Bedrock and Gold: The mysteries . . .

Lanny in AB

Gold Member
Apr 2, 2003
5,670
6,413
Alberta
Detector(s) used
Various Minelabs(5000, 2100, X-Terra 705, Equinox 800, Gold Monster), Falcon MD20, Tesoro Sand Shark, Gold Bug Pro, Makro Gold Racer.
Primary Interest:
Prospecting
Do you love to chase the gold? Please join me--lots of gold hunting tips, stories of finds (successful and not), and prospecting poetry.

Nugget in the bedrock tip:

I had a visit with a mining buddy this past weekend, and he told me of an epic battle to get a nugget out of the bedrock, and of what he learned from the experience. I thought some of you might like to learn from his mistake.

While out detecting one day, he came across a large sheet of bare bedrock. The bedrock was exposed because the area had been blasted off with a water cannon (a monitor), by the old-timers! It was not fractured bedrock, in fact it was totally smooth.

He was not optimistic at all of the prospects of a nugget. But, for some reason (we've all been there) he decided to swing his detector over that bedrock. After a long time, just as he was about to give up on his crazy hunch, he got a signal, right out of that smooth bedrock.

There was no crevice, no sign of a crevice, nada! So, he had to go all the way back to camp to get a small sledge and a chisel. The signal in the rock intrigued him, but he still wasn't overly optimistic. For those of you that have chased signals in a similar situation, sometimes there's a patch of hot mineralization in the bedrock that sounds off, but this spot, according to him, was sharp and clear right in the middle of the signal, not just a general increase of the threshold like you get when you pass over a hot spot in the bedrock.

Anyway, he made it back to the spot and started to chisel his way into the bedrock. If any of you have tried this, it's an awful job, and you usually wind up with cut knuckles--at the least! Regardless, he kept fighting his way down, busting out chunks of bedrock. He kept checking the hole, and the signal remained very strong.

This only puzzled him all the more as he could clearly see that it was solid bedrock with no sign of any crevice. He finally quit at the end of the day, at a depth of about a foot, but still, nothing in the hole.

An experienced nugget shooting friend dropped by the next morning to see him, and asked him how the hunt was going. My buddy related his tale of the mysterious hole in the bedrock, and told the friend to go over and check it out, and see if he could solve the riddle.

Later in the day, the other nugget hunter returned. In his hand was a fine, fat, sassy nugget. It weighed in at about an ounce and a quarter! After my friend returned his eyeballs to their sockets and zapped his heart to start it again, he asked where the nugget had come from.

Imagine his surprise when he heard it came from the mystery hole!! He asked how deep the other guy had gone into the bedrock to get it. "Well, no deeper" was his reply.

So, here's the rest of the story as to what happened. When the successful nugget hunter got to the bedrock, he scanned the surface got the same strong signal as my buddy. He widened out the hole and scanned again. Still a solid tone. He widened the hole some more so he could get his coil in, and here's the key and the lesson in this story, he got a strong signal off the side of the hole, about six inches down, but set back another inch into the side of the bedrock!!

My unlucky friend, the true discoverer of the gorgeous nugget's resting place had gone deep past the signal while digging his hole!!

Now, of course, a good pinpointer would easily solve this problem. The problem was, my buddy didn't have one, so why would he widen the hole, right? Well, the other guy was the one with more experience, and that's why he did. It was a lot more work, but what a payoff!

So, my buddy's butt is still black and blue from where he kicked himself for the next week or so for having lost such an incredible prize.

Some nugget hunting lessons are harder than others to learn. . . .

All the best,

Lanny


P.S. When in gold country--check the bedrock, regardless of whether it looks likely or not! Mother Nature likes to play games sometimes.

 

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Upvote 8
Thank you Jim for the Birthday greetings for this coming Friday, I am looking very forward to the day. I've nothing particular planned, just looking forward to being that number.

I've had two Complete Physicals in the past 20 years and both results were Nothing is wrong, keep doing what you are doing and come back in 10 years or so.

