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Randy Lunn

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Posts posted by Randy Lunn

    Why Is Gold A Low Conductor And Silver A High Conductor When

    in Metal Detector Advice & Comparisons

    Posted

    The smooth flow of electrons in a metal is the key to high conductivity. In bulk metals the electron shells of individual atoms morph into electron bands. The outer sp bands in copper, silver and gold all conduct well, but can be effected by the next inner d band that can cause scattering (i.e. lower conductivity). “This is least important in silver where the 4d-electrons are about 4 eV away from the Fermi-level (which is also why silver is colorless). But the 3dbands in copper and the 5dbands in gold are closer to the Fermi level (absorption in the blue) and they cause more scattering with the sp electrons.” Silver wins.

    Ingredients For Life Revealed In Meteorites That Fell To Earth

    in Metal Detecting For Meteorites

    Posted

    Study, based in part at Berkeley Lab, suggests dwarf planet, Ceres, in asteroid belt may be a source of rich organic matter

    Two meteorites that separately crashed to Earth in 1998 after circulating in our solar system’s asteroid belt for billions of years share something else in common: the ingredients for life. They are the first meteorites found to contain both liquid water and a mix of complex organic compounds such as hydrocarbons and amino acids.

    https://newscenter.lbl.gov/2018/01/10/organic-meteorites/

    image.thumb.png.bc060180619f27341e9b45f33c43990e.png

    Ceres, a dwarf planet in the asteroid belt pictured here in this false-color image, may be the source of organic matter found in two meteorites that crashed to Earth in 1998. (Credit: NASA)

    What Was The First " Smart " Detector?

    in Metal Detector Advice & Comparisons

    Posted

    For me the first smart detector was the Gold Bug 2. This machine understood (and still understands) my meager skills and allows me to find gold. Its basic discrimination is straight forward, consistent and can give target insights. It is a great companion machine for my GPZ, and I can not imagine going into a gold field without it. It has withstood the test of time and aged gracefully.

     

    Who Is The Manufacturer Of The Red Tipped Hook And Spoon Crevice Tool?

    in Gold Panning, Sluicing, Dredging, Drywashing, Etc

    Diablo Pass V. 2.0

    in Metal Detecting For Meteorites

    Posted

    Hi Lunk,
    I am still learning a lot as I add to my meteorite collection. You have really tuned your eyes (and ears) to see these highly weathered L6 meteorites. Thanks for setting a high standard for the rest of us.

    Randy

    L6 - "type 6: Designates chondrites that have been metamorphosed under conditions sufficient to homogenize all mineral compositions, convert all low-Ca pyroxene to orthopyroxene, coarsen secondary phases such as feldspar to sizes ≥50 µm, and obliterate many chondrule outlines; no melting has occurred."

    Ben Nicoloson Using His New Gold Monster For The First Time

    in Minelab Metal Detectors

    Posted

    Besides being painful to watch the poor technique and lack of plastic shovel, this video also shows a bit of the Gold Monster's weakness (or rather individuality). When on a target you do not get the strong zip-zip-zip of a GB2. The signal is less crisp and becomes occasionally intermittent as the ground balance begins to cancel out the signal. Excessive swings back and forth over the target is not recommended. You need to regularly take the GM to the side and pump it to re-ground balance.

     

    The GM is a great machine but it's "best practices" are slightly different from other machines. 

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