IdahoJim

Members
  • Content count

    8
  • Joined

  • Last visited

  1. I took his question as how much material ended up in the hutch as a ratio to how much material went into the jig. As you said, unless we know exactly which ratio he was after, there's no way to answer the question. Jim
  2. LOL....shouldn't have encouraged you.....ha! Jim.
  3. Thanks for the kind words, Ron. The table has been a JOB...LOL. I made one significant change since I posted that video....I lowered the slope of the riffles. That lowered the upslope of the table, and gave me MUCH more separation of the tungsten from the black sand. You can see the changes, and results, here:http://www.youtube.com/watch?v=pNlCFUd6c-M Still have a few minor mods, but it's mostly done. I hadn't planned on selling plans for the table, but have had some requests, so will get busy on drawing it up, and getting some build pics done.....it's snowing here, so nothing else to do. Jim
  4. I built this table a couple of years ago. Been fiddling with it off and on, Finally decided to get it done. The drive unit was the trouble spot, but I got that solved this week. Now that it's done I noticed a problem I didn't know I had. The riffle taper is too steep. They are about 1/4" high at the feed end, and they should have been 1/8". The table slopes up from right to left, so the riffles are level, and the water flows across them. You can't lower the slope of the table, because the water would then flow along the riffles, which would force all the material to the con end....bad. Other than that, the table seems to work well. The video is here: www.youtube.com/watch?v=ffaxWOwWxJs Any suggestions, questions, etc....welcome! Jim
  5. I'll do that...many thanks. Jim
  6. Thanks,guys. I think my first approach is to crush the large remainder piece....the one in the pics I'm going to save. I'd like to see if there are garnets, or chrome diopside. I'm interested in gems, not metals. Then, I'm going to spend a few days down there looking at anthills, and checking the drywashes in the area....just a general prospect. I'd like to locate the source. I doubt the rock was thrown-out, but may have been hauled in from a gravel pit, though that material is usually crushed, and screened to a much smaller size. The area is along the western edge of the craton that underlies Wyoming, and northern Colorado, so it's a possible spot for a lamproite, or kimberlite. But, it;'s a big lavafield, too, so it could just be rhyolite tuff, though it stood out like a cherry in jar of mayonaise. Jim
  7. Thanks, Eric....really interesting. Amazing that anybody would recognize some of those really rare items. I sure wouldn't. Jim
  8. I found an interesting rock while driving some back roads in northern Nevada a couple of weeks ago. It was lying next to the two-track, and I noticed it because it had a greenish tint. The country rock there is either rhyolite, or basalt, and dark in color. This rock is definitely an anomaly. It may be a lamproite tuff, or maybe it's simply a form of rhyolite. It is scratchable with a knife blade, but not easily. A couple of drops of muriatic acid had little noticable effect. The main rock was about 10" across. The piece in the pics is about 3" x 3" x 5". If anybody can help, I'd be grateful. Jim