Types of Metal Detecting Activities, page 12:
Types of Metal Detectors Required for Metal Detecting Coin Hoards:
• Manually- or Self-adjustable detectors capable of detecting ALL types of coins, including the tiniest silver hammered coins, and using a large search coils (15" in diameter and larger) are essential for Cache Hunting Type I.
• Metal detectors with Auto Tune or S.A.T. (Self Adjusting Threshold) option are preferred.
Automatic tuning offers a significant advantage when searching over mineralized ground and helps keep the metal detector operating at maximum sensitivity without requiring constant adjustments by the operator. It improves the stability, reduces noise, and allows higher Gain settings to be used.
• Detectors with multiple frequencies, such as Minelab Explorer II Pro, Minelab Explorer SE, and Minelab E-Trac are the most effective for all types of cache hunting. These machines can effectively process the signal coming from a coin cache through the mineralized soil from great depths.
• Hand-Held Scanners are used for Type IV cache hunting.
• Two-Box detectors and Deep Seekers, such as Pulse Star II Pro - Pulse Induction metal detector, designed for locating deep sizable targets such as large hidden caches are essential for cache hunting of Types II and III.
Pulse Induction (PI) detectors of the conventional physical design can be used for cache hunting in rural areas where iron trash is not present in large quantities. PI detectors are intended for maximum depth under extreme search conditions such as highly mineralized ground. The shortcoming of PI detectors is their inability to identify and reject ferrous (iron) trash.
Necessary Detector's Features, Equipment & Accessories:
• Manual Ground Balance or Automatic Ground Balance (with all Multi-Frequency detectors and some VLF and High-Frequency detectors)
• Auto Tune or S.A.T. (Self Adjusting Threshold)
• All Metal mode for detecting the deeply buried large targets in areas that are free of shallow junk
• Headphones are required for being able to hear deep "tiny" signals emitted by coin caches, and not to attract attention of passersby or annoy them.
• Round DD (Double D) Large Search Coils of 15" in diameter and larger should be used after the area has been cleared of the shallow targets with a standard search coil.
• Hip-mount configuration for searching with large coils for extended amount of time.
• Small Search Coils of 7" and less in diameter - "snipers," can be used for Type IV cache hunting.
• Black Light Illuminators are used for searching for valuables stashed inside cellar walls (Type IV cache hunting).
• Treasure Hunting Shovel made of special steel (Lesche, Fiskars), with T-handle, and designed for digging targets in soils of any type.
• 3-Piece Steel Probe with a T-handle especially designed for locating large objects buried down to 1.8m. The searcher drives the probe vertically down through the soft or sandy soil until the probe hits something hard. An experienced searcher can identify the object's material (iron, aluminum, stone, wood, etc.) by feeling the vibrations received by the handle. This probe is also very useful as an accessory to 2-Box and Deep Seeking metal detectors.
• Thick Large Plastic Bags for transporting large amounts of soil mixed with coins
• Sturdy Light Gloves will protect your hands from accidental cutting by broken glass or sharp fragments of rusty sheet iron.
• Headlamp is good to have when your daylight coin shooting activity is likely to continue into the night hours. Headlamp is the must if you plan to do night hunts or search inside the confined spaces (Type IV cache hunting).
• Kneepads are recommended.
• A reliable 4x4 vehicle is sometimes a "must" to get to the remote and less accessible areas during coin cache hunting of the second and third types.
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