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No it's not illegal to pan for gold or metal detect for gold in California unless you are doing it where you should not. I locked the thread temporarily as it was veering into politics. Open again now. Please people, remember the prime directive on these forums. Zero politics!!!!!!!!!!!!!!!!! And be decent to your fellow forum members. It does not seem like too much to ask. Thanks.

Here is a map of the mines in California currently mining with permits and heavy equipment. There are new ones being approved on a regular basis. I have several clients that have permitted major mines in California in the last three years. Some of those are gold mines - both placer and lode operations. No form of mining has been outlawed in California. https://maps.conservation.ca.gov/mol/index.html I wouldn't look to flooding to move much gold in the waterways. Mass wasting from heavy rains does replenish gold in the waterways but without mass wasting I wouldn't expect much change in river placer gold availability. Watch for new landslides or major slump movement to bring fresh gold this spring. 🚴‍♂️

Just received my Steve's Detector Rods Deus 2 shaft and all I can say is WOW, I love it! It's light and tight and even better than I imagined. Excellent work, @steveg ! This allowed me to complete my 2 from 1 conversion and now I have full D2 and WS6 Master rigs. The force is strong with SteveG! 😎

So I did that with some quick and dirty air testing with my Nox 800 and the 6-inch coil (happened to be the coil I had bolted on, but it also provided a quieter test bed as I was able to crank sensitivity up to about 23 for all frequencies in my wi-fi saturated neighborhood). Ran a zinc penny, modern nickel, clad dime, and clad quarter across the coil (air test) at 4 khz, 5 khz, and the dime and quarter across the coil at 20 khz. The noise situation was such that I was able to run sat noise cancellations on all frequencies to get quiet channels on all 3 frequencies at Sensitivity 23. After running this test, I'm convinced that: 1) There is no signficant differences in air test detection depth between 4 khz and 5 khz for each of the targets. 2) The dime and quarter at 20 khz saw a loss of about 1/2 to 1 inches air depth vs. the 4 and 5 khz air test runs. Conclusion: "Quiet" 4 khz on the Nox does not come at the obvious expense of performance versus "Noisy" 5 khz and at 20 khz, all other settings and factors being equal, you take a performance hit on high conductive target depth vs. 4/5 khz, which is not surprising. As the resident doubting Thomas here, Dig, I know you are not going to take my word for it and will want video proof. Well, I leave it to someone else to go to the trouble of convincing you with that objective evidence. In the meantime, I welcome you or anyone else to share or post results of similar 4 to 5 to 20 khz testing and would definitely be interested in any results that differ from mine. But for now, I've convinced myself that 4 and 5 khz are basically equivalent in depth performance and I've seen 4 khz excel in EMI situations that shut down 5 khz, and to me, that's all that matters. Regards.

The remains of Whisky Jack's old cabin on the mine as it appears now.

At the risk of stirring a hornets nest I will throw in my theory as to why 5 kHz is a problem but not 4 kHz. Power lines seem to be a big source of EMI, yet the transmission frequency, as Jeff mentions, is 60 Hz, two orders of magnitude lower than metals detectors. However, I have read that there is a power line carrier communication (PLCC) signal that is transmitted along with the power that is transmitted in the kHz range to as low as 5kH. This is why meter readers are no longer required. The power useage in your home is sent via PLCC. PLCC is also used for home security systems, and home control and automation. I have used my DetectorPro UW, which operates at 2.4kHz, no problem right under power lines.

June 3 2002 Part Two After a long discussion, Jim made the decision to stay with the crew and continue to mine. Jacob said the only thing we needed to worry about was sabotage. He didn’t think the hooligans would actually harm anyone and neither did I. When we convinced Jim of this he was ok with things. We all just want to mine our claims. If only things could be that simple. Since we had moved our camp and were working close to it, we didn’t have to worry about anything there. Jacob set his gold cleaning operation up in a nice, shady spot and Vern would now be the pump tender and guard during the day. We will split up night duties to guard the pump and water line at night. With a plan in place, we got back to washing gold bearing gravel. We had a quick lunch and worked straight through until nearly dark. We had processed 60 yards of pay by day’s end. We cleaned out the tom and hauled the tub of concentrates over to Jacob who was only 200 feet from the dig site. The moving of camp turned out to be a good idea. Now Jacob will have himself a busy day tomorrow and show us what today’s labor produced. TO BE CONTINUED .................

