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  2. Hey Flint, thanks for that. By the way, I love your stuff (frozen tundra tunneling / drifting)... wish I was half as tough as you my friend! Gravel pump - I wonder most about a dredging application to transfer a mixed size aggregate slurry, sharp or rounded rock, cobble, sand, broken bedrock etc.. could be for river dredging or for a pit bottom recovery application, to sweep off the bedrock after the excavator. The examples of pumping head ore I posted all appear to be of comparitively small size aggregate ores, sand and clay - some appear to use a screen (grizzly) at the intake nozzle so as not to pass larger rock. I haven't come across a working example of moving mixed size and larger aggregate but I wrote to Mark Keene about a video I saw on Youtube (see link below) and he said the 6" gravel pump would pass a 5.5” sphere, didn't mention if that was a continuous duty task but I assume the design is for river dredging (?)…I think it was a prototype but he said the’ve used these pumps for years. Gold dredgers on the Amazon use 12” gravel pumps mounted on huge barges, but again, it seems mostly for silt and sandy ores. I inquired about some inexpensive gravel pumps in South America (made in Brazil) and the manufacturer made a recommendation for 10 sets of wear parts (side plates and impellers) as well as an extra case or two - so that tells you something about the expected wear! (hence the rubber lined US built pumps). The advantage of a gravel pump is the ability to transfer a slurry straight up in the air and out over a distance to a recovery plant, but like you say needs big horse power…but also notice the engine / pump doesn’t need to be located near the intake…the Keene design claims 100’-150’ of lift using a pony pump and a jet to maintain prime for the 6” gravel pump coupled to a 100 hp diesel engine. Is it just me or is this not a very cool way to move head ore to a recovery plant. It's potentially a substantial cost savings in heavy equipment, maybe no need for a trommel because you could use a vibrating screen deck instead, the pump having a macerator effect to help bust up and dissolve clays. Maybe I should start another post titled “mining with a gravel pump" and see if it gets more attention than this one. I would love to learn more and what applications have proven to be practical. From Mark Keen: Jeff We do not carry the pumps shown in the links below. We use a Wemco model CE pump. We have used these for mining for over 50 years and have had very good performance reliability. The thing that we like is the 4” pump can pass up to a 3.5 sphere and the 6” pump can pass up to 5.5” sphere. Just the pump alone sell for just under 10K 6" gravel pump.
  3. I worked for an operation that used a very large rubber lined pump to suck the gravel coming off a 250 yd per hour trommel The 1/2"- slurry was pushed about 75' through an 8" pipe then up 10' on to a monster jig. It took a 100hp motor to run the pump but it sure did the job. I'm sure you could go smaller but you're still going to have to have some pretty heavy horse power.
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  5. When the excavator cannot scrape or dig into harder bedrock, what are other practical methods to recover the gold laying on top of and wedged into the bedrock? I suppose by suction using a gravel pump but have not actually seen this in use. Venturi suction like what is used on a typical suction dredge won’t work in a deep hole. A gravel pump however will transport the slurry vertically and out a distance to a wash plant. They make gravel pumps as small as 4”, popular in Brazil. Gold miners in South America use 8” 10” 12” gravel pumps as a primary feed method to a rustic sluice, mostly for head ore that makes a sandy / clay slurry, pumping from excavated pits. It’s impressive actually, very practical and definitely a cheap way to move ore to a recovery plant! In some cases the ground water supply from natural filtration maintains a certain water level in the pit along with some makeup water from another source. They also use high pressure pumps to hydraulic excavate and move material in the pit. Does anyone have experience with gravel pumps? Here’s some youtube links of the South Americans (note that environmental impact is of little concern!)
  6. Gary - I think there is some miscommunication here. I have no idea what you are asking, and I am kind of thinking you are not very clear on it either. Chlorite is a mineral which does not contain precious metals. Chlorides are a group of minerals, but the only ones you might see in an ore are silver chlorides, the mineral name of which is Chlorargyrite. See: Other precious metals do not form mineral chlorides because they are water soluble. I know of no process which extracts precious metals using silver nitrate. Pulverizing to more than 350 mesh is a mistake, and will cause lower recover of metals rather than more. You should not crush that fine. So the whole thing is pretty muddled and maybe you could start fresh and tell us in detail what you have and what are wanting to do,
  7. Not an awful lot to report. I'm about 9' in my drift which is about 5' wide and 5' 6" high at the top of an arch. My gravel is very atypical with large lenses of pure muck in between a jumble of chunky, fine and ground up shist bedrock, large cobbles, angular and rounded quartz and a smattering of intrusives. There's no bedding or layering except for the muck and I even have bones almost to bed rock, one of those being a young mammoth jaw complete with two teeth found 2' off bed rock. It's quite a conundrum. And the gold is not primarily just off bed rock but spotty and scattered throughout the entire column. Got any ideas? Heavy flood event?? I'm also continually making changes to my heat rods for the gravel thawing. My latest iteration should be ready to test out in about 2 weeks. From calculations and prior experience I'm expecting some really effective thawing. I'm also improving my drilling system making it faster and less labor intensive. My bucket hoist has been working nearly flawlessly. I'm ready for the cold to leave though I'm not looking forward to fighting with runoff again this year. Got some ideas how to mitigate it. More soon. Thannks all for your continued interest.
  8. Kurt, good to hear from you. Sounds like you got your hands full and a solid plan moving forward. Good luck, look forward to your updates. JR
  9. Have an opportunity this summer to detect tailings and bedrock at a large placer operation outside of Dawson City. Their wash plants screen at 5/8" and 3/4". Dawson City from my understanding has pretty fine gold. Obviously I am looking for nuggets. Does anyone have any knowledge of nuggets in tailings or perhaps in bedrock up there? What about nuggets in feeder creeks? Thank you for any info.