My concern is the shoulder operation so staying fit is the best thing I can do for myself as well as to loose that nagging 18 pounds I have hanging around. I do floor exercises and will add my bicycle trainer routine very soon and with my stretching exercises I will have a well rounded physical fitness program. As soon as the shoulder tells me it is strong enough then I will add a weight set to the program. I simply refuse to let go of my ability to be out there even if I live a long distance from "out there".

I need to give this job a good two years to see if it will pan out (what a wonderful phrase) and we will reorganize as needed. It would be good to stay the five years here just to have the student loans paid off and be "free" again!! Time will tell.

For now the exercising and motorcycle rides will have to fill a lot of the void I'm in here. Possibly joining a rod and gun club would also help and checking out the "hill country" of Texas. Need a Motorcycle GPS for the bike as the one for the Bronco is NOT waterproof and there is not a mount for it for use on a bike.

Again, that is a very nice chunk of silver of the Plate Type!

All my best to ya Jim, 63bkpkr/Herb
 

63bkpkr, (Herb),

Happy Birthday Brother!!!

Only seven more years and you will catch up to me!

Uhh, wait, in seven years I'll be 84. Sorry Brother, you can run as fast as you can, but you'll never catch up.

Take care and enjoy life to its fullest!! Even Obama will just be a memory some day. (lol)

Love and Respect,

Eagle
 

Eagle I will never catch up to you though some day I will be the age you once were. It has been a nice day and it is going to be a nice evening. All my best wishes to everyone everywhere Just Because! 63bkpkr
 

Jim I happen to have a small rock which is magnetic (picture attached). It has a good strong magnetic pull on one end & about medium on the other. If you are interested I can just send it to you for your testing..Just PM me your address ( I see you are in Canada which makes it easier for shipping)........

I've done some testing here in the back yard with both the Tesoro Vaquero & Lobo Super Traq with these magnetic rocks, a gold nugget ( I've had this nugget for some time now ) a coin and a small knife. I realize that when I go the claims and the mineralized ground the results may be some what different..But here is what I have learned......

The Vaquero had a strong consistent same sound to all of the items..

The Lobo Super Traq had to me had different sounds to the different items. The coin & knife was a sharp, crisp screaming Zing, the magnetic rock was a lower tone Zing around 4 inches and after about 40 seconds the Lobo would not pick up any tones from the magnetic rock even at 2 inch distance.... The gold nugget had not only great depth (about 10 inches) but had a distinct more mellow drawn out Ziinnnnng tone......


View attachment 975906View attachment 975907

Hello Caribou5… I’ve had a chance to look at the two hotrocks you sent me recently. Both are fairly magnetite rich… not nearly so powerful as a similar size relatively pure magnetite sample… but both are modestly attracted to my pick magnet, produce a magnetic susceptible readout near maximum, and both ground balance on the F75 at GB89… well into the magnetite GB range on this unit.

Over most ground encountered in mining country here in Ontario, these rocks will produce a negative “boing” type of hotrock response. The hotrocks’ GB compensation point in most areas will be measurably above that of the surrounding terrain. By contrast, over areas or beds of mafics such as concentrated diabase in mining tailings, basalts, or black sands for example, these hotrocks likely would not produce a signal.

Whether an iron-mineralized rock responds with either a positive or negative signal depends on its GB compensation point (ground phase) and magnetic susceptibility characteristics compared to that of the substrate to which your detector is properly ground-balanced. For example a rock exhibiting substantive magnetic susceptibility and a relatively lower GB comp point would produce a solid positive hotrock signal in typical mining country ground conditions.

This is what I suspect Lanny has experienced and described a page or two earlier on this thread. Such can / will react sharply as positive hotrocks to a VLF unit, and these may even react with a signal to a PI unit that has been properly ground-balanced to the local terrain … particularly if maghemite is the primary non-conductive iron oxide mineralization within a hotrock.

