On Page 19 of the Explorer SE Manual for desired coins it states this:

[Tony N (Michigan)]

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Notice it states that the desired high-ferrous target is a Canadian coin.

If I am finding silver American coins, are they not desired as a high-ferrous target? Should I be tossing them out?

Of course this is all to be taken in jest. Just to brighten up your day a bit.

 

[Dan-Pa.]

In the U.S. coins fall in a general area, but in Canada they can be found all over the meter as some have ferrous mettalic makeup, now if one is in England the range of coins are perhaps hundreds and thousands of year old and one never knows where a coin will be found so most dig if it beeps and appears small...

 

[Rick(ND)]

Tony,

Silver US coins are not high ferrous coin, they are low ferrous. The silver Canadian coins also are low ferrous coins, but the new quarter, dimes and some of the nickles are high ferrous coins. What the book is saying that some of the desired high ferrous targets are Canadian newer coins while a undesirable high ferrous target would be a nail.
If you notice is you don't dig much of the newer Canadian coins unless you are digging ferrous target too, so most of the coin patterns many make they will be rejecting the Canadian coins, I think they are made of a stainless steel or something similar as they will stick to a magnet.

 

[Tony N (Michigan)]

Man, I'm glad I live in the United States.

I wish we'd make our coins our of real silver, gold and copper again. It simplifies detecting.

 

[Tony N (Michigan)]

Rick for some reason I was thinking Conductivity for coins. Thanks. I guess the joke is on me.