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I am a geologist, and I use geologic maps frequently. What I look for is the type of outcrops. Generally, volcanic or intrusive rocks are more mineralized than metamorphic or sedimentary rocks. To put it in laymans terms, limestone, shale, sandstone, quartzite, marble, and dolomite are usually mild, while granite, andesite, diorite, basalt, gabbro, seyenite, etc. are often more mineralized. The U
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
Contrary to popular belief, minting of 90% silver coins was not discontinued after 1964. In an effort to curb hoarding, 90% silver (1964-dated) and clad coins were minted concurrently into 1966. The last 90% silver quarters were minted in January 1966, the last dimes in February, and the last halves in April. This may explain the presence of silver coins in the spill along side 1966 clad coins.
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
This is a very interesting topic that I have enjoyed following. I do not post much, but recently I heard a news story on the radio that caused a light bulb to go on, so I decided to post. The story was about the rapidly expanding field of data analysis. New digital technologies have resulted in a flood of data that is so immense that it is impossible to process manually. One of the examples given
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
Thanks Lytle78 for the quick reply. Interesting about the Tripitz. I just watched a documentary on the sinking of the Bismarck.
I guess what I was getting at in my question was if something like a rusty can could be penetrated by the transmit signal to even make it to a ring, and if so, could the return signal make it back through the can to the detector? In the tests that I have seen, there i
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
Question for Denis or Alexandre. Is the zero masking true if say a gold ring is 100% covered by iron? For instance a gold ring beneath a smashed rusty can or a rusty bottle cap? In all metal is it possible to distinguish a nonferrous target beneath nails or do you get the double blip from the iron in all cases?
Thank you for taking metal detector technology to the next level.
Kent
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
I bought a V3i in about 2012. I used it mainly in all metal mode using the target ID to discriminate. I found this to be better in trash than using the discrimination modes.
I consider the depth to be a bit mediocre, at least in my soil. I had the best luck with the SEF soils. My favorite is the 12x15, which adds a good 2 inches over the stock 10" double D. I have since moved on to the Nox
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
First detector was a toy purchased with green stamps in 1975. It could find coins at 2-3 inches or so. Second detector was a White's 5000-D in 1976 or 77. I was in Junior High School and paid about $150 for it using money earned mowing lawns, and working odd jobs. Took a long time to save up $150.
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
Calibrating the depth curve to the measured 47" after 365 years, I come up with a depth to bedrock/hardpan/sand etc. of 60 inches.1653 Sink Rate. Of course this assumes that the site is not in a sediment depositional or erosional area (next to a stream or other body of water).
Kent
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
I come up with about 1.3" per decade, which is slower than what Darwin calculated for England (2.4"/decade). However, Darwin's rate was calculated over a much shorter period. The sink rate should decrease with depth (and time) due to the greater earthworm activity at shallower depth. Very interesting Tom. Please keep us posted on the recoveries.
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
I have been following this thread with great interest, but so far have not joined in. For all of you electronics experts I would like to pose a question regarding the inclusion of both single frequencies and multi-frequency in the Nox. I wonder if this would be useful for identifying bottle caps? The FBS technology with the 2D screens are great at this, but a 1D screen would seem to have less abi
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
NASA-Tom and other have brought up the issue of coin size, which affects our ability to detect small items such as gold dollars. However, as also pointed out, small items tend to be lost more easily and are less likely to be noticed right away after being lost. The large number of gold dollars found at Camp Floyd (58) seems to bear this out. The Bylund book provides a good sample of the gold coin
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
I am just about ready to post the results of my database. Thank you to all who contributed. Tom, I will discuss the size issue that you bring up. Good point. I have some data on gold coin loss rate vs size that you all might find interesting.
I also will include population data (then and now). Despite less circulation of gold coins in the East, the population was higher back east and there we
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
Thank you much Tom! I will add these in. Also, I came to the same conclusions that you did when compiling the database. No jewelry and no caches. Gold coin jewelry was a fad in the 1950s.
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
Tom,
Please submit whatever you feel comfortable with either here or by PM. Feel free to leave out site types for some if you need to. There are plenty of holes in the data I have. Currently I have 270 coins in the database, but 104 of them are from Bylund's book on Camp Floyd, which kind of skews the data set. I have included all of the banner finds. The question of mint marks is another
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
Tom_in_CA
Your theory about travelers taking along coin makes some sense. I copied this from the Daily Alta California, Volume 84, Number 136, 16 May 1891 regarding the Donner Party.
DONNER PARTY RELICS.
Discovery of Money Buried by Some
of the Ill-Fated Pioneers.
Two Prospectors Unearth Many
Old Silver Coins.
Truckee, May 15th.— Truckee is feverish with excitement over the d
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
Tom_in_CA, your observations make perfect sense based on my research. As I mentioned in my post, California has always had a love for hard currency. In 1862 when most of the rest of the country was resigned to the fact that greenbacks would be “money” from then on, California absolutely refused to accept paper money of any kind, even the government sanctioned greenback. California passed a law th
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
Gold Coin Circulation During the Antebellum Period
The period from 1847 through 1861 is the sweet spot for Military sites with potential for a gold coin find. The reason for this was the "Specie Clause" of the Independent Treasury Act of 1846. The specie clause stated;
That on the first day of January, in the year one thousand eight hundred and forty-seven, and thereafter, all du
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
Thank you all for your feedback, input, and kind words. Ozzie and Tom bring up a good points about the earthworm burrowing depth and quality of soil. In Montana it is rare to have top soil deeper than about 12 inches. Below the topsoil is either bedrock or a hard sandy cobble-rich layer which worms cannot penetrate. This limits the burrow depth to 12 inches. Under this scenario the sink rate shou
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
Hi Tom_in_CA,
I know I am responding to this a bit late, but I had the same question when the book came out and decided to do some research to find out. I think I can add to what the others have said. The period from 1847 through 1861 is the sweet spot for Military sites with potential for a gold coin find. The reason for this was the "Specie Clause" of the Independent Treasury Act o
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum
Hello all. I am new to this forum. I think this is my kind of forum, in that the focus is often more technical than many. I have enjoyed reading the threads and have now decided to join and share something that I wrote a couple of years ago on the topic of coin depths. My research seems to fit in nicely with what Tom D. has found on pull tab depths at about 10 inches. I sent himthe article about
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BigSkyGuy
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Thomas Dankowski Metal Detecting Forum