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californiagold

Fors Plus Dental Trip

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Hello,

It is good friday unless you had to go to the dentist like me. My appointment wasn't till early afternoon,  so I had a couple hours to go walking up a canyon near the old channel workings. I seen pocket gold geology as soon as I made it up the canyon a short ways. there is areas out there where the old timers found a few pockets and once in a while you can still find a pocket. but apparently they didnt know I was coming with my detector 140 years later because they took all the good ones. I did find some scraps they forgot. 6 pieces in 3 small areas. 2.8 dwt before my dentist appointment. luckily at the dentist everything was good.  I took along the Fors plus as my bird dog to sniff out those golden birds. Fors plus did a good job and really does well in that kinda geology.  Happy Easter 

20160325_153607.jpg

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Looks like they left some good ones to me! Nice job.

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Nice buddy! You sure know what your doing!

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Way to go...you sure have been in the yellow for some time.....congrats!

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why is that one nugget all red? UR the man for sure...

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WTG! Good thing you didn't have any cavities to have to fill with the gold.?

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22 minutes ago, tvanwho said:

why is that one nugget all red? UR the man for sure...

I colored it Red to look a Easter egg. No it is some limonite and a little bit of quartz still attached.  Alot of pocket gold or reef gold sometimes still has some mineralization attached.  I keep a lookout for minerals like that to find pockety areas. 

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3 minutes ago, Lunk said:

WTG! Good thing you didn't have any cavities to have to fill with the gold.?

Somebody told me that most dentist dont use gold anymore. Im not sure. I have a couple porcelain ones. not as pretty. 

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always a good day when you find some gold under the coil

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Maybe you need to go to the dentist more often?

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    • By Steve Herschbach
      Snow on the ground so time for a little bench testing. Fisher F75 SE version 7.0A (2013) with 5" round DD coil, Nokta FORS Gold with 5" semi-round DD coil, and White's V3i with 4" x 6" DD coil.



      The table shows VDI numbers on some standard items. The little allen wrench is like a small nail - a ferrous item. The BIC ballpoint is my standard simulated small nugget. The ring is my 14K plain gold band, around 7 grams.

      The VDI range on the Nokta runs from 1 - 99 with 40 and under generally ferrous. The F75 runs from 1 - 99 with 15 and under generally ferrous. The White's V3i runs from -95 to +95 with negative numbers generally ferrous. I say generally because in all three cases gold can run well into the ferrous range. Like by 10 - 20 VDI numbers into it!

      A few big lessons. The Nokta FORS VDI 1 - 99 range is skewed with high conductors bunched on the high end of the scale with most of the scale devoted to ferrous and low conductive items. This is ideal for relic hunters and prospectors. Silver coin hunters however usually prefer the scale to devote more room on the high end to possibly get a better handle on what is silver and what is not.

      The ferrous range of the Nokta actually runs all the way down into the ferrous ground range itself which is why there are 40 numbers devoted to it. The ID Mask setting defaults to 10 and if set lower allows ground signals to sound off. Since non-ferrous starts at 40 and I arbitrarily end low conductors at zinc penny on the upper end you have 40 - 82 or a spread of 42 points for low conductors. This really is no more than an average spread due to the large ferrous range.

      What I was happy to see is the simulated nugget (BIC ballpoint) nailing at 44 as a non-ferrous target.

      Contrast this to the F75 1 - 99 range. There are only 15 points in the ferrous range with the extreme low end represented on the Nokta scale truncated roughly in the middle. However, this leaves 16 up to 62 at zinc penny for a low conductor spread of 46 or slightly better than that on the Nokta FORS and leaves room for a little better definition for high conductive coins also. There is a ten point VDI spread between a dime and a quarter versus only 3 points on the Nokta.

      What disturbs me on this particular F75 is that having tried multiple coils I am getting the same result on the simulated nugget test. It wants to nail at a solid 1 which is well under the ferrous 8 reading for the allen wrench. This is not shocking but it is not good either. I can get the ballpoint to break in at 16 occasionally but it should be there hard and solid, not rarely. I had Keith Southern test his updated F75 and it seems to do better. I need to test this again when and if I ever get an upgraded F75 but it does confirm my suspicion that at least some Fisher units are not properly aligned at this critical break point.

      The White's V3i slays both of them with White's standard spread of 190 VDI points with half that devoted to ground and ferrous. A full 95 points is devoted to non-ferrous, giving a nice spread across the whole range. The V3i is a three frequency unit and the 22.5 kHz frequency employed allows it to easily nail the ballpoint test with a solid VDI of 3. White's even allows the 22.5 kHz frequency to use a native VDI range that skews and expands the low conductive range that delivers a VDI of 10 on the ballpoint, a very nice cushion between it and a ferrous reading. you have from 1 all the way up to 55 for zinc penny slightly beating both the Nokta and F75 for VDI resolution on low conductors and still room left for very good definition in the high conductor range.

      These detectors can employ a dual tone mode that delivers a low tone on ferrous targets and a higher tone on non-ferrous targets. The break point on the Nokta and F75 is preset at the factory VDI breaks of 13 and 40. The V3i you can customize not only the VDI break point but the tones.

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      Things get more interesting in Nokta DI3 or F75 three tone options. The low tone break for ferrous is the same but a third higher tone is added. On the Nokta zinc pennies and higher or from 80 on up delivers the third high tone. On the F75 it breaks above zinc penny so those pennies fall into the middle tone low conductive range.

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      Of note is that the Nokta DI2 dual tone mode uses VCO audio, but the DI3 three tone option defaults to a more normal modulated audio. DI3 favors a faster sweep speed than DI2 which benefits from going slower. A generality would be that DI2 is more powerful but DI3 better behaved.

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      Hello
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