Magnetic Mineralization Analysis???? Pressing GB button and Modes

[Kevin B.]

I saw something in the second chart of the sticky entitled :"Target response comparison of the three 15 9nch All Terrain coils" written by digger. I had over read this part but found it interesting. It is in the 4th line of text at top of post and says: "While still in GB mode, I pressed Pattern button to get a six digit number corresponding with magnetic levels present."
I then looked for this in the manual and the E-Book and couldn't find it, but possible have over looked it. I am going to try it in my soil today, here at the house in a part of the yard that is totally free of metal. Hopefully it will give me answers to why my Xterra 705 is giving me GB numbers that correspond with low mineralisatio. but my other units indicate the soil to be very mineralised.

 

[Old Longhair]

The ability to measure mineralization isn't published anywhere. It's only known to us because of BarnacleBill, so don't strain yourself looking for it in ink.

Bill's procedure can be read in it's entirety HERE.

 

[Kevin B.]

What I actually learned from his article, besides hitting the MODES button and getting those numbers, is that I have been Ground Balancing improperly. I just went outside and tried his method of: Sens at 20, let coil reats on the ground and start with auto-tracking. Raise coil to a height of two feet. By that time, my unit 'sounds off that its finished. I have three different readings.
1) GB of 36 (Instead of in the 60's) Mineralization numbers: 00-59-70
2) GB of 34 Mineralization numbers: 00-92-87
3) GB of 36 Mineralization numbers: 00-57-94
This was taken at three different spots in the yard. The place where I have the dimes buried was in our old Garden spot where the soil has been turned for years. I will dig them up today, as that test was messed up from the start.
PS: I hit all three bullets at my lowered Ground Balance number. Now, my only problem is this: When in Tracking Mode (with NO offset), the machine has been ground balancing in the lower to mid 40's. As opposed to the method I tried moments ago. Maybe I better stick with Barnacle Bill's method of Ground Balancing in my yard. All of this is very interesting. And I appreciate the link.

 

[Old Longhair]

The only thing that I would add, is that the reason for Sensitivity being set to 20 is one of standardization for the measurement. He also specifficly says that it is to be done with the stock 7.5kHz coil for his numbers to be relevant.

For comparative purposes it is worth noting what the measurement is with different coils, but the hard numbers are meaningless by themselves if his procedure isn't followed exactly. Your numbers have no baseline to compare to w/o doing it with a 7.5kHz coil.

That said, I've done some testing with different frequencies, GB, and mineralization measurements. As an example of how different frequencies interact with ground minerals, at one site I showed conductive mineralization of 00-24-25 with the stock 7.5kHz coil, 00-38-90 with a 3kHz coil, and 00-44-44 with a high frequency coil. Magnetic mineralization at the same site over the exact same ground showed 00-00-59 with the stock 7.5kHz, 00-00-74 with the 3kHz, and 00-03-25 with the 18.75 coils. Since my tests did not all use the same size and configuration coils, direct comparisons are hard to make to extrapolate a deffinative pattern. A larger coil will "see" more minerals, and a smaller one will "see" fewer, simply because of the volume of ground being scanned, just as a DD will show fewer minerals present than will a same size concentric.

 

[Kevin B.]

Oh, okay. I never thought of that, In fact, I haven'tthought of alot. I appreciate your feedback Longhair.