Concentric or DD for black sand tracking

[Lonetree]

On my Omega which coil will be best for tracking the black sand in a stream? Any pointers on how best to do this? Ya, I like looking for gold. Think this may help narrow down area to look in on creek.

Jim

 

[Monte]

There are a couple of river beaches I like to work just to isolate black sand pockets for panning and such and I found both coils worked okay. Honestly, I preferred the elliptical concentric coil for that task at each of the sites.

Monte

 

[Lonetree]

Monte,

Thanks for the reply. I seen on the gold fever show when he went to garret that they said a DD coil helps filter out high mineralized soil. I found it on the DVR yesterday. Have any pointers on tracking it with the O8?

 

[rockpup1]

I would use a concentric coil in all-metal mode.Your looking for High Iron readouts on the machine-I see the omega has a ground readout,I am guessing the higher the number the more iron in the soil?I know you can use the ground readout on a mxt to find black sand streaks.I myself have a bag of black sand to set my machine up with.I dont like my machiens for this purpose and am getting a GMT-its has a feature for this.

I been told that old BFO machines work Very well for this.

 

[Dave J.]

For tracking black sand streaks, you can do it with any searchcoil but a concentric will give more repeatable measurements.

The Fe3O4 bargraph on several Teknetics and Fisher models measures the black sand concentration. The ground balance number will vary with black sand concentration but in and of itself does not indicate the amount of black sand, only the ratio of black sand to more magnetically lossy iron minerals and conductive salts.

--Dave J.