Fisher GEMINI-3 warranty Searching, Prospecting Tips, Narrow Scan Inductive Search, Mapping

SEARCHING

Narrow Scan Inductive Search

   This mode of operation is performed by a single operator using the 3-piece handle. It is the best method for locating small or short objects (chest, coin-jar, rifle, etc.). However, it is also an effective way to locate pipes, cables and ore veins.

Set Up

1.Assemble the 3-piece handle by inserting each end piece into the center handle section. Tighten the two center knobs finger tight until there is no wobble. Place the transmitter on its back and insert the end of the handle with the single brass shaft into the V-shaped slot. Turn the knob until it is finger tight and the handle is firmly in the slot.

2.Align the receiver panel holes with the upper- handle threaded shafts. Tighten the lower black knob until it is finger tight.

3.Turn the balance knob (with white arrow) until the spring is under tension (at least 10 turns).

Figure 4. Narrow Scan	Figure 5. Assembly for Narrow Scan Inductive Search
Inductive Search

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PROSPECTING TIPS

Mapping

When an area of high conductivity is encountered, outline and stake it by crossing and recrossing, using the Narrow Scan Inductive Search mode. It will be noted that in and near the conductive zone, a maximum indication will be received in only one definite direction when the operator stands at one point and rotates the instrument parallel to the surface of the ground. Record the meter readings as read in the maximum directions, at various points along the zones. Note the character of the overburden, outcrops and topographic features.

   When the area being inductively surveyed has been completely covered and all of the conductive zones have been staked, these zones are surveyed and plotted on a map. The map should include all creek bottoms, gullies, outcrops and other physical features. The ideal map on which to plot the conductive zones is a topographic and geological map of the proper scale. In this way it is possible to correlate the zones directly with the topography and geology, and thus determine the possible reasons for the presence of the various conductive zones.

Locating Placer Deposits

   A lot of prospectors have told us they would like to use a two-box for locating placer gold. In general, these deposits contain such a small amount of gold that it cannot be detected. Placer gold, however, is usually associated with a certain amount of black sand, and some placer deposits carry iron sulphide. Both of these mineral substances are definitely conductive, and may be detected by the GEMINI-3. It is through the detection of these minerals that the placer gold may be located.

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