FISHER VERSUS GARRETT???

[Bill Smith]

We are in a vertical down shaft about 85 feet below the surface, and we are picking up a detection with a Fisher Gemini 3 between us and 3 foot diameter steel pipe that was sunk hundreds of feet deep vertically in adobe, and possibly some limestone or calcium karst, about 25-30 feet from where we are. We were told that the Gemini could detect through this much material, but if this is the case, we should be able to detect the steel pipe anywhere from the surface to below where we are. (We know that this shaft was sunk hundreds of feet) The assumption is, that since the Gemini can't detect the steel pipe anywhere else, that we must be detecting something between it and us, and we are looking for something that can discriminate between ferrous and non-ferrous materials to try to determine what this before tunneling to it. The concern is that it may be a bomb. What equipment do you suggest that will work in these conditions in the Philippines?

I was ready to fly to Oregon to get a demo from Bob Fitzgerald on his PDF 1000 until I got this note below.....

Hi Bill, This is a "dowsing rod" They have been around for 1000 years. You can do the same with a coat hanger if you can "dowse" It makes me sick to see people get bilked into buying these things , which now go under the phony classification of "long range locators" for lots of $$$. Some even have batteries which serve no function.. Just a good way to make a lot of money from unsuspecting buyers. There should be a law against such things. Nothing
new....best regards, .............

I have since found a Garrett distributor not far from here in Manila who has GTI 2500's for rent and sale, so I am wondering if my best bet is to use my Fisher Gemini 3 on the surface and the Garrett GTI 2500 down in the tunnels?

Any thoughts are greatly appreciated.

Thanks & Best Regards ~

Bill

[Qiaozhi]

We are in a vertical down shaft about 85 feet below the surface, and we are picking up a detection with a Fisher Gemini 3 between us and 3 foot diameter steel pipe that was sunk hundreds of feet deep vertically in adobe, and possibly some limestone or calcium karst, about 25-30 feet from where we are. We were told that the Gemini could detect through this much material, but if this is the case, we should be able to detect the steel pipe anywhere from the surface to below where we are. (We know that this shaft was sunk hundreds of feet) The assumption is, that since the Gemini can't detect the steel pipe anywhere else, that we must be detecting something between it and us, and we are looking for something that can discriminate between ferrous and non-ferrous materials to try to determine what this before tunneling to it. The concern is that it may be a bomb. What equipment do you suggest that will work in these conditions in the Philippines?

I was ready to fly to Oregon to get a demo from Bob Fitzgerald on his PDF 1000 until I got this note below.....

Hi Bill, This is a "dowsing rod" They have been around for 1000 years. You can do the same with a coat hanger if you can "dowse" It makes me sick to see people get bilked into buying these things , which now go under the phony classification of "long range locators" for lots of $$$. Some even have batteries which serve no function.. Just a good way to make a lot of money from unsuspecting buyers. There should be a law against such things. Nothing
new....best regards, .............

I have since found a Garrett distributor not far from here in Manila who has GTI 2500's for rent and sale, so I am wondering if my best bet is to use my Fisher Gemini 3 on the surface and the Garrett GTI 2500 down in the tunnels?

Any thoughts are greatly appreciated.

Thanks & Best Regards ~

Bill

I thought the Gemini III had a maximum range of about 20 feet.
You will have problems discriminating beyond about 3-6 feet. I've seen a classic Nexus detector accurately detect a non-ferrous metal sheet buried at a depth of 1m, and it is possible to go deeper, but the distances you are talking about are very doubtful. It might be worth trying the GTI. At least you could deduce the distance from your location, based on whether it is detected or not. If you start to tunnel towards it, then the GTI will pick it up as you get closer. However, if it's a large steel object, there's still no guarantee that discrimination will be accurate. I would proceed with caution.

The note you received has saved you a lot of wasted time and money. Bob Fitzgerald's LRL contraptions are simply dowsing rods with some added do-nothing electronics. It's just more wallet-mining.
http://www.treasurenow.com/html/products.html
Have a look at this report of one of his so-called "locators":
http://geotech.thunting.com/cgi-bin/.../me2/index.dat

[Bill Smith]

Qiaozhi ~

Thank you so much for your analysis and the link to Carl's, much appreciated! Yes, I think the Gemini probably has a maximum reach of 20 feet, and it does not discriminate, so I see your point and my mistake about thinking about using it from the top. I think you are correct about using the GTI while tunneling, and yes, caution is key. We don't want to run into a bomb, but we also don't want to miss a cache avoiding one. If you have any ideas about genuine equipment that can discriminate and work up to the 150 depth range it is greatly appreciated. Thanks again for saving me a lot of time and money, it is greatly appreciated.

Bill

[Bill Smith]

GPL From KELLYCO

What do you think about this?

http://www.kellycodetectors.com/gpl/ground.htm

Thanks ~

Bill

[Qiaozhi]

What do you think about this?

http://www.kellycodetectors.com/gpl/ground.htm

Thanks ~

Bill

I think this is a question for Carl.