Jump to content

Steve Herschbach

  • Posts

  • Joined

  • Days Won


 Content Type 


Detector Prospector Magazine

Detector Database



Everything posted by Steve Herschbach

  1. Building a PI that detects small gold is not new. I know you have done it Reg as have others. The issue is - where does a person get one? As far as I know Eric Foster hand building units is as close as we have got to such a detector commercially. 5uS At The Beach Link deleted since Findmall update broke all old links Getting something like this into mass production is the issue at hand. Even then price is going to be a barrier to entry without serious competition. White's could easily do it if they wanted to. Just put out a TDI that adjusts to shorter delay lengths. But they won't. From your perspective why is that Reg? What is the hardest part in producing a hot PI? The coils? Something else? I assume the efficiency of the ground balance circuit gets more critical the hotter a PI gets? You have covered this all very well in the past at http://forums.nuggethunting.com/index.php?/topic/3802-oxymoron-pix-of-invisible-nuggets/?p=25910 This statement you made there would seem to illustrate an issue with the ATX and coil falsing when bumped: "If the sample is taken right at the edge or just when it will allow the circuit to work, generally, the coil becomes hyper sensitive. The upside is the coil will detect smaller stuff, seems extremely sensitive, etc. The down side is it will also be noisy, usually generate false signals if bumped, and will generate much stronger ground signals to deal with." The ATX obviously has a fairly short delay but Garrett is not saying what it is.
  2. I am sure we will not be seeing a 1 uS delay; something around 5 uS to 8 uS would be more feasible. From Link deleted since Findmall update broke all old links "High sensitivity industrial PIs which can detect fine gold chain would have a pulse delay of 5uS or less, a much faster pulse rate, a short transmitter pulse and a lower inductance coil, maybe 50uH." See also Link deleted since Findmall update broke all old links Again, the problem is that as you get hotter on small gold the detector also acts more like a hot VLF than a PI. Building a hot PI is certainly possible but dealing with the problems that come along with doing so is a challenge. When I was in Australia we did a little head to head hot VLF vs hot PI. The bottom line is the VLF got the tiniest shallow gold but the PI was able to hit a bit larger stuff deeper than the VLF could see. It takes the whole VLF vs PI thing down to a battle in the top few inches with both having strengths and weaknesses.
  3. Minelab does love their acronyms! MPS (Multi Period Sensing), DVT (Dual Voltage Technology), SETA (Smart Electronic Timing Alignment), FBS (Full Band Spectrum) and a host of others. There is a bit of marketing wizardry at work here but the basic fact is this stuff is real and is very often what gives Minelab an edge versus the competition. When Minelab comes up with a new acronym I have found it is worth paying attention to. The soon to be released Minelab SDC 2300 introduces a new acronym - MPF for Multi Period Fast. This refers to a basic pulse technology limitation - the duration between when the transmit (TX) mode shuts off and the receive (RX) mode kicks in. This "pulse delay" is a brief window measured in microseconds (uS) and it allows time for the electronics to settle before the receive phase. It also governs how small a target a PI detector can detect, as during that brief delay the signal induced in the target decays rapidly. If the target signal decays in a time frame shorter than the pulse delay the target is invisible to the detector. Small targets and poor conductors especially are governed by this limitation. The plus side is the signal from most ground, hot rocks, and salt water also disappears during the short pulse delay period, which is what makes PI detectors work so well. Due to a desire to limit the signal from salt water plus limitations in mass production of coils the shortest pulse delay commonly seen in consumer detectors is about 10 uS. Here is what Minelab has to say about MPF: "MPF Technology - MPF (Multi Period Fast) technology incorporates extremely fast Pulse Induction switching between Transmit (Tx) and Receive (Rx) detector signals. Therefore minimal residual transmit signal is present during the receive cycle, enabling clear sharp detection of very small gold." Multi Period Fast (MPF) PI detectors can be designed with a shorter pulse delay than 10 uS, but it takes very tight tolerances and especially very well built coils. This normally requires units to be hand built and calibrated, increasing their production costs considerably. Much of this has been discussed on Tom Dankowski's forum in the past regarding beach detectors and the limitations thereof. This is pure speculation on my part but I do believe the MPF technology aimed at delivering enhanced small gold capability is also partly responsible for the price of the SDC 