It is raining out this afternoon / evening so I haven’t bothered to test the rocks outside on the ground. I have no doubt either will produce a modest negative signal when placed on this ground.@ GB86 and Fe3O4 @ 0.3% equivalent magnetite with the 10” elliptical concentric coil attached. Will check it tomorrow just to be certain. Many thanks Dave!!! :icon_thumleft:

Jim.
 

Well Herb... this may or not be exactly anyone’s taste in muzik, but I thought it was appropriate for your birthday today. Frankly I just love it and hope you will too!!!

HAPPY B’DAY YOUNG MAN!!! :occasion13:



Jim.
 

Jim,
What a memorable pleasure to be bouncing around to! That is truly a "Sassy Golden Nugget" of a memory of a gentler time at least for me and thank you for posting. It is a nice adder to my 70th birthday! What else happened on my birthday well, I had people at work singing happy birthday to me in several different departments and locations and two dear ladies came up and gave me a hug. A truly memorable day filled with the best of human kindness and sharing!

Thanks all, Herb
 

"Many thanks Dave!!!
icon_thumleft.gif


Jim."


Your very welcome Jim. Your comments on the response of the hot rocks will be taken with me when I get a chance to get out on the claims to test and see what reactions I encounter in my area. I can't end this post with saying "Thank You Very Much" for the beautiful raw silver ore samples you sent. Totally unexpected but greatly appreciated. I have one shelf that is for special rocks, ores etc and this is where your samples will reside......Again thanks Jim & all the best....


And to Herb......HB, it's your day.....have a good one..
 

It is raining out this afternoon / evening so I haven’t bothered to test the rocks outside on the ground. I have no doubt either will produce a modest negative signal when placed on this ground.@ GB86 and Fe3O4 @ 0.3% equivalent magnetite with the 10” elliptical concentric coil attached. Will check it tomorrow just to be certain. Many thanks Dave!!! :icon_thumleft:

Jim.

Hi Dave... I tested both these hotrock samples outside in the backyard. Both produced a modest but quite distinct negative "boing" hotrock signal in the all-metal motion mode. Thought I'd pass that along just to wrap things up.

Jim.
 

One last comment Dave. When I describe a signal as a negative "boing" hotrock signal, please have a look at the video below to see exactly what I mean by that description. I highly recommend this video to anyone unsure about detector signals. The individual demonstrating the Whites GMT is a no-nonsense, highly successful metal detectorist, and he has earned an unassailable reputation in the business / hobby.



Jim.
 

Wow! Lots has been happening since I've been gone; I'll have to take a few days and get caught up.

It was nice to get away for a while and visit some place warm.

However, it's finally starting to warm up here too, so I should be able to get in a little prospecting soon.

All the best,

Lanny
 

I check this thread about every day. It seems that something got screwed up. The thread went from 88 pages to 117 overnight.

If you go to page 88, it has posts from a year ago. Yesterday, page 88 had current posts.

It's not the first time. As I read through the thread a few months ago, there were sections that were a repeat of things I had already read. Many pages worth.

It seems like some pointer got screwed up in the forum software.

It's still worth the time to read it all though......I've learned a lot.
 

One last comment Dave. When I describe a signal as a negative "boing" hotrock signal, please have a look at the video below to see exactly what I mean by that description. I highly recommend this video to anyone unsure about detector signals. The individual demonstrating the Whites GMT is a no-nonsense, highly successful metal detectorist, and he has earned an unassailable reputation in the business / hobby.



Jim.



Very helpful thanks Jim. I still have about 2 weeks to wait as there is 2 to 2 1/2 feet of snow on the new claims. This will be my first year using a detector for gold nuggets and with all the tips & info from Lanny, yourself & others I already have a good idea what to expect and what to do should I encounter hot rocks...:thumbsup:
 

Dave... geez it must have been a long hard winter out your way too. Here it is the start of May and you've got that much snow on the ground!!!

