Jump to content

Recommended Posts

20 minutes ago, Gold Catcher said:

 The amount of trash I usually collect in hydraulic pits is mind-boggling.

In my limited experience and areas, I find hydraulic areas have less trash than the river bottoms where the dredges operated....

  • Like 2
Link to post
Share on other sites

7 minutes ago, oneguy said:

In my limited experience and areas, I find hydraulic areas have less trash than the river bottoms where the dredges operated....

Yeah I am not going there at all with a metal detector 🤪

Link to post
Share on other sites

 Caught me a tertiary trout one time. If your going to prospect the Sierras the above mentioned publications are the place to start. Here is a little secret, but don't tell anyone. These ancient channels were fed by smaller tributaries the same as today's rivers. Some of these are not covered by immense depths of andesite and mud flows and can be very productive.

 I have my own theories about the age and processes by which these channels were formed but what do I know.

  • Like 4
Link to post
Share on other sites
1 hour ago, klunker said:

Here is a little secret, but don't tell anyone.

Just tell me the GPS coordinates. And don't worry, I won't tell anyone 😉

  • Haha 1
Link to post
Share on other sites
1 hour ago, klunker said:

 I have my own theories about the age and processes by which these channels were formed but what do I know.

I'm interested in hearing them.

  • Like 1
Link to post
Share on other sites

Ive been deep in a buried "ancient" river mine where you can pick the drift wood out of the  ceiling.   Its still good wood, though a bit mushy.   I also have my own theories...

  • Like 1
Link to post
Share on other sites

Here are a few additional references on ancient Tertiary river channels that provide a little additional insight.

Malakoff Diggins State Historic Park

https://www.conservation.ca.gov/cgs/Documents/Publications/Special-Reports/SR_230-GeoGems-Notes-LR/CGS_SR230_MalakoffDiggins_SHP_lr.pdf

 

South Yuba River State Park

https://www.conservation.ca.gov/cgs/Documents/Publications/Special-Reports/SR_230-GeoGems-Notes-LR/CGS_SR230_SouthYubaRiver_SP_lr.pdf

 

The old river beds in California by LeConte (1879)

http://minerdiggins.com/Ripple/Library/LeConte1879Rivers.pdf

 

Nevada Bureau of Mines and Geology poster on ancient river channels

https://nbmg.unr.edu/Staff/GarsideL/GarsideL_poster.pdf

 

Prospecting Old Tertiary Channels by Chris Ralph

Prospecting Old Tertiary Channels - September 2010 (Vol. 80, No. 1) - ICMJ's Prospecting and Mining Journal

 

Unravelling the paleotopography and extent of Eocene-Oligocene gravel deposition of the ancient Serran drainage systems; A Master’s Thesis by Christina Marie Tipp 2017

https://scholarworks.sjsu.edu/cgi/viewcontent.cgi?referer=https://www.startpage.com/&httpsredir=1&article=8411&context=etd_theses

Link to post
Share on other sites

Does the name Stan Grist ring a bell with anyone?   I don't know if he was legit or not but he a gold coarse if I remember right.  He had maps showing  Ancient River channels from Canada to somewhere in South America.

 

 

 

Link to post
Share on other sites

I ran into various old relics of the course this Stan Grist was selling when I was searching for another detectorist who seems to be lost to history and I never located named Chet Long (not the Chet that posts here, I asked :smile:). I seem to remember seeing Grist ads in magazines or maybe online when I first started detecting for gold too.

Sure wish some of these guys would have shared more knowledge on the forums.

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Similar Content

    • By Libertas
      Interesting! Will be useful when we eventually have a colony there.
       
    • By Dances With Doves
      I only  went real nugget hunting one time in Stanton,Arizona in march 2002 because the late Charlie Wilson of Wilson metal   detectors took us as guests for a week.I was   using a Minelab gold machine he lent me that ran at 3  different freq.You had to choose one.I really envy you guys that get to do this in your area.I loved doing it even though I found no gold since i was  new at this type of hunting.The owner of the   Johnson mine even gave us permission to hunt his land which I thank him for.I  met Chris  Gholson and his  father and they were fantastic people.  
    • By mn90403
      So what caused it to break away?  Here is more on that theory.
       
      https://www.sciencemag.org/news/2021/03/remains-impact-created-moon-may-lie-deep-within-earth 
    • By Steve Herschbach
      The earth has been warming and glaciers retreating for over 15,000 years. Almost everything in the part of Alaska I lived in was recently exposed by glaciers and been prospected the last couple hundred years. Glaciers are nature's bulldozers and they destroy and mix. The gold distribution in glacial material is generally random and sparse. Where water has had time to work glacial deposits new placers can form, but the short geologic time spans we are talking about usually mean small erratic deposits. The good news is that also means you can maybe find a gold nugget just about anywhere in glacial material.

