Jump to content

Gold Detecting And Prospecting Forum Was Discussing On Or Off Topic Gold Topics


geof_junk

Recommended Posts

So I thought I would throw a spanner into the discussion. Here goes.

We have heard of the double D coils what about a triple D coil. Well that outside my knowledge but let look at a quad D coil the oldest ground balancing coil. Have a look at these links.

....LINK....
https://www.phys.k-state.edu/reu2011/nnorvell/Metal_Detector_Research.html

and more detail.

....LINK....
http://41.67.20.41/bitstream/handle/123456789/18621/Metal%20Detector.pdf?sequence=1&isAllowed=y

Are we on topic.

_________________
Regards Geof.
geof_junk
geof_junk
Contributor Plus
Contributor Plus
 
Number of posts : 794
Location : Gippsland Australia
Registration date : 2008-11-11
 
View user profile Send private message Send e-mail
 
 
Link to comment
Share on other sites


Geof:  Interesting question and interesting first article.  I personally have never read of anyone making a 4-D coil  so I am curious if such a configuration has been investigated and if so what were the results?  I was unable to access the second link.  Thanks for posting an intellectually stimulating question.

Link to comment
Share on other sites

1 hour ago, Cascade Steven said:

Geof:  Interesting question and interesting first article.  I personally have never read of anyone making a 4-D coil  so I am curious if such a configuration has been investigated and if so what were the results?  I was unable to access the second link.  Thanks for posting an intellectually stimulating question.

The site has some problems...... It was a good write up on coils in the preamble I got ¾ of the way though it. I will try and get on it again when the site get back up as it had a lot of technical details in it over 40 pages.  The site error listed below.

This site can’t be reached

41.67.20.41 took too long to respond.

Link to comment
Share on other sites

My first post here, coil-related, so I hope it's not too off topic. Two more spanners...

First off I hunt residual gold mostly, not transported alluvial stuff and until I started nugget hunting a lot two years back I always thought that the term "gold patch" was just that, a term. To my surprise I've found that nuggets cluster really tightly. Although the district is a few square miles patches are no more than a hundred square yards with a whole lot of nothing between patches. So I tend to visit a patch multiple times. 1st pass-discovery, 2nd pass- move all the rocks, 3rd pass buy a PI and try again!

 Question 1 Is there a really thorough article somewhere on using no-motion mode? Both Garret and Fisher kinda cough and shuffle their feet on the subject saying it's best left to experienced users. Well, thanks guys that's real helpful! 

Question 2 (Full disclosure - I was an exploration geologist for many years and came up against EM systems) Has anybody ever used a relatively large, fixed transmitter loop and a roving receiver for nuggets in known patches where the soil profile is way, way thicker than even a GPZ's range. It's a standard technique in metals exploration and the large tranmitter and the ability to put more current through it would seem a no-brainer to get more depth in great patches that have been hammered?

BTW I really enjoy this site and the discussions on it. Thanks.

  • Like 4
Link to comment
Share on other sites

  • The title was changed to Gold Detecting And Prospecting Forum Was Discussing On Or Off Topic Gold Topics.

 Question 1 Is there a really thorough article somewhere on using no-motion mode? Both Garret and Fisher kinda cough and shuffle their feet on the subject saying it's best left to experienced users. Well, thanks guys that's real helpful! 

None that I have seen. There would not be much to write about. Non-motion mode simply lacks an SAT function, so you have to be on top on the manual tuning. That’s it in a nutshell.

Question 2 (Full disclosure - I was an exploration geologist for many years and came up against EM systems) Has anybody ever used a relatively large, fixed transmitter loop and a roving receiver for nuggets in known patches where the soil profile is way, way thicker than even a GPZ's range. It's a standard technique in metals exploration and the large tranmitter and the ability to put more current through it would seem a no-brainer to get more depth in great patches that have been hammered?

Tow Coils

Max Depth

  • Like 1
Link to comment
Share on other sites

Steve

Thanks for the links. I liked the tow coil post. Basically an airborne system flying at zero feet! My ground is too rugged for that but I recall that an early base metal EM system had the operator wearing a 5-6 foot coil like a giant hula hoop. One for the back-burner....

Next trip I'll blow the dust off my GB Mk1 for which I have a 14" aftermarket coil, pay attention to ground balance and give no-motion a shot over a hammered patch.

  • Like 1
Link to comment
Share on other sites

  • The title was changed to Gold Detecting And Prospecting Forum Was Discussing On Or Off Topic Gold Topics

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
×
×
  • Create New...