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 Metal Detecting 

Metal detecting is a hobby that can actually pay you back! It is one of the most fun ways to find gold and other metallic treasures such as coins, jewelry, and relics. It has practical applications, too, beyond hunting for buried treasure. You can locate pipes underground or hidden metal boundary markers. If you lose an earring or a key in tall grass, sand, or in a pond, a detector will find it quickly. It's so easy to have your metal detector ready to go in its carry bag with detecting accessories such as extra coils, a digger or scoop, headphones, and spare batteries. Just grab and go!

No doubt if you've bought a metal detector, where it's a Bounty Hunter, or Tesoro (Spanish for "treasure"), a Garrett, or Fisher (the oldest brand of detectors), or Teknetics, or another brand, you probably can't wait to use it. But what if you haven't quite made the decision yet as to which one to buy? Below are a few common Questions and Answers about metal detecting that might help you decide:

What is the best metal detector? This is probably the number one question that everyone asks. Unfortunately, there is no one single answer. Each metal detectorist usually has specific needs that cannot be met by one single detector. The easiest way to find the "best" detector is to evaluate YOUR detecting style, your experience level, what items you hope to find, and the time that you will spend metal detecting. After taking all of these things into consideration, then you will be able to find a metal detector that fits your needs and your budget.

Can one metal detector really do it all? Most metal detectors are designed to excel at one type of hunting or another but can be used for other types of hunting as well. For example, most gold detectors use some form of higher gain in the circuitry to get better sensitivity to small gold nuggets in the ground. While this is a good thing for prospectors, coin hunters may find it annoying that their detectors are picking up every piece of a pulltab that has been run over with a lawnmower. If you live by the water or travel there often, and will be mainly metal detecting on a beach, you might want a waterproof model, or want to use water resistant coil. The art of metal detector design is the art of compromise. By accenting certain characteristics of any detector, you take away from other features. Any metal detector that does it all may not work as well for very specific treasure hunting. Finding a detector with the features that will best suit YOUR hunting style is the most important choice you can make when deciding to puchase a metal detector.

Are detectors with a lot of knobs better than those with just a few? How much better is a $900 metal detector than a $200 metal detector? Generally speaking, the higher the price of a metal detector, the more features that it will have. More features translate into more knobs. The more features and/or knobs that a detector has, the more you are able to tune the metal detector to the type of hunting conditions that you are likely to encounter. With that being said, the downside to a large number of features is that even though you are able to fine tune the detector to match the local conditions, there are also more ways of setting up the detector incorrectly. Setting up a machine "wrong" may result in a decrease in depth and sensitivity and your $900 metal detector may be outdone by a $200 model! Reading and re-reading your Owner's Manual cannot be emphasized enough!

best metal detector
How Deep Do Metal Detectors Go?  That depends on two things: the detector circuitry/coil design and environmental factors.

Coil and circuitry design determine the overall ability of any metal detector to find targets. During the design phase of any detector, the engineers decide which features to include. The things that they consider are the type of hunting and who will be using it. A beginner's model may not have the bells and whistles of the more professional models, but it will be easier to use. The more specific a metal detector's design, the narrower set of features it will have. Some detectors designed for ultimate depth will be hard for a beginner to use or may be too sensitive to use in trashy areas. Coil size will affect the depth of the metal detector but may not be suited for a particular type of hunting.

Environmental factors include just about everything except the detector and coil. Just a few of the things to take into consideration are the size and shape of the target, soil conditions, orientation of the target in the ground, content of the target, and any outside interference, such as electrical wires and radio or cell phone traffic. Weather conditions, such as rain-soaked ground, may also play a part in the depth and sensitivity of any detector.

With all that being said, an average metal detector using a stock coil in moderate ground should see the following targets with these ranges:

Dime to nickel: 4 to 8 inches
Quarter to half dollar: 6 to 12 inches
Dollar to fruit jar lid: 8 to 16 inches

Knowing your metal detector and using it properly are the two most important things that you can do to get the best depth and sensitivity out of any machine. Again, don't under estimate the importance of reading and understanding your detectors' Owners Manual!

Recommended Reading:

How Do Metal Detectors Work?

All About Metal Detector Search Coils

Understanding Key Metal Detecting Concepts
metal detectors
Metal Detecting Terminology:
 

All Metal: a non-discriminate control setting that accepts detection of all metal objects, including ferrous (i.e. iron-containing) ground minerals.

Audio ID: also known as tone ID, this metal detector feature identifies targets via a tone that corresponds to their conductivity.

Cache: a group of objects that has been intentionally hidden or buried.