As expected and I kept trying to say, nothing magical about the 4kHz with EMI, it's just a frequency that shifts enough away from an EMI source for many, no tricks, no magic, no funky new code to try eliminate EMI in a testing phase for a new model... Thanks for asking the question and the answer makes complete sense. Good on Minelab for a simple honest answer and also for adding the frequency to benefit those looking for these targets. China does have some mega hoards of coins stashed away 🙂 https://www.globaltimes.cn/page/202212/1280957.shtml An ancient coin hoard containing 1.5 tonnes of coins dating back to the Tang (618-907) and Song (960-1279) dynasties has been discovered in east China's Jiangsu Province. I'd like to find something like that as a silver coin hoard!!!

If anyone was curious, MineLab's response on the 4khz add was a very simple one: " The 4kHz single frequency option was added as we had a large number of customers in South East Asia that were trying to detect large stacks of silver coins (stacks of silver coins are buried all throughout S.E Asia) Each metal is reactive at a particular frequency, stacks of silver coins are very reactive at 4kHz which is why we added this as an option for customers. If there were stack of silver coins (or large amounts of silver) buried deep in other places in the world the 4kHz single frequency option would be the best single frequency to use. "

May the Fourth be with you, CAPT.

I haven't been able to get out to any relic sites in a while so I modified my mission to see if I could find any older relics in the city which was founded in 1871. There are of course limits to where you can detect in the city and getting private permissions here is not easy. So I decided to research some public areas like city parks to see if there was any chance of finding older things. Most of these places have been pounded hard since the 1970s until they outlawed digging in the 1990s. Until recently I haven't had much luck finding older items but I still go out to look when I can. Recently I researched a place that use to have a neighborhood for many years that was demolished in the 1990s for a park to be constructed. I noticed this place had a railroad track that used to run through it so I decided to give that area a try. I had the D2 with the 9" coil running my wide open Fast program. I wasn't finding much at first except a whole lot of modern trash from the nearby homeless camp, so I moved to an area close to the creek along a dirt road. That's when I started seeing older glas and pottery shards on the surface and then hit a loud 96 on the TID. It was too big for a quarter but I dug it anyway, because all 90s come out of the ground. 😉 It was about 4 inches down and in the hard pack so it took a while to chisel it out. When it finally came out it was a heavy solid brass "4" from a house number. It's not particularly old, but from the demolished neighborhood, so I slowed down and started finding some older bits of this and that. I wandered back onto the dirt road and hit a solid sounding 73 on the TID. It sounded way too solid to be a ring pull or pull tab and I dug out a compressed rounded dirt clod. As I started to peel away what hardened dirt I could it became obvious this was an older button, so I put it in the good pouch and kept on hunting. I didn't find a whole lot else so I headed home. When I got home I cleaned all the finds worth cleaning starting with the button. As I got more of the compressed dirt off, I could just make out the word "DENVER" and "DTCO" and some sort of rectangular object in the middle. I wondered if I had found an old Denver & Rio Grande button, but after searching the interweb I found only one reference to those words and letters which came from an antique auction site. It turns out it was a Denver Tramway Company that operated trollies from 1888-1893 and then changed to Denver Consolidated Tramway Company and changed all their uniforms and buttons. So I struck "old" in the city! Real old for my area! The rest of the finds were mundane except for a nickel plated screw cap marked "Morgan Wright" and "ACO" which I think came from an oil lantern and a brass thing that kind of lokks like a buckle part or possible hair clip of some kind. This is what one in good condition looks like: Inspired by my old button find, I researched another park that replaced another older neighborhood in hopes of finding more relics a couple of days later. When I got there it was also overrun with homeless people camps, but I pushed on and nobody paid any attention to me except for one guy yelling at everyone he saw. I was finding mostly modern trash and clad coins as I swept past the camp and made it to a treed area near the creek. I hit a modern coin spill of nickels, dimes, and one quarter and right near there I hit a 93-93 TID and thought it was another spill, but out pops a shallow big English penny. Well that seemed out of place, when not foot away I hit a tiny sounding 75 to 80 TID and out pops the tiniest crotal bell I've ever seen! Actually I think it's probably from a cat collar. 😏 I did manage to find a UMC Co Nitro No 10 shotgun cap that dates from 1895 to 1899. Well the coins had dried up and I wasn't finding any older items so I hit one more grove of trees to see if there was anything else interesting around. I got a bouncy 88-90 that I thought might be a copper memorial penny but it turned out to be a 925 silver ring with 10 diamond chips on it. Well that wasn't old, but definitely the find of the day for that hunt. So while I didn't find any old relics on the 2nd hunt, I did score silver and copper! I guess sometimes luck is better than research! 🤣