2300 and the fact the coil is hard wired. Both make absolute sense given what I think I know about building a PI specifically designed to detect small gold. That ability comes at a price, as the detector may have issues also with hot rocks and salt water, but these can be overcome through ground balancing technology. It is a tough nut to crack and produce at the consumer level, and many people at Tom's forum have been wishing for just this kind of detector. The potential exists not only for gold prospecting but micro-jewelry detecting. Anyway, time will tell and hopefully answers will be forthcoming soon. I am in line for a SDC as soon as I can get one and it may fill a role I have never focused on with my GPX 5000 - getting the small stuff. I have seen what a GPX with a small coil can do if properly tuned and in expert hands and I am hoping the SDC is set up to be more grab and go for that type of detecting. That way my GPX remains my elephant hunting gun and I will grab the SDC to clean up the crumbs. It may make previously pounded locations "come alive" again in missed gold nuggets. I have been ignoring the SDC waiting for mid-2014 to get closer and now that it is sneaking up I am doing my usual get excited by new toy thing! More information on the new Minelab SDC 2300 at http://www.detectorprospector.com/gold-prospecting-equipment/minelab-sdc-2300-waterproof-gold-nugget-detector.htm
  4. This is some recent information about the ancient tertiary stream channels of California. It updates ideas about where the gold in the channels came from and theorizes about upper extensions of the channels all the way into Nevada. "Speculative upstream continuations of various branches of the Tertiary Yuba and American Rivers enter Nevada near the Fort Sage Mountains, Hallelujah Junction, Reno(?), Little Valley, and Hope Valley (via Echo Pass). One branch of the Little Valley channel can be speculatively traced to the vicinity of Yerington." There are also a few very good maps included that alone make the article worthwhile. Garside, Larry J., Henry, Christopher D., Faulds, James E., and Hinz, Nicholas H., 2005, The Upper Reaches of the Sierra Nevada Auriferous Gold Channels, California and Nevada, in Rhoden, H.N., Steininger, R.C., and Vikre, P. G., eds., Geological Society of Nevada Symposium 2005: Window to the World, Reno, Nevada, May 2005, p. 209-236 Download as a pdf at http://www.ucmp.berkeley.edu/science/profiles/garside_paper.pdf
  5. Hi Bob and Alan, Thank you both. Alan, thank you in particular for your easy going humor. And a shout out to Harry - nice chatting with you this morning, though I left feeling more scatter-brained than usual! A pleasure and I look forward to seeing you all in the future.
  6. Well, I think it went well, with good attendance. All I can say is I had a good time, Happy Camp is great, the people fantastic. Good seeing my old friend Jim Foley after way too many years.
  7. I have never done any ATX videos so it was not me. I really like my ATX but as my long review tells I am not putting my GPX aside in favor of the ATX. I disagree with any videos implying that is a good idea. Many of us swear by the Gold Bug 2 and the Gold Bug Pro both. Mine complement each other well, with the GB2 getting the crumbs that in my opinion the GBP will not. As Ray says the GBPI gets better depth overall.
  8. Here is enough on the ATX vs GPX to put you to sleep -http://www.detectorprospector.com/forum/topic/160-garrett-atx-vs-minelab-gpx-5000/ Plus Ray has a souped up 3000!
  9. The SCUBA units are designed to work in salt water. Salt water is conductive and actually has the same reading as a very small gold nugget or even as a very large gold nugget at the edge of detection depth. The salt water signal increases with depth, and so SCUBA capable units are detuned to a certain degree to eliminate this salt signal. This also sacrifices a degree of sensitivity for dry land gold prospecting.
  10. Fred got it. Everything from low mineral great for VLF ground to stuff that will challenge the best PI in California. The CTX and ATX are no more SCUBA capable than the AT Gold. All three are good to ten feet and my CTX I do not think I would trust to that. Frankly, I would separate SCUBA needs from nugget detecting needs. The SCUBA units good to 200 feet do not make the best nugget detectors but if I had to pick one it would be the Garrett Infinium. I have found gold as a California newbie with the Gold Bug Pro, Gold Bug 2, F75 SE, ATX, and GPX 5000. A Gold Bug Pro would cover me for most stuff but there are plenty of places I would rather have a PI. Check out the posts from a California expert on this forum - Ray Mills (TRINITYAU)
  11. Finally, open and closed scuff covers for the Garrett ATX mono and DD coils.
  12. It is being reported that Kevin Hillier, the man who found the Hand of Faith nugget, has passed away. http://golddetecting.4umer.net/t18885-pmav-member-and-avid-prospector-kevin-hillier-finder-of-the-hand-of-faith In other news, the Hand of Faith itself has moved from Las Vegas to Biloxi, Mississippi. http://www.sunherald.com/2014/04/16/5500929/golden-nugget-will-celebrate-end.html
