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Date Posted: 17:36:25 08/29/02 Thu
Author: Jim McCulloch
Subject: Re: Vein Shooting
In reply to: Wishbone 's message, "Vein Shooting" on 13:04:47 08/29/02 Thu

Deep detecting of ore veins, visible or suspected, requires the ability to detect as deeply as possible, but without the detector's cancelling out the faint, broad signal of deep gold with either 1) fast SAT or 2) automatic ground balancing. Use as large a searchcoil as is feasible, for maximum depth, and then use MANUAL (or locked) ground balance with as little SAT as possible. Tune to the vein structure, and hunt ALONG the ore vein, DON'T go from vein to "country rock" to vein, etc. What one is looking for is any SLIGHT rise in the threshold sound from the vein itself. If a signal occurs, do preliminary testing to insure that you haven't run into a hot rock, non-auriferous semi-metallic deposit, such as iron magnetite, or galena, etc. You do this preliminary testing by 1) eyeballing the site, and 2) by removing some of the material from off of the target site. If the signal is stronger with the removal of some top material, that IS a good sign. If the signal gets progressively stronger as you go progressively deeper, this, too, is a good sign. Once, while "vein hunting," I got a real ear-bashing on a vein that had produced some serious AU not far away. Little Jimmy was sure he was back in "tall cotton" once more! Nope; some old miner had broken off the tip of his pick in this portion of the vein; I can tell ya', a Goldmaster gives a monster signal on 5 ounces of iron an inch deep! Oughta be a law this kind of thing! My adrenal glands got a work out that day! Back onto a more serious note: when hunting eluvial (hillside) placers, from which AU might be "shedding," when you find nuggets, or better yet, auriferous quartz ore, mark the spot, and carefully "eyeball" the hillsdie imediately above the find site. By "above" I mean in terms of hillside gradient. Then, detect in a tight "zig zag" pattern uphill. If you find any more of the Most Happy Yellow Metal, flag the spot(s), and mentally line up the find sites. If they run in a line, up and down the hill, now you are really onto something. (In which case STOP, and telephone me; I will help you clean out the site (grin)) You then need to thoroughly work that area, gridding it, if possible, for maximum efficiency. One spot, discovered by a friend, which ran about 70" long, and a maximum of 25" wide, produced 106 ozs., the two biggest pieces totalling 15 oz. At WWW.GOLDHUNTER.COM is my article "Half Pound Ravine." Actually, 79 oz. came from that spot. Although most of that has been sold, that is one of the reasons why Hawkeye and I have the largest safe deposit box at our bank. (NEVER keep any AU at home!) Hope this helps; for this info I am entitled to a 10% finders fee, right? HH Jim

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