Fisher GEMINI-3 Metal Detector User Manual


 
5
DEPTH
The GEMINI-3 was designed to locate large, deep objects such
as an iron chest, pipe or an ore vein. It will not detect small coin-
sized objects. A quart jar full of coins, however, may be detected
one-to-three feet deep. A 55-gallon drum may be detected as
deep as 10 feet. A very large object, like an automobile, may be
detected at 20 feet or more.
The ability of the GEMINI-3 to detect objects at various depths
depends on several factors:
1. Ground Mineralization: The penetrating power of the
GEMINI-3 is adversely affected by the presence of
magnetite (a black iron oxide) and wet conductive
mineral salts. For example, an object that can be
detected at 15 feet in neutral ground may be
detected no deeper than 5 feet in highly mineralized
ground.
2. Size and Depth of Object: A 4-inch diameter target
will produce signal 64 times stronger than a similar
1-inch diameter target at the same depth. An object
1-foot underground will produce a signal 4,000 times
greater than the object 4 feet deep.
3. Length of Time Object is Buried: An object that has
been buried for a long time may be easier to detect
than a newly buried object. Rust and other oxides as
well as mineralization caused by the interaction of
the metal with soil chemicals are good conductors
and aid detection.
4. Shape of an Object: Ring or looped shaped objects
lying at produce the best results. Flat or dish shaped
targets are also easy to detect. Rod shaped objects,
especially when scanned on end, are very difcult
to detect.
5. Operator Skill: Probably the most important factor of
all, practice over known buried targets is essential.
20
LETS PRESERVE OUR TREASURED SPORT!
Laws governing the use of metal detectors are becoming
more and more common. In many countries, the use of metal
detectors is illegal or severely restricted. Don’t let this happen in
your area.
ALWAYS get permission to hunt on private property.
ALWAYS leave a site cleaner than you found it. Take at least
some trash with you or, if you can, take it all.
ALWAYS ll in your holes neatly whether you’re in a city park
or remote wildernessness. Leave the land as it was before you
disturbed it.
ALWAYS obey all laws relating to Treasure Hunting.
ALWAYS return valuable property if you can locate the original
owner.
ALWAYS do whatever you can to give the hobby of Treasure
Hunting the good image it needs and deserves.
TREASURE HUNTERS’ CODE OF ETHICS
Gemini-3manual-.ind2 5 6/13/06 2:52:51 PM