hawkeye Posted April 7, 2017 Share Posted April 7, 2017 Recently read Lucky's post about his Rye Patch adventure. Nice job guys and gal. He mentioned "we cover hundreds of acres with our coils a day". I'm pretty sure he didn't mean that literally, it just felt that way. Anyway, it got me wondering how much ground are we covering with our coil in day. For the sake of simplicity let's assume we are swinging a 12" coil in a 6' arc. Therefore we cover 6 sq. ft each swing. To cover an acre (43560 sq. ft) we need to make 43560/6=7260 swings. Also let's assume we are taking 3 sec./swing. Then 7260 swings x 3 sec/swing=21780 sec or 21780/3600sec/hr=6.05 hrs. So to put your coil over an acre of ground with a modest swing rate takes about 6 hours excluding any digging, eating, or whatever. You could cut that time by swinging faster or using a bigger coil, but covering an acre takes a fairly long time. You also could move faster and pass over ground between each swing, but your coil is still only seeing one acre. Food for thought. Damn, I got to get a hobby. 4 Link to comment Share on other sites More sharing options...
fredmason Posted April 7, 2017 Share Posted April 7, 2017 Hawkeye; no matter which coil or rate of swing the coil does see a lot of ground on the surface. Now you could compute how many cubic yards of matrix the coil processes...so many variables. No wonder there is always something missed. fred 1 Link to comment Share on other sites More sharing options...
klunker Posted April 7, 2017 Share Posted April 7, 2017 Now add 265 rocks to swing around, 49 large trees 152 small trees, one steep sided gully, 38% brush coverage, one hornets nest, a rattle snake.........My god, I would love to detect where I could make a 6' swing. Link to comment Share on other sites More sharing options...
Sourdough Scott Posted April 7, 2017 Share Posted April 7, 2017 It is not how fast you detect. It is how well, you detect fast. Buck brush, manzanita, sagebrush and fallen trees really slow me down. And big boulders and ????? 1 Link to comment Share on other sites More sharing options...
Steve Herschbach Posted April 7, 2017 Share Posted April 7, 2017 Except you have not really covered the acre. So let's go 50% overlap of the swings to get decent coverage at depth. 12.1 hours. And hit it from at least two different directions 24.2 hours. And you still missed a nugget or two! More food for thought. A one acre park in a city, detected for the last forty year by thousands of people with different detectors still gives up a silver coin now and then. One the flip side the first people on the first passes really do get the bulk of the targets. The easy stuff depletes fast. Then we spend decades eking out leftovers. 5 Link to comment Share on other sites More sharing options...
Popular Post LuckyLundy Posted April 7, 2017 Popular Post Share Posted April 7, 2017 I have a few Analytical friends, that are full of facts to share! I try to keep things as simple as I can...like weighing my gold in Penny Wieght (dwt) 20 to the ounce vs mind boggling 31.1 grams to the ounce! Now of course when we hunt for new ground, your hunting for one sitting Duck. Once that is found you hunker down with a slower coil swing in that area. Repeat process and GPS each spot with nuggets for future swinging. Now we park our vehicles and swing up to a half mile from parking spot and return swinging a different line. We move up to 3 times a day! So this last trip with 5 hunters at 3 miles a day swinging a coil, that's a ton of dirt. And with the desert soil being wet and hot, I know we walked right through a patch or two of nuggets we couldn't hear and found a couple of new spots for a later date revisit with better soil conditions. Sure we swing SDCs & GPZs, and they work magic in hot soils, but they aren't perfect! It's the hunt, that keeps my eye brow raised. Once I hear that perfect nugget tone, the hunt is over and I'm mining now, lol Rick 10 Link to comment Share on other sites More sharing options...
GB_Amateur Posted April 7, 2017 Share Posted April 7, 2017 36 minutes ago, Steve Herschbach said: A one acre park in a city, detected for the last forty year by thousands of people with different detectors still gives up a silver coin now and then. Another sort-of datapoint: Many coin/treasure (not nugget) hunting clubs have organized park hunts where they plant tokens/coins and redeem them for prizes. Although I've never been on one, I think they get a few hours to cover a few acres, and searched dozens of detectorists. By the end, there are still planted targets that haven't been returned. My sister's club used to plant valuable items but did away with that and now plant worthless tokens which are redeemed for the valuables -- that way the club at least doesn't 'waste' any good stuff. Link to comment Share on other sites More sharing options...
johnedoe Posted April 7, 2017 Share Posted April 7, 2017 You guys ae makin my head hurt....... Link to comment Share on other sites More sharing options...
Deft Tones Posted April 7, 2017 Share Posted April 7, 2017 And I've seen relic hunters in the US and overseas showing the finds that blow the mind and claiming to have covered several acres in a day. You'd have thought I was attacking them for suggesting I would love to hunt behind them to dig what they missed. Maybe it's the size of the acre, lol. 2 Link to comment Share on other sites More sharing options...
johnedoe Posted April 7, 2017 Share Posted April 7, 2017 1 hour ago, Steve Herschbach said: Except you have not really covered the acre. So let's go 50% overlap of the swings to get decent coverage at depth. 12.1 hours. And hit it from at least two different directions 24.2 hours. And you still missed a nugget or two! More food for thought. A one acre park in a city, detected for the last forty year by thousands of people with different detectors still gives up a silver coin now and then. One the flip side the first people on the first passes really do get the bulk of the targets. The easy stuff depletes fast. Then we spend decades eking out leftovers. I always enjoy following the guy on the left in you illustration...... The golfer...... Link to comment Share on other sites More sharing options...
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