The Season One book.

We found Sarge waiting for a train at the Paxton Depot. He had been waiting for over 78 yrs.

Thanks guys, appreciate your kind words.

The 2002 digsite area.

Looks like a good place to dig a gold coin 👍

Being 33 years ago, my memory of the details of Bruce's experiment is not great, but he certainly had some intriguing ideas. At one time he developed a system that could tell definitely whether a tennis ball was inside the line or not. This involved a wire mesh beneath the court and balls impregnated with metal. A clever but expensive concept that got as far as a prototype before the far less expensive 'Hawkeye' system was developed and accepted. I have a foggy recollection of a partner being involved in that project who left Bruce holding all the debt involved. Another experiment that I was involved in was the EMDAR (electronic metal detecting and recovery) project. This was a hopper (with grizzly's) that fed a conveyer belt with a metal detector (VLF in those days) positioned beneath the belt. When a signal was detected a gate at the end of the belt directed that portion of material into a holding drum before returning to directing into the reject heap. The whole apparatus was on skids so that it could be moved with the use of a backhoe - loader which also fed the hopper and moved the reject pile as it accumulated. The whole idea was to use EMDAR to separate oversize material in a mining operation. I had access to a deep lead mullock heap that contained metal (gads, machinery bits, broken picks etc). It also had quite a few bits of gold up to an ounce and even better. This had been a very rich mine and the miners had been a bit careless with recovery. There were a few bugs in the system, but eventually it was up and away. At the end of a trial period I used a small dozer that I owned at the time to push out a similar amount of material and detect it by hand. I then pushed out the EMDAR reject heap. The result was that it took less time to push, detect and then re pile the material than to put it through the EMDAR and this method also recovered metal (gold included) in the reject heap that EMDAR had missed. I then made the mistake of voicing the opinion that they had developed 'technology for technologies' sake'. I should have shut up as I could tell that the Minelab crew were not impressed with me. 'Shoot the messenger". Minelab went on to actually persevere with EMDAR and I did see one unit for sale in a mining magazine at one time. I remember that the machinery was priced at Au$80,000 new. I have no idea of how many were built. Up until that point I had been fairly closely involved with Minelab, but after not quite much so. Possibly just coincidence. What not many people know is that Bruce's passion was not metal detectors at all, but HiFi, and he went on to develop high end sound systems.

Saw that video...posted to it... copy below. I found many errors in your testing! I call operator error? X-Terra pro is a different beast and you have to do things differently when switching frequencies, etc. I've been reading the 50+ page manual and have learned a lot... 1. Per the manual you need to do another ground balance any time you switch frequencies. Or it resets back to the default which is in the middle of the scale. 2. The ground you were testing in had lots of iron in it! So why did you leave it in Recovery Speed 1? 1 is low recovery 2. is medium recovery 3 is high recovery With all that iron in the ground you needed to be on recovery speed 3. (Page 32 of the manual) All that iron at recovery speed 1 was also causing more iratic ID #s too. 3. At the end of the video I saw you do a ground balance over iron which it registered just before that. Per the manual always do a all metal mode check of the ground you're going to use for ground balance to make sure it's clean before doing this. Any time you switch frequencies you're suppose to do a ground balance again as the unit will go back to the default setting (per the manual page 16 & 23). Also, recovery speed 1 gives least sepration. 3 gives the most....never saw you put it on 3 🤔 as you could hear the null iron. Other things to consider... This is a prototype of the coming retail unit. Will retail units be the same? Price will surely be more with all that carbon fiber. How much bigger is the Simplex coil or just rounder? Many say size matters! I call for a re-match with all this in mind 🙂