  10. Hey Steve, been following you for years, appreciate you sharing your knowledge. I have an opportunity this summer to travel up to a placer operation outside of Dawson City. The mine's owner is going to allow me to detect his tailings which, from a couple wash plants, is screened at 5/8" and the other at 3/4". I have used a GPX 5000 for a number of years but assume I should switch over to VLF for this trip. Without wasting too much of your time could you advise me on what I might expect gold wise (gold in quartz, nuggets) and in your opinion the best way to prospect for gold in these tailings. I will re-read your articles as related to this subject. Thank you sir.

  11. mile 98 we have had them for 9years we work them for 30 days each year
  12. Doug. That sounds like a plan. How far out are your claims? How long have you had them?
  13. Im glad every thing is going well next summer when we go to our claims up the steese highway maybe we could get together for lunch or coffee be careful down there Doug
  14. Hey guys, sorry for taking so long to respond. I'm back down in the hole where it's much warmer than top side. Finally got all systems working well enough to initiate another round of drilling and thawing in my main drift. Unfortunately, my heat rods weren't working like I had hoped they would and produced an uneven thaw. Consequently I had a fairly thick wall of frozen gravel on the face and well thawed gravel behind which necessitated a good bit of jack hammering to clean it all out. So I brought all the rods home and reworked them so they'll heat more evenly and also run a good bit hotter. I'll be testing them over the next two days. My young help disappeared when the snow and cold hit and put an end to above ground work. I may get them back soon. The began putting down a new shaft about 150' from my shaft which I'll eventually connect to via my drift. We're thinking the main pay streak is much closer to being below the new shaft. I'm developing a system for operating my hammer drill that allows me to simply set up the various support members, position the drill and then just turn a crank handle to either pull the drill bit into the wall or retract it. I've already drilled about 20 holes using the system and now I'm just simplifying it. Hopefully soon I can include some videos and photos of the operation. Well, that's about it for now. Stay tuned.
  15. Yes, time for an update! Also very glad to hear that you have some younger helpers!
  16. hi Jennifer , yep , they are a Mercedes benz unimog , mostly designed for a military application , top speed 50 mph
  17. flint are you doing ok we haven't heard any thing from you in a while hope every thing is going well for you doug
  18. I know this is a very old post, I've not been on this forum for years... but wanted to share that a few times I have seen amplifier boards, empty cases etc. for these batteries on eBay for sale. A prospecting retailer in Montana I believe was parting them out... let me go see if I can find the ad.... tick tock tick tock.. Nope, there are none listed right now but keep an eye on ebay, he had the audio boards and cases separately for cheap. Jen
  19. That's it a real functioning unit?
  20. John, no replies must mean lots of gold and everyone's keeping quiet about it. I'm a desert rat so no first hand experience in the area. Here's a link to an article about Mokelumne gold: Mokelumne Gold If you are an ICMJ subscriber here is a December 2006 article on the Mokelumne River: Mokelumne River Canyon ICMJ Article Good Luck!
  21. Thanks, I need to make one correction It is processed with a silver chloride I suppose this is used to precipitate the other things out of solution. I'm told there is a formula but that seems to be locked up.
  22. All minerals are subsurface estate Mike. It doesn't matter if the minerals are placer or lode. Known lodes are not included in placer claim patents. If a placer claim owner knows of a lode deposit on his claim he must either declare it as a lode claim and pay twice as much per acre ($5 per acre for lode as opposed to $2.50 per acre for placer) for his purchase or the lode will be excluded from the patent grant. This was explained in detail in Section 11 of the 1872 General Mining Act. The inverse is not true. Known placer deposits found on a perfected lode claim are patented along with the lode minerals. Also unknown lode deposits on a patented placer claim belong to the patentee as long as they were discovered after the patent was granted. Until a patent is granted both placer and lode claimaints own all the valuable minerals within their claim as long as the initial discovery supports the type of claim located. You can't locate a lode discovery as a placer claim and you can't locate a placer discovery as a lode claim. A placer claim can never be located over a valid lode claim but a lode claim can be located over a placer claim IF the placer claim owner or an invitee discover a lode. Uninvited prospectors can not discover or locate either type of claim over an active claim. You will probably find it helpful download and read the entire 1872 Mining Act if you want to get a better understanding of the principles behind the mineral grant.
  23. thanks Mr. T , it was very good , too much hard work for sure , lol , trommel ran great , looking forward to melt off so I can get back in , ive been trying to find a warmer spot to frequent in the winter months , but I think its cold everywhere , have 5 buckets of fines to clean up , but winter is still long , , I will do a lot more of the same thing this coming summer and I would like to prospect colorado for a couple weeks if I can get in where I'm thinking . I hope everything works for you this year just leave some gold for me . lol
  24. Reading surveying notes from the 1890's, the survivor had to survey underground placer workings on the located claim he was surveying. They probably had to verify there was no known lode veins in the workings. When he signed off on the survey, from my reading of surveying notes, he had to state if there were known lode veins on the claim. When the located claim was patented, how did the yes/no on known lode veins from the survey effect the mineral rights on the patented claim? Can mineral rights on a patented claim be split between surface and subsurface minerals?
  25. William, good luck with your testing and I hope you will return here and let us know how it worked out.
  26. Gary, not sure where Chris is. I'll try giving your question a bump and maybe it will attract some attention.
  27. That is a good looking well designed and built trommel! A similar one is on my project list. How did your season at your 80 acre prospect work out? My prospecting this year was a series of distractions and I didn't get to nearly as many places as I planned on. Wait 'til next year.
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