  13. Hi Dave and Steve, Sorry so late to reply, been busy with family. I am driving up early tomorrow and have a room in Yreka tomorrow night so basically am only at Happy Camp for the afternoon/evening but will be happy to see you all and see what we can do detector-wise. I am happy to work with folks in the afternoon one on one with detectors as much as people and time allow. See you tomorrow!
  14. I agree Reg that this is a real bargain bang-for-the-buck detector. It is too bad it is seeing very limited distribution and will possibly be available for only a limited time. Once stocks are depleted that may be it. Glad to hear you have one and can comment on it for people who are interested. I like what you are saying about the 6" coil.
  15. It will be what it will be. I am in line for the SDC 2300 as soon as they appear, hopefully before I hit the road for Alaska. If that happens it may work out great because if it does what I think it does I may have the perfect location up there for giving it a go. The way I look at it I need just two ounces of gold to pay for the SDC so that is the goal. Anyway, if I do end up with one I will report on it and how it works for anyone that has questions.
  16. Many people dream of finding a big discovery, a gold mine that could make them rich. The problem these days is regulations and lawsuits have driven the cost of mining so high you need a really big find to make a go of it. Remote sites with a lack of infrastructure face even bigger hurdles. I was told ten years ago in Alaska that we needed at least a couple million ounces in the ground to be a mine these days. This new article at http://finance.yahoo.com/blogs/daily-ticker/gold-industry--needs-to-get-its-act-together---randgold-ceo-142651501.html I found interesting due to this quote: "In the accompanying interview, Bristow discusses the outlook for finding properties that meet its new standard of at least 3 million ounces of gold reserves at an assumed price of $1,000 per ounce and internal rate of return of at least 20%." Now this is hard rock mining by the big boys but it highlights still the hurdles miners face these days trying to bring a profitable enterprise to market.
  17. I would like to give sniping for gold with the ATX a try but am too busy until fall so it will have to wait. The plan is to use the 8" mono or smaller Infinium coils.
  18. Prices have been on Australian and Canadian sites since March. $3999 Australian Reeds Prospecting $3800 Canadian Radioworld Toronto
  19. Yeah when the X-Terra 30 and 50 came out everyone thought the 50 was the top-of-the-line model, then just a few months later the X-Terra 70 came out. That did irritate a lot of people. In this world of cell phones and computers though the detector world is slow by comparison.
  20. You will get no argument from me on your points Chuck. I agree.
  21. The largest cache of gold treasure thought to ever be unearthed in North America is on display this weekend at a California antique show, providing the public with a rare opportunity to see the nearly perfectly preserved coins in person before they are sold later this month. Called the Saddle Ridge hoard, the roughly 1,400 U.S. gold coins date from 1847 to 1894. They were found in nearly mint condition inside eight rusty cans by a couple taking a walk on their property in California's gold country in February Saddle Ridge hoard coins will be available for public viewing Friday and Saturday at the Old West Antique Show at the Nevada County Fairgrounds northeast of Yuba City, Calif. The coins will be available for sale on Amazon.com at 9 p.m. PDT, May 27. In the time since the find was publicly announced in February, no credible claims to the coins have been received, according to Kagin's, including the U.S. Mint, which debunked theories that it was tied to a heist in San Francisco in 1901. http://www.latimes.com/local/lanow/la-me-ln-california-buried-gold-coins-display-20140509-story.html
  22. Times sure have changed. Used to be the first I knew of a new detector model was when I got the latest magazine and saw the ad. The dealers had them by the time the ad hit the street. Or the new product catalog came out for the new year and it was loaded with new models. Sometimes entire lineups changed overnight. Now we get leaks on the Internet. Fisher F19, Minelab SDC 2300, Tesoro Cazador, and the top secret White's SPP. Models are leaked way ahead of release, often with the vaguest of information. On one hand this breeds excitement and speculation but I suspect for most like myself it is just frustrating. Do you like advance notice? Or do you prefer not to know about something until you can actually lay hands on it?
  23. It certainly looks like an inventory clearance deal with limited availability. I suppose if it was a hot product though they could just make more. But there may not be much money in it for them at this price.
  • Create New...