Awesome Cap'n! Now all you need is the 11x13 🤣 And just so you know, that shorter D1 cable you put up a while back works very well with the D2, it's an underwater option. 🙂 Much shorter than the D2 waveguide and much lighter.

Hi, that's a nice find. I have one from a clock or furniture ornament. Typically French, they are normally described as Empire period. That being (for mine and others like it) c1860ish Napeoleon III of France, rather than Napoleonic which has a different meaning. The wingspan just over 16cm

When did you get added to the Minelab marketing payroll?? 😏

I dug this pendant yesterday May 4. My wife said that it was 10KB and I saw 14KB when I looked at it. I googled the KB to find out what the B stood for. What I found was that if it didn't come from Mexico, it meant "bonded" or plated. Well the 15 told me that it was a Quinceanera piece of jewelry, so the Mexico origin made sense. Today I tested it and it only tested 10K. I got out my 40x loupe and could clearly see that there was a 4 counter stamped inside the 0. So what I am thinking is that the B stands for bonding the Tri gold together. The main part is yellow gold, the center is Rose gold and the number is white gold. Can anyone confirm my hypothisis? Thanks, Joe

Came across a small circuit for relaying the frequency of a coil to a computer using a microphone jack and some software. I have a scope which will do the same thing but has to be hard wired to the coil or control board of the detector. What I liked about the circuit is it didn't need to be wired to the scope but the scope doesn't supply power to a circuit so I added a battery and then a couple leads to hook to the scope. I printed the little coil on my fdm printer and wound the coil on it. Layed out the part in pcb software and printed the circuit on some silicone transfer paper then transferred and etched my own pcb. Soldered in the parts and tested it. Lastly I was happy how accurate it was with just a small 2hz when powered on which could be the capacitor tolerance. What also is pretty cool is I can move the sensor away from the coil and physically measure the signal drop off. Surprisingly the signal will drop off pretty sharp. This is doesn't necessarily tell you how deep a detector will report an object it senses, just how far the coil goes. On my Multi Kruzer it showed the Superfly coil being a little out of frequency as the frequency was high which means I probably have a bad connection in the cable. The other coils tested fine and between 5,14, and 19khz there was little difference in range. On the Tejon I tested stock coil that came in spot on 17.5khz but the Cors Shrew came in at 16khz not that it matters that much on that machine. Apex was interesting. The Ultimate 9" was 12" and the Reaper 10x14 coil was 14", only 2" more. Now between frequencies and modes. The 20khz was the most followed by MF and MF and range dropped down as frequency was dropped in single freq modes. If I get my hands on a Nox and Legend would like to test those just for kicks. Anyways whole purpose was to make a little test device so I can keep working on my coils and test coils that maybe faulty. Just enjoying other aspects of the hobby. Enjoy!

Pics of mine

The majority of pulse inductance detectors are designed to operate with coils that have an inductance of 300 microhenries with a resistance of less than 0.5 ohms and less than 400 picofarads of coil and lead capacitance. A small coil requires almost as many feet of heavy gauge wire as a large coil to meet required specifications. This means that the small coil space severely limits winding forms. My six inch GPX 6000 mono coil (below) required two flat wound layers which fill up the housing. The eight inch GPZ 7000 concentric coil (also below) was accomplished by stacking the windings vertically which doubled the height of the coil. A coil lead is approximately 50 to 100 picofarads which is considerably less than normal coil capacitance. Moving the receiver or preamplifier into a pulse induction coil is more of a problem than with a VLF detector. It would also make aftermarket coils very difficult and expensive. The GPX 6000 coils are very sensitive to small and tiny nuggets. There is more to gain in signal and EMI processing than in coil design.

