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Showing content with the highest reputation on 01/11/2014 in all areas

  1. Hi Steve, Can you post the link to the mention on the other forum? I do not care if other forums get linked, mentioned, or talked about here. I am not able to find such a coil being made for the Gold Bug Pro or Teknetics G2 (same detector). I fact I can't even find a 14" x 12" Excelerator coil for anything. There is a 15" x 12" but not for the GPB. Kellyco is the Excelerator dealer at http://www.kellycodetectors.com/excelerator/EXcelleratorMain.htm Love the depth diagrams there - what a joke! As a general rule do not expect depths on coin size targets with a VLF to much exceed the narrowest diameter of the coil. On coils over 12" the depth gains are minimal and wil actually go backwards in bad ground. I do know when I put a heavy coil on a very light detector I end up not liking it. Weight is a big factor. I got the 15" DD Fisher coil for my F75 and hated it. Used it exactly once and sold it. Totally ruined the balance and feel of the detector. I do have a white 13" Detech Ultimate DD that I got for my F75 that is exceptionally light. I found out my F75 coils seem to work on my Gold Bug Pro although they are not an exact match for it. That coil seemed to give me a magic extra 1/2" on larger nuggets on my F75 but it may have been psychological. Anyway, I mention this as the 15" x 12" Excelerator coil for the F75 may work on the Gold Bug Pro. I have heard a lot of good things about the 12" x 10" Excelerator of other detectors, 15" not so much. The biggest "big" coil that I have and trust 100% for my Gold Bug Pro is the black 11" elliptical DD. Be aware a VLF is not a PI and going bigger coils does not always give you more depth. In bad ground a big coil sees more ground and so the gain may have to be backed off to compensate, pretty much leaving you where you started. In extreme ground you will get less depth with a big coil on a VLF! If you want more ground coverage with a big VLF coil they will do that but do not expect much in the extra depth department. If you want that, break out your Minelab.
    1 point
  2. Commercially, rock crushing is done in multiple steps. You should consider the same type of set up. My suggestion is that you consider a small jaw or cone crusher that will take 4 inch minus and take it down to 1/2 minus, then take the 1/2 minus and use your existing crusher to go down to minus 100. A big commercial mine would probably use a jaw to go from 24" minus to around 3 inches, a cone to go from 3 to about 1/2 and a ball mill to go from 1/2 to whatever the goal is - 100 mesh or whatever.
    1 point
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