detecting ancient gravels at hydraulic mine

[tnr3]

Does anyone have any experience detecting at old hydraulic mines?. I have a gb2, and it is kinda difficult to detect there. there is alot of hot rocks. I've tried running on high mineralization, iron dis, and lowered the sensitivity, but still alot of hot rocks, some are only the size of a quarter, but the scream even on iron disc. there was alot of fine gold there, so I have been using the 6 1/2 inch coil. any tips or advice would be great.
Thanks
tnr

 

[XT18000]

I hunted quite a few in Calif. while I lived there; great hunting sometimes. Try around the
outside of the area ( fringe ). They blasted alot of the small stuff plum out of the main
work area with those cannon's plus everyone else with a detector that had a chance has
all ready hit them. Make sure the area is NOT UNDER CLAIM befor detecting there.
GB dead on and sweep slow and low.

HH

 

[David]

Maybe get a Garrett Infinium LS or Whites TDI as they handle-eliminate hotrocks MUCH better. Otherwise use VLF's in discriminate mode high enough to knock out hot rocks. You can also try balancing out directly on a hotrock with your Manual GB dial. Go on Steve Herschbach's(from Alaska) website for advice on this subject.

 

[tnr3]

thanks david and xt.

this hydraulic mine is never been detected, this property has been very private for over 100 years, I tried panning a few places in the ancient gravels, but didn't really find any color, they did quite well hydraulic mining and later with the bucketline dredge. you can look it up it was called hardscrabble mine in igo ca. or look up piety hill, this is the towns old name. it was mostly small gold, that is why I was using the small coil. they only worked 26 acres out of 1700 before the hydro ban in cali in 1884.
thanks
Todd