The Paxton Hotel - one of Jacob's old haunts from back in 1936/1937. The place is said to be haunted. My wife & I stayed on the property for a month back in 2015 but we never saw the ghost.

Ace Apex in the sf modes 5-20 khz and mf mode pics. Quick test i did yesterday. Sorry too lazy to hook scope to the computer or look for a thumb drive lol

I don't have a part # on diodes, I robbed them from another board. All that was build with spar parts I had with exception of housing and blank pcb I snagged off of amazon. Used silicone transfer paper that works on a laser printer. I highly suggest using manual feed on printer and tapeing a 3-4" regular paper leader to the lead edge with masking tape.

The old road that goes up to the 1937 dig site which was our 2002 dig site.

I always use pinpointers in vibrate mode. They work that way with any detector, and keeps it simple. I do like the Pro-Pointer series. I have a Z-Lynk Carrot and never use it linked up. My main pinpointer is the regular AT version and I got the other for backup. I figured I might try the Z-Lynk feature but never get around to it. Bottom line for me at least is I don’t need audio at all on any pinpointer, and wireless audio even less. But I’ve tried lots of pinpointers and always come back to the Garrett. Loved my F-Pulse for a while but it just up and died on me, and with two Garrett’s in hand I doubt I’ll be needing anything else for a long time. That said, for those that want it, a Garrett WT-1 transmitter box, WR-1 receiver box, MS3 headphones, and Z-Lynk AT Pro-Pointer will give you instant pairing high speed wireless, including integrated pinpointer, that will work on every detector you own.

Post production X-Terra Pro versus pre production Simplex Ultra by Sid, using deep mid to high conductor targets in slightly mineralized ground. Same targets, same time testing. I wish he had setup up both detectors in 2 tones. Other than that, an honest test.

Sid could have put the X-Terra Pro in Square Wave Depth Tones and run it 2 tone VCO. That is the closest audio setup to the Simplex PWM 3 tone VCO. Sid tried all of the frequencies including 15 kHz using the X-Terra Pro. As far as I can remember, the X-Terra Pro unit is an end user model and not a tester. The Simplex Ultra is a pre production, test model. I also just can't deal with the Simplex squawking audio. But that is just me and my own subjective opinion. These are single frequency detectors that cost well below $400 US. Don't expect them to ID like an SMF on targets in a fairly trashy area. I thought they did well for what they are.

Hi,I have that coil in a nox 800 and you have to adapt a bit, let me explain... In the first place, and this cannot be changed, it will be noisier as it is bigger. Yes, but also deeper!. You can't have both. Obviously, the precise localization will always be more difficult. But, if you lower a sensitivity (which I see you've already done) and reduce the recovery speed, it will become a weapon of mass destruction... I work in sensitivity ranges of 17-19 and recovery speed around 2-3. You will have "longer" tones but serenity will return to your headphones... That coil is terribly deep, and well built. A little heavy (shorten the lower shaft a bit, you'll see how much better balanced it feels)...

@Kctrading here is the issue in my opinion Sid should have put the Xterra Pro on 15 KHz and never changed frequencies at all as the Simplex Ultra is a single frequency 15 KHz detector,if you are going to do test do apples for apples. Sid was trying to see if he could get the Xterra pro to hit as good as the Simplex Ultra and in my opinion the Xterra pro failed because no matter what Sid did he could not get the Xterra Pro to perform as good as the Simplex Ultra. I personally have no interest in either of these detectors but lets face it if i was going to purchase one of the two based on that video, it would be the Simplex Ultra, but I still cannot stand those tones which sounds like the Aflac goose, Aflaaaaac,Aflaaaaac

If you never intend to buy any other Z-Lynk product it is pointless to get the Carrot with it, just get the standard one. Z-Lynk is really cool though, so it might be worth considering, it's a great fast reliable wireless audio transmission technology I personally think is better than aptX Bluetooth Low Latency used by the Nokta Legend. The Nox 700/900 uses a form of Bluetooth LE which is great, we just don't know yet if it's standard or stuck using their Minelab branded products, it's possible to encode the signal so only a certain brand of transmitter/receiver combination can pair, we are all just hoping they haven't done that. Although in my case as an example I bought the XP-Mi4 Pinpointer thinking no way in the world would I ever buy an XP detector so I don't need the wireless version, and then I bought an XP detector so I'm kinda wishing I bought the XP Mi-6 Pinpointer with the wireless tech so I could connect them. The Garrett Pro Pointer AT is my favourite pinpointer.

