How do you handle black sand__idea, need help

[gatorguy]

Does anyone know of the technique to setting the controls or ground balance on a VLF, so when the coil goes over black sand it will null out??? Thanks...Don

 

[BarnacleBill]

you need a dual freq, multi-freq, or PI to handle things well.

BarnacleBill

 

[gatorguy]

Thanks, but I am looking to use out West to ID black sand patches. I know the White's MXT and GMT can do it with their VDI numbers, I am trying to find a way with a regular detector, by doing it this way. Don

 

[Monte]

a fast autotune.

Locate yourself in the area in question and adjust the GB for the 'average' or 'typical' ground at the site.

Hunt in the All Metal mode with a slight audio threshold and, when you hear it null out, you're over more mineralized ground.

I have used this technique for years in western creek, stream and river areas to locate the black sand pockets that I could then pan or sluice or dredge.

Most of the time I have accomplished this with a Tesoro Bandido model or a White's Classic III or IDX Pro that has been modified, or my White's XL Pro or a Troy Custom Shadow X5 ... or some other makes and models that I was using at the time.

Monte

 

[JoeR]

Is it best to use a large coil for this Monte?It would seem that your soil sample would be deeper than with the standard coil.

 

[Monte]

when I am looking along streams for black sand pockets to pan, sluice, high-bank or dredge a lot will depend on the nature of the terrain. If I need to use a 5" to 7" coil to work in and around larger rocks, then that's what I do. Generally, however, I use a 'satandard' coil or something close to that size of the detector I am using.

I'd guess that since I started to use this method about 1977, 90% of the time I have used an 8"-9