You might want to glue a small lead "nugget" to a poker chip or whatever, so that occasionally you can use it to calibrate your detector for acquiring the best possible signal, and to remind yourself exactly how a small "nugget" should sound compared to other signals produced by rocks and other ground minerals

It might make an instructive follow-up to this discussion if you could describe some target signals encountered on your claims, what were the targets that produced 'em, and maybe even add a few photos showing such recovered targets and the search conditions generally.

Just a few ideas Dave... all the very best this season on your claims. Good luck and good hunting!!! :icon_thumleft:

Jim.
 

Jim this year seems brutal with the amount of snow we got. Just 25 miles from my new claims the boys I know have 3 feet of snow on their claims they are plowing out and building new roads at this time. All through this area the miners are starting to get ready for the season.

I have an assortment of items I will be taking along to get a good feel for the hopefully different tones in the mineralized ground, however this will not be for a while as I have to get all the exploration work done first and sent in. After that I will add to this post on the results I was able to determine and what I found..
 

I have an assortment of items I will be taking along to get a good feel for the hopefully different tones in the mineralized ground, however this will not be for a while as I have to get all the exploration work done first and sent in. After that I will add to this post on the results I was able to determine and what I found..

Dave... I will look forward to hearing more from you about your claim work and related detecting results at such time as you are able to report back to us. Meanwhile if any questions occur to you, or should there be anything you wish to discuss about minerals and how they relate to metal detectors... don't hesitate to post anything that comes to mind right to this thread... I'll be sure to see it. Otherwise feel free to PM me at any time.

Again... all the very best with everything out at the claims. :thumbsup:

Jim.
 

Bejay has been posting some excellent information over on the Prospecting forum. As I was looking through some of his video links, I came across this one.

This video sure makes me miss dredging!

This is an excellent video on the dredging process and how the dredging operation works. It's also a great video to explain and show how dredging simply takes the original stream materials and then redeposits them back in the stream where they already were--very low to no impact mining.



All the best, and I hope you enjoy watching it as much as I did,

Lanny
 

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Jim,
What a memorable pleasure to be bouncing around to! That is truly a "Sassy Golden Nugget" of a memory of a gentler time at least for me and thank you for posting. It is a nice adder to my 70th birthday! What else happened on my birthday well, I had people at work singing happy birthday to me in several different departments and locations and two dear ladies came up and gave me a hug. A truly memorable day filled with the best of human kindness and sharing!

Thanks all, Herb

So sorry I missed your birthday Herb! It was great talking to you on the phone the other day though.

I hope you'll get a chance to chase a little sassy gold this summer.

All the best,

Lanny
 

Jim this year seems brutal with the amount of snow we got. Just 25 miles from my new claims the boys I know have 3 feet of snow on their claims they are plowing out and building new roads at this time. All through this area the miners are starting to get ready for the season.

I have an assortment of items I will be taking along to get a good feel for the hopefully different tones in the mineralized ground, however this will not be for a while as I have to get all the exploration work done first and sent in. After that I will add to this post on the results I was able to determine and what I found..

I hope you have a great season on your claims, and I hope you learn how to find some fine nuggets with your detector.

I've been spending quite a bit of time going over my machines, and rereading the manuals. It's amazing how much more I pick up, or realize I've missed, each time I go through the manuals again.

Well, I wish you all the best this season, and drop in from time to time and post some pictures of that gorgeous Cariboo gold.

All the best,

Lanny
 

Dave... I will look forward to hearing more from you about your claim work and related detecting results at such time as you are able to report back to us. Meanwhile if any questions occur to you, or should there be anything you wish to discuss about minerals and how they relate to metal detectors... don't hesitate to post anything that comes to mind right to this thread... I'll be sure to see it. Otherwise feel free to PM me at any time.

Again... all the very best with everything out at the claims. :thumbsup:

Jim.

Jim,

I see you've been extra busy in my absence keeping things moving along on this thread. Thanks for your input and as always, I see that you're dispensing solid gold advice as well.

I'm sure you've forgotten more about detecting than I'll ever know, and I take my hat off to you as a true dedicated and earnest devotee of all that makes up all things related to metal detecting,

Lanny
 

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