Gold Hill cemetery

I was walking in the cemetery one day with an EMF reader and I was getting some fairly high readings. After a while I got used to it and thought nothing of it, until I reached a unmarked grave there we w headstone but there were no engravings on it. I looked down at the EMF reader and it read a 3.87. Which is very high considering the most I have ever got off a EMF reader previous to this was a .15. And the most unusual part to this... Was there were no power lines any wear near where I got the readings. After the few short second of seeing the reading there were no other unusual spikes. This cemetery is right off old stage road. This cemetery is from the early to late 1800's. It is an old cowboy cemetery.