A
Anonymous
Guest
Hi All,
Boy what a couple of months do to a forum. In November, Chris Hakey posted an interesting theory concerning the lateral dissipation of the transmitted signal of his PI in red clay.
Since then we have seen some very informative theories and explanations as to why this may occur as well as a lot of in depth detector theory. One such posting, by Dave Johnson introduced the problems due to the ionic conditions that occur in clays.
This posting as well as some of the other more recent postings of detector theory sent me scrambling for more information on the subject.
I have been scouring the web to see if there was any technical infomation pertaining to the problems and theories recently mentioned. Surprisingly there is and much of it is very informative. Some information is quite technical while other information does transform theories into more readable information.
Rather than try to copy the information, I will add a website that seems to add credence to Hakey's hypothesis. See:http://www.usace.army.mil/inet/usace-docs/eng-manuals/em1110-1-1802/toc.htm, primarily chapter 4 pages 39 through 42.
Other articles I have stumbled onto do refer to the induced polarization as discussed by Dave Johnson. This information similar in nature to the above posting does discuss the ionic behavior. Other information discussed in resistive measurements refers to ground freezing can reduce the ionic effects. Makes sense to me and does answer questions as to why one may obtain different depths in frozen ground.
Still other sites refer to the density factor of clay and its resistivity as being reasons for loss of depth and discuss it in more mathimatical terms.
So it seems that mother played a nice trick on the serious nugget hunter by her precious gold nuggets in the most hostile of ground conditions. This hostility appears to be most severe to electromagnetic detection.
Here are a couple of more sites with relevant information. Have fun reading.
Reg
http://www.seg.org/publications/geoarchive/1993/mar/geo5803r0326.pdf
http://www.earth.monash.edu.au/~jcull/galvanic/
P.S. Chris Hake, you should have been an engineer, you have an very intuitive mind.
Boy what a couple of months do to a forum. In November, Chris Hakey posted an interesting theory concerning the lateral dissipation of the transmitted signal of his PI in red clay.
Since then we have seen some very informative theories and explanations as to why this may occur as well as a lot of in depth detector theory. One such posting, by Dave Johnson introduced the problems due to the ionic conditions that occur in clays.
This posting as well as some of the other more recent postings of detector theory sent me scrambling for more information on the subject.
I have been scouring the web to see if there was any technical infomation pertaining to the problems and theories recently mentioned. Surprisingly there is and much of it is very informative. Some information is quite technical while other information does transform theories into more readable information.
Rather than try to copy the information, I will add a website that seems to add credence to Hakey's hypothesis. See:http://www.usace.army.mil/inet/usace-docs/eng-manuals/em1110-1-1802/toc.htm, primarily chapter 4 pages 39 through 42.
Other articles I have stumbled onto do refer to the induced polarization as discussed by Dave Johnson. This information similar in nature to the above posting does discuss the ionic behavior. Other information discussed in resistive measurements refers to ground freezing can reduce the ionic effects. Makes sense to me and does answer questions as to why one may obtain different depths in frozen ground.
Still other sites refer to the density factor of clay and its resistivity as being reasons for loss of depth and discuss it in more mathimatical terms.
So it seems that mother played a nice trick on the serious nugget hunter by her precious gold nuggets in the most hostile of ground conditions. This hostility appears to be most severe to electromagnetic detection.
Here are a couple of more sites with relevant information. Have fun reading.
Reg
http://www.seg.org/publications/geoarchive/1993/mar/geo5803r0326.pdf
http://www.earth.monash.edu.au/~jcull/galvanic/
P.S. Chris Hake, you should have been an engineer, you have an very intuitive mind.