it) they still want to say no on a majority of the sweeps. The VDI numbers are not "conveying" the right info. So it's easy to show them masking and why not to rely on VDI numbers when out tackling those kinds of sites. Pay attention to the tones and skip the VDI numbers.

Lastly, I can use the nail board test as a baseline in that the test never changes. Same nails and coin. I can compare machines today and five years from now test future machines on the exact same test and have a good comparison.

It's amazing that sometimes it does not take much to mask a coin or good target. Monte placed a 50 cent piece on the ground and placed a paperclip about 1 inch over it. At the time I had the M6. I swept over it, No problem getting the coin. He spread the paper clip open and spread it out to cover most the coin, still hit it no problem, then he did one simple thing to the paperclip and I could not detect the coin. Can ya guess what he did?

Another good example is when we had the IH Penny in the plastic holder that Rich finally found when he was up here a few weeks back. The first time I kept Rich occupied with some chit-chat and Zincoln hurriedly placed it on the ground and covered it just enough to not see it.

Sure enough about 15 mins later Rich worked that area and went right over it. Zincoln & I were standing 20 or so feet away. But Rich kept right on hunting. I looked at Zincoln and asked," How the hell did he miss that, he was right on top of it." So when Rich got a little ways away we went to retrieve the coin and try again. I swept my Racer 2 around and oops!! I couldn't find the coin. I was expecting a good solid beep. Zincoln tried and got the same results. He finally got barely a very crappy signal now that we were looking for one. So that randomly placed penny was just about completely being masked by the stuff under it and 3 different machines could not get even close to a good signal on it and that was on the surface.

I'm convinced today that for every coin that is found at these old sites, probably a handful more are still there and masked by trash. I still think lots of coins exist at these sites, but the ones that can be detected are getting far more scarce.

Also that's a pretty hefty task, going in and getting out some of the trash and it will only be the surface trash. Sometimes ya clean out a little area and get lucky like we did with the motel FOB and sheep ear tag a few years ago or you can spend all day trying to clean an area and get zip because the coin is still being masked by trash under it, or a coin simply never got lost in the spot you picked to clean out.

I wish ya luck and will be fun to see what results you get.

It would be fun to own an old ghost town, say Toano for example. and use a front end loader and shave off the first 6 inches of soil and run it thru a bg screener. Might be amazed at what good targets still exist.

Subject Author Views Posted

Real world masking Attachments

glabelle 390 May 12, 2019 09:18PM

A good start

OregonGregg 220 May 13, 2019 09:05PM

Re: A good start

Kickindirt 213 May 13, 2019 10:20PM

Re: A good start

glabelle 202 May 14, 2019 07:16AM

My shirt pocket metal detector ... and that was the lightweight part.

Monte 217 May 14, 2019 10:55AM

Re: Real world masking

zincoln 216 May 13, 2019 07:10PM

Re: Real world masking

glabelle 204 May 13, 2019 07:16PM

Typical ghost town mask Attachments

glabelle 230 May 13, 2019 07:09PM

The Phantom of the ghost town is unmasked. cool smiley

UtahRich 214 May 14, 2019 06:48AM

Re: The Phantom of the ghost town is unmasked. cool smiley

Rdunzl 228 May 14, 2019 08:18AM

rin tin tin

UtahRich 173 May 13, 2019 11:37PM

Re: Real world masking

NWCindy 248 May 13, 2019 06:09PM

Masking . . . the odor.

UtahRich 192 May 13, 2019 11:43PM

Re: Masking . . . the odor.

NWCindy 200 May 14, 2019 06:16PM

Re: Real world masking

D&P-OR 209 May 13, 2019 06:20PM

Re: Real world masking

NWCindy 243 May 13, 2019 07:54PM

Re: Real world masking hope your broom is as strong as the magnets. Some big iron in those old sites. N/T

Kickindirt 216 May 13, 2019 02:14PM

How strong is that Magnet?

UtahRich 204 May 13, 2019 03:37PM

Re: How strong is that Magnet?

Kickindirt 200 May 13, 2019 05:16PM

The Magnets

glabelle 204 May 13, 2019 06:59PM

Re: Real world masking

UtahRich 197 May 13, 2019 02:02PM

There are so many variables, we have to recognize that there is no 'perfect' in "The Real World."

Monte 236 May 13, 2019 01:00PM

Re: Real world masking

Kickindirt 211 May 13, 2019 09:22AM

Re: Real world masking

Elbert 211 May 13, 2019 08:28AM

Re: Real world masking

glabelle 208 May 13, 2019 10:59AM

Will be interesting to watch.

OregonGregg 213 May 13, 2019 05:57AM

Indian Head?

glabelle 208 May 13, 2019 07:11PM

Re: Indian Head?

OregonGregg 205 May 13, 2019 07:59PM

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