      If you watch the video a second time and pay attention to the area that becomes Alaska you will see that Anchorage, on the southern coast, was buried under 3000 feet of ice not too long ago. The interesting part is northern Alaska is largely ice free. This is extremely important. The placers are much older and more extensive in Interior Alaska than in the southern coastal areas.

      The northern US was heavily glaciated and much of the material was pushed down from out of the north in Canada. I find glacial terrain interesting because glaciers have melt water running under them and along the edges, which form small oddball placers in the strangest places, and other placers are possible in the large outwash areas.

      I am discovering there was a lot more glacial activity in the Sierras than I would have imagined and so this is still very relevant for me prospecting in California.

      These links may not be for your exact area but all contain good information about glacial geology and prospecting.

      Great freebie article Gold in Kansas

      And a small related article at the ICMJ Undiscovered Placer Deposits in Alaska

      Really good stuff starting page 117 on Gold Placers of Colorado

      Placer Deposits of the Yukon

      Geology of Tertiary and Quaternary Gold-Bearing Placers in the Cariboo Region, BC

      Here is some really technical stuff for those so inclined Glacial Geology & Prospecting

      Glaciers of California

      A much more prospector friendly version can be had in an excellent but pricey book by Chuck Lassiter, Midwest Gold Prospecting at http://www.midwestprospector.com/book.html

      I have a copy in my library of the best of the best. It is a high quality book with color maps and illustrations and a no-brainer at about half the cost. For $29.95 you have to just love books as much as me as that is as much as the Chris Ralph encyclopedia and this book would be a chapter in Chris book. That said, I have never seen the particular subject of glacial region prospecting covered better and more understandably anywhere else. It would be the go to primer for anyone interested in the subject.
       

    • By Allen M
      Hello, 
       
      I was out this past weekend with my Gold Monster 1000. Here is a picture of a rock that I came across that had crystals and what I believe is black sand. I have come across black sand by it self and has done the same issue with my machine. Reading and sounding hot and then a blank sound as well. 
      1) I assume that you can find black sand like this still in a rock with Quartz.
      2) Is is not true that usally when you find black sand you may end off finding gold as well because black sand and gold go together. 
       
      here are four pictures of the rock.
       
      Allen
       




    • By nebulanoodle
      I nabbed a pretty neat find the other day and I think it was sunbaker...
      Is it only a sunbaker if you saw it before you disturbed it or is it still a sunbaker if the rock that it's lodged in tells a sunbaker tale? Every dirt dog can tell what half of a float rock was in the ground and what half was face up. 
      This is a rock with a nugget lodged in it that tells one of those sunbaker tales. 
      Is it a sunbaker?
      -OR-
      Was it a sunbaker?
      -...OR-
      Is it not a sunbaker?

      It's wedged in there really good! I haven't tried to yank it out because it's so unique as a sort of specimen of a bedrock nugget trap. I've picked at it and got no movement, plus it survived getting tossed around in my pack on my hike.
      An interesting find too! One of those days, patch hunting a new area (this new area hasn't met the three nugget threshold). All I had in my pocket was trash and my nug jug only held my test nugget. But lo, another signal! Few and far between, they are out here. Giving the spot a boot scrape moves my target. Probably surface trash, a bullet. Gotta know. These 4 rocks. These 3. These 2. That one... it's not a hot rock? Turned in hand to reveal a little smooshie stuck in a crack! WHOA!!!
      My strongest theory is that this "specimen" is a remnant of the bedrock that trapped some gold, all the bedrock having been eroded away. The gold since washed down the hillside and into the main drainage, perhaps all the way into the basin... But hopefully it has only travelled just past where I stopped detecting for the day and I get a whopper bonanza another day! 😂 Yeah right.
×
×
  • Create New...