Clad: a term for coins that are still in circulation. With clad coins, a surface metal covers or clads a base metal. Pennies, for example, used to be made from copper, but are now copper-clad zinc.

Coil: also known as the head, loop, or antenna, a coil is the metal-sensing part of a metal detector. 

Coin Shooting: a slang term for coin hunting, or going detecting specifically in search of coins.

Concentric Coil: concentric means "having a common center." Concentric search coils feature circular transmit and receive windings of unequal diameters that are aligned on a common center, producing a cone-shaped search matrix. If the wire coils/windings of a concentric coil are on the same plane, it's referred to as coplanar concentric.

Conductivity: conductivity refers to how well a target allows electrical current to flow through it. For example, electrical currents freely flow around a highly conductive coin when energized by the electromagnetic field from a metal detector.

Discrimination: discrimination is a metal detector's ability to identify buried targets based on conductive and/or ferrous properties. Based on measuring these properties, it is possible to determine valuable targets from junk targets so you can spend more time digging valuable targets.

Electromagnetic Field: an electromagnetic field is an invisible matrix created by electrically charged objects. In metal detectors, the electrical current moving through the transmitter coil of the search head produces an electromagnetic field, and this field extends to a depth perpendicular to the size of the coil. When the field encounters metals, they generate their own fields, which can be measured by a metal detector's receiver coil.

Elliptical Coil: an ellipse is an extended oval shape resembling a flattened circle. A search coil in this shape is called an elliptical coil. Elliptical metal detector coils can be either concentric or widescan. 

Ferrous: ferrous objects (targets) contain iron and therefore are attracted to a magnet (nails, tin cans, horseshoes, etc.). Many natural and man-made objects contain iron, most of these are junk targets, although some could be valuable relics. Non-ferrous materials do not contain iron. Good targets include coins, gold rings, and copper artifacts. Examples of junk targets are bottle tops, pull tabs, and aluminum foil.

Frequency: frequency refers to how fast a metal detector sends signals into the ground. Frequency is measured in Hertz (Hz). Certain frequencies detect certain targets better than others, e.g., high frequencies find very small targets while low frequencies find deeper/larger targets.

Ground Balance: soil often contains ground minerals, magnetic material composed of ferric oxide and other metals. These iron-bearing materials cause loss of depth in a metal detector. Ground balance is the ability to manually or electronically ignore/neutralize these signals (sometimes called ground tracking or ground reject).

Ground Mineralization: naturally occurring minerals in the ground that affect a metal detector's performance. There are two main types of ground mineralization: one is due to iron particles and can be identified by its red coloration; the other is due to salt, such as salt water beaches. Iron particle mineralization causes the ground to become magnetic and salt mineralization causes the ground to become conductive. Both forms of ground mineralization can produce false signals that mask targets. The ground mineralization illustration shows minerals in the ground producing a response to the metal detector's electromagnetic field.

Masking: masking occurs when ground minerals or buried objects interfere with the detection of a legitimate find, resulting in a mixed signal. 

Matrix: the total detection area covered by a search coil's electromagnetic field. 

Notch: notch filtering or notch discrimination is used to create a range of accepted and rejected targets. Setting the notch level on your metal detector to discriminate against certain objects means tuning out or blocking a particular frequency band. This is called notch reject. Conversely, creating a notch window of accepted frequencies is called notch accept.

Null: when a metal or coin detector coil passes over targets that have been discriminated against or are outside of the accepted notch window, a metal detector's threshold audio will go quiet or drop momentarily, i.e. go null.

Pinpointing: refers to the act of determining the precise location of a target. This can be accomplished by manually "detuning" a metal detector, or adjusting it to be less sensitive, and then sweeping the target response area again. Because the metal detector is less sensitive after detuning, an audio signal should provide a more exact location due to the strength of the signal.

Prospecting: treasure hunting with a metal detector in search of gold, silver, or valuables.

Relic Hunting: metal detecting in quest of objects that possess historical (and sometimes also monetary) value.

Sweep: the motion a metal detectorist employs when using a metal detector, it usually resembles the side-to-side movement used when sweeping a floor.

Target: any metal object that can be detected by a metal detector. A target can be either valuable, such as coins, or junk like a bottle cap.

Target ID: numbers and audio tones are produced by a metal detector to enable you to identify targets based on their conductive and/or ferrous properties.

Threshold: the threshold is essentially status quo for the listening detectorist. The threshold is a continuous, faint tone that provides an audible reference point for ground-balancing a detector. It also determines the minimum sound level for pinpointing targets, including deep targets in discriminate mode.