Jim Hemmingway
Hero Member
- Jan 26, 2008
- 788
- 1,615
- Detector(s) used
- F-75, Infinium LS, MXT, GoldBug2, TDI Pro, 1280X Aquanaut, Garrett ProPointer
- Primary Interest:
- Prospecting
Cooter & Thompy...Nugget Test Results
Chris....did the test today. Background info...ground balance at 84ish (scale 0-salt to 99-extreme, a reading of 75 upwards considered to be more magnetic susceptible conditions confirmed with a Fe3O4 reading of 0.1 to 0.3 expressed as % volume magnetite (a small magnet into loose soil for a few seconds, it comes up covered in iron "filings"). The soil had enough moisture in it to be "compactable", but not damp. Used max sensitivity in both the all-metal motion and in the JE disc mode, using the 7" by 11" DD coil (only coil I currently have).
The test nugget, maybe three or even four grains, measures about one-eighth by one-quarter inch in an oval shape.
Ground test results: (a) the all-metal motion mode gave a good solid signal at three inches, but the two-way signal was gone completely beyond three inches. (b) the JE disc mode gave a good solid repeatable coin type signal at three inches, but thats about it for depth. Quite a surprise, JE's strong signal.
Comment: In the JE mode, the nugget ID'd at a stable, repeatable 12 to 14 (iron disc range runs from 0 up to 15). The disc level could be run up just past "12" (small iron rejection) before the nugget was lost from detection at three inches; the sens decreased to "90" still gets a more modulated but repeatable signal.
Thompy: You may recall under the "metal detecting forum" that I had mentioned I would get back to you with some ground test results. Well, I finally cleared an area of roofing nails and got it done.
Jim.
Chris....did the test today. Background info...ground balance at 84ish (scale 0-salt to 99-extreme, a reading of 75 upwards considered to be more magnetic susceptible conditions confirmed with a Fe3O4 reading of 0.1 to 0.3 expressed as % volume magnetite (a small magnet into loose soil for a few seconds, it comes up covered in iron "filings"). The soil had enough moisture in it to be "compactable", but not damp. Used max sensitivity in both the all-metal motion and in the JE disc mode, using the 7" by 11" DD coil (only coil I currently have).
The test nugget, maybe three or even four grains, measures about one-eighth by one-quarter inch in an oval shape.
Ground test results: (a) the all-metal motion mode gave a good solid signal at three inches, but the two-way signal was gone completely beyond three inches. (b) the JE disc mode gave a good solid repeatable coin type signal at three inches, but thats about it for depth. Quite a surprise, JE's strong signal.
Comment: In the JE mode, the nugget ID'd at a stable, repeatable 12 to 14 (iron disc range runs from 0 up to 15). The disc level could be run up just past "12" (small iron rejection) before the nugget was lost from detection at three inches; the sens decreased to "90" still gets a more modulated but repeatable signal.
Thompy: You may recall under the "metal detecting forum" that I had mentioned I would get back to you with some ground test results. Well, I finally cleared an area of roofing nails and got it done.
Jim.
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