F-70- and gold prospecting

[Steve from Ohio]

I will be out west for a few weeks this coming spring and would like to know if anyone has used the F-70 for gold prospecting?

I know it finds gold rings just fine.

Anyone have any experiences with the F-70 prospecting?

 

[autopilot42]

I have an F5 an have been gathering data on the units ability to detect gold nuggets. So far I have been air testing for what it is worth but I forgot a varialble even in a controlled envirorment, the unit has Hz shift and I have noticed quite a difference with the depth between the 3 freq's does the f70 also have the freq shift and how many Hz does it shift. Freq 1 and 2 seem quite similiar but the 3rd I am loosing quite abit of depth. Does ground balance change even if you are in a "controlled enviorment ie: airtest". My test bed will consist of tailing piles from my high banker and the dessertfox I use in my prospecting hobby so it will be quite mineralized material. My test nuggets are .84gram, .408 gram and .13 gram buy the way I had to borrow these from guy who ran a dredge because I only get dust and really small pickers. I will post my results shortly but does any have an idea about how many Hz these unit shifts.

Thanks Bob

 

[Cal_Cobra]

Bob that's good to know that you observed a depth loss using Freq.3. I haven't had to shift frequencies yet, but good to know.

I did some air tests with some small nuggets and pickers I have and the F5 seems to be pretty sensitive to small gold.

Looking forward to seeing your results.

HH,
Brian

 

[autopilot42]

These are my findings so far for the F5 with mineralized test bed.

13 grain or .84 gram 5 inches

6.3 grain or .408 gram 3 inches

2 grain or .13 gram 1.75 inches

Under ground data the meter was reading three bars most of the time . I am fairly new to metal detecting but keeping gb seems to be the key.

I have an F2 and it airtests well but has a hard time with heavy mineralization, still a great unit.

I am very pleased with the F5's performance. It is full digital detector that you don't have to did thru menus to change anything. It is all at your finger tips with a turn of the knob for most adjustments while you are hunting. Brilliant Interface.

Steve I would think the F70 with the higher freq will do better than the F5. I read a post about the F75 compared to the X70 with the high freq coil and it sounded close so give it a try you are at the same freq as the F75. I think my next purchase will be the F70.


Take care all

Bob

 

[Steve from Ohio]

Thanks for all the info Bob.

I am definitely going to use the F-70 for nugget hunting. That is one reason why I got it.

I do know it is a killer on silver. I've found several silver rings and a few gold rings.

Was out for about an hour this evening and found this 1935 Washington Quarter in a school ground. Also found almost 4 bucks in clads.