Yes the .22 bullets were just a few inches deep. My latest coils to be tested the next time in the field are below. One is a 6” mono for the GPX 6000.The other is a 8” concentric for the GPZ 7000.

rrhttps://www.google.com/search?q=pendule+empire+aigle&sxsrf=APwXEdcZxm6gz8mxywIatc_c4n799kguLw:1683243305304&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjL06H66dz-AhVOFcAKHe2DAToQ_AUoAXoECAEQAw&biw=1440&bih=820&dpr=1

Great little project find ! Not much in there either. I probably have it all except the case....and a scope, (I live in a camper now.🙄) and I think I can still find DigiKey and Mouser !

I disagree with the absolute "can't know the difference" statement as there are probably sophisticated ways to use signal processing and machine learning (assessment) to determine with good certainty the nature of the magnetic field disturbance (i.e., target based, EMI based, or ground based) under normal search conditions and to dynamically change filtering. I don't know of any specific detector that does this...yet, but I find it totally plausible. Automatic ground balancing does this to a certain extent by continuously monitoring the level of ground mineralization, and executing a ground grab when signficant changes in mineralization are sensed. But it can also be fooled by ferrous targets. But for today's detectors we are instructed to set up specific initial conditions so that basic assumptions can be made (or directly measured) to execute semi-automatic noise cancel (frequency shift/filtering) and ground balance routines. In the former, the detector "brains" either know (via a sensor) or assume the detectrorist is following instructions and the coil is NOT moving so any magnetic field imbalances must be due to EMI. Similarly, during ground balance, the machine "knows" or "assumes" you are swinging or pumping the coil over target free ground, so any magnetic field imbalances must be due to ground conductivity. Either way, we trust the designer not to significantly degrade performance while going about the process of finding a quiet channel or setting the ground reference point, as instructed. Be curious all you want. But continuing to ask forum members here "why" or "how much" performance is affected by these EMI and ground noise cancellation routines is just unverifiable speculation precisely because we are not privvy to the specific design details. I you want to get down and dirty into this type of technical detail, I suggest visiting Geotech's (Carl Moreland's) excellent detector design focused forum. https://www.geotech1.com/forums/forum Carl is a forum member here. Has written a number of books on detector design that are referenced in Steve's detector resources list. Cheers

Yes! Steve's Rods are simply amazing quality and very well thought out. I was in on the first wave and was blown away at the workmanship. I have the antenna wire through the shaft and it works perfect. I did the dual setup right away with mine. Cheers and HH!

I did like his video...prolonged suffering?...maybe a tiny bit...you need to put the hours on the machine just as with any other. The 800 popped and farted on tiny objects just like the M-core does..neither were a beginners machine in my opinion. The graph on the M-core may be a little more confusing to those not used to using a detector such as the CTX. The one place where I wanted to use the M-core the most is one of the places where I have had the most annoyances with it. It's a fresh water beach loaded with black sand and bottle caps of all varieties. I'm thinking this will change when we get the small coil cuz sometimes there are multiple targets under the large coil. There has been some talk of wide range of TID's on the M-core...I think this has a lot to do with depth and high soil mineralization. Very deep targets over 10 inches mild soil inches like where @phrunt hunts are probably the reason. I can usually accurately predict targets in the parks that I hunt even though the numbers may vary 2-3 digits so I've not found that to be too much of a problem. I've not picked up a detector in a couple months due to other projects but will get back to it soon...there are two kinds of serious treasure hunters those that have a M-Core and those that are gonna get one...😊 strick

The frequency shifting would be an awesome feature to have on something like a Nox 900, and something they should have done for it's single frequency modes, how cool would have have been if you could switch to 4khz, then also adjust it in small increments like the T2/F75 to get it fine tuned to the local EMI. Perhaps this is what the noise cancel tries to do, and you can manually adjust the noise cancel channel. As Steve said though, get it as good as you can, lower the sensitivity if need be which often it is, or just change to a smaller coil which helps a lot. There are ways to deal with it. One thing I've found is you're better off lowering sensitivity to clear up EMI than trying to detect through it, you get better performance with sensitivity and depth by lowering sensitivity than you do trying to fight it.

First comment - chill out folks. Like seriously take a chill pill. It's just metal detecting. Of course just changing base frequency can reduce EMI by shifting away from what caused the EMI. And no, there is not and will not be any magical fix short of basic trade offs. The detector is just a dumb machine and can't tell signal generated from a target by that caused by spurious EMI. Reducing a particular EMI problem can also reduce a certain target signal because they are identical as far as the detector is concerned. The engineers can shift frequencies or use frequency comparison tricks to try and sort this from that, but the bottom line is any filtering always comes at a cost. A trade off where you gain something but lose something else. I'm not just speculating here - I was very involved in working on EMI mitigation with Equinox and it is not ignored at all. The solutions are just not as simple as people think. Well it is I guess. Go back to using a lower gain 1980s detector that will be nice and well behaved. It's the fact we are pushing the tech to the limit and running extremely high gains that are the source of the issue here. The solution is simply turn down the sensitivity until the EMI goes away. Happy?

Good afternoon. Many thanks to everyone for the discussion! We were at the antique dealer today. He said that this eagle was indeed from the era of Napoleon! The antiquarian is sure of this, as he has already met similar artifacts. The eagle is gilded and, most likely, is a decorative element from a watch (watch case) or a cover element from an inkwell for writing. He also said that with a very high probability the thing was made in a single copy for someone to order and there are no more analogues.

Gold Mining - where do I start? It's a cut throat business where people will screw you for an ounce of gold or less. People get gold fever which means they go bat sh.. crazy sometimes. You can't reason with them when they have the fever. I have been in fights with mining crews both on & off my claims. I've watched people make extremely poor decisions that cost them everything including their wives and all their money. I've seen people hit nice gold and it was fantastic. I saw a little crew pull over 50 ounces in 5 days with the gold being less than 8 feet under their feet. I happened to be on their crew helping out when it happened & it was great fun. Mining is an emotional roller coaster. That's why my little company is now more into exploration & leasing than actual mining although with gold now sitting at $2060/OZ & showing no signs of stopping I may need to jump back into one of those old dig sites from 1936 soon.

River streams have a large body of water compared to the river bed (floor), so the moving mass is mostly water. In alluvial fans, you have a much higher ratio of solid matter that moves along with the water, hence the overall density that moves in these fans is much higher. This also results in heavier rocks (including gold) being pushed up as the mass is moving. This is what makes alluvial fans so attractive for prospecting, in particular at the Apex widening, because the heavier stuff moves up and not down. You can easily see that yourself when you walk up alluvial fans and you notice that larger rocks and heavy material is often "floating" on top of lighter material and sand underneath. There is a lot of studies done about mass movements in alluvial fans, you can also find some of this on youtube. Hope this helps. GC

I live in Northern Calif. There is not all that much snow here. Some places farther south may have got more snow, but I don't think it will affect much. It's usually flooding produced by rain that moves gold, and even then it has to be something like a 500 year flood event.

Its nonsense, there cannot be any goldrush if you are not allowed to prospect or mine.

I made a short video of the sensitivity and range test of the CTX 3030 on a small low-conductivity target 1/24.. at a depth of 7.5 cm .. on multi-frequency channels 11-10-1... The test was done on the sensitivity of the detector 21...to see the difference in range in this test... with CTX 3030 ... channel 11 gives the best signal, channel 10 gives a slightly weaker signal,,, but channel 1 no longer gives any signal to this small target at a depth of 7.5 cm... this can indicate... how we can influence the detection results by using a different multifrequency channel in the CTX 3030 or in the Etrac..

Yes you need a scope. Here is the circuit and pdf to etch. Single sided copper on bottom. Freq Sensor.pdf