The versatile GPX‑4500 has great performance on all sizes of gold, and penetrates mineralised ground deeper than all basic PI detectors.


Treasure Talk blog posts on the GPX-4500

Gain, what’s a good level to start from?

March 18, 2011 12:12pm

Jonathan Porter
Jonathan Porter metal detecting gold

On page 63 in the GPX 5000 Instruction Manual, Gain is described as being:

“…..a function that allows the GPX Series to be optimised for differing conditions; controlling the sensitivity of the detector to its environment and targets.”

Basically speaking this means you can use the Gain control to lift or brighten the response from a signal, a little like increasing the volume of your detector but in a more dynamic way.

Posted by Jonathan Porter on March 18, 2011 12:12pm | 5 Comments

Achieving good Ground Balance when using the 'Smooth Class of Timings'

January 14, 2011 03:35pm

Jonathan Porter
Jonathan Porter metal detecting gold

For my fourth blog on Treasure Talk I want to pass on some of my experiences about achieving a good Ground Balance (GB) when using Smooth, Enhance or Fine Gold. As most of you will know by now the 'Smooth Class of timings' were developed for the GPX Series to allow the use of a Monoloop coil in highly mineralised soils. The timings do this by removing a lot of the ground signal, however in doing so they also remove a small amount of the target signal too, dependent on Ground Balance position, target orientation and more particularly size and shape of target.

The reason it’s suggested a Monoloop coil is better for performance is they provide better...

Posted by Jonathan Porter on January 14, 2011 03:35pm | 6 Comments

Why Pulse Induction metal detectors work so well for gold detecting

November 22, 2010 11:51am

Phil Beck
Phil metal detecting

So as not to make this article enormous, if you see apparently strange new terms or acronyms, please consult our Terminology reference. (
By now, I would imagine that many metal detector operators have come up against the problem of mineralised ground when looking for gold. This is ground that produces noise from a conventional detector. Many gold fields around the world contain mineralised ground to varying degrees. In Australia, the gold fields contain exceptional levels of mineralisation.

Posted by Phil Beck on November 22, 2010 11:51am | 3 Comments

Specific Ground Balance on the GPX detectors

October 13, 2010 01:58pm

Phil Beck
Phil metal detecting

The GPX-4000 metal detector first introduced a special ground balance mode called Specific Ground Balance which is still used in newer GPX detectors. This ground balance mode may allow the detector to ground balance in areas that otherwise would have too much ground noise. The Specific mode uses a special second-order ground balance algorithm that can deal with more complicated ground responses than the normal first order ground model.

If you ground balance in the normal way and the detector still displays ground noise then this may be a situation for Specific ground balance mode.

Posted by Phil Beck on October 13, 2010 01:58pm | 1 Comment

Don't forget Factory Preset!

September 20, 2010 01:50pm

Phil Beck
Phil metal detecting

I have heard from some users that have tied themselves into knots when trying to find the best settings for their detector. This can happen because there are some combinations of settings that don’t work well together and there are some lesser used settings that you may have set and then forgotten to check.

In these cases please remember to perform a Factory Preset. This will return your detector to the settings that it contained from the factory.

Posted by Phil Beck on September 20, 2010 01:50pm | 7 Comments

GPX Audio Controls

August 16, 2010 10:16am

Phil Beck
Phil metal detecting

In this post I will try to explain the GPX audio controls in a different way to that described in the user manual. There are tools available on a web page that can't be used in a printed manual. I'd like to try and visualize the way that the audio controls affect the sound that the operator hears

Posted by Phil Beck on August 16, 2010 10:16am | 10 Comments

GPX-4500 for Coin & Treasure use

July 19, 2010 09:01am

Des Dunne
Des coin hunting

Have you ever given any thought to using your GPX-4500 for the pursuit of valuable gold and silver coins and other treasures?

One doesn’t have to reserve the GPX-4500 just for gold prospecting! It is a fine general purpose coin machine as well!

There are plenty of valuable single and caches of coins out there to find and the GPX-4500 is perfectly suited to the job e.g. ghost town detecting, cache hunting in rocky mountainous regions of the deserts searching for “Wild West” stage coach and bank robbery caches, treasures deposited in Europe during the two world wars and in the former ‘Iron Curtain’ regions of the former USSR. 

Posted by Des Dunne on July 19, 2010 09:01am | 0 Comments

Why don't you use the Mode switch on your GPX?

July 09, 2010 01:25pm

Phil Beck
Phil metal detecting

In my travels, talking to Minelab GPX users I have encountered few people who make much use of the mode switch. When we first designed the GPX-4000, after much discussion we put a 'Mode' switch on the front panel. Our intent with this switch was to try and let operators do one of three things with this new switch.

1. New users could easily change the character of the detector before learning the finer points of the settings in the menus on the LCD. This is a bit like using the dial on the top of your digital camera to change between Sports, Portrait and Night modes...

Posted by Phil Beck on July 09, 2010 01:25pm | 1 Comment

Four Tips to Help Your Detector Auto Tune or Noise Cancel

June 09, 2010 11:46am

Phil Beck
Phil metal detecting

Metal detectors are sensitive instruments designed to detect small changes in magnetic field. Nearby metal changes the field as intended but so do far off thunderstorms, electric motors, electric fences, RF transmitters, power lines and nearly everything that a modern society plugs into an electrical outlet.
Many of Minelab’s metal detectors have a function that allows them to locate and avoid these interfering signals. In some detectors we use the term ‘Noise Cancel’ while in others we use the term ‘Tune’, ‘Auto Tune’ or ‘Manual Tune’. These terms all refer to the same thing, that is the process where the metal detector or the operator searches through the available tuning range, looking for the quietest point at which to operate...

Posted by Phil Beck on June 09, 2010 11:46am | 5 Comments

Counterfeit Minelab Metal Detectors

May 17, 2010 09:30am

Brenton O'Brien
Brenton metal detecting

Imitation is said to be the greatest form of flattery. However, counterfeit Minelab gold prospecting metal detectors and accessories that don’t work is another story altogether.

Counterfeit Minelab metal detectors and accessories are entering the market which either don’t work at all or have extremely poor performance. Unsuspecting detectorists are being tricked into buying metal detectors that look like a GPX-4500, but at best perform like a $50 toy detector.

We first heard reports of counterfeit GPX-4500 metal detectors late last year and obtained a confiscated counterfeit GPX-4500 from Dubai’s Customs Department. We disassembled it and...

Posted by Brenton O'Brien on May 17, 2010 09:30am | 0 Comments

GPX-4500 - Why so many Timings?

May 10, 2010 08:55am

Nenad Lonic
Nenad gold prospecting

To an answer the question above, one needs to know what the Timings actually do. In simple terms, the Timings control the internal parameters of the metal detector’s electronics, or more precisely, the pattern of the pulses. This pattern defines the metal detector’s performance characteristics. So why not just make a single Timings setting that is good for all scenarios?? Well, yes this is possible, but it would have to be a compromise.

Think of a car transmission, 1st gear is great for a steep hill climb, but you wouldn’t use it on the open highway. Likewise, 4th gear is great for the open highway, but you wouldn’t use it to take off! Timings are the same – each Timing is good at a specific task...

Posted by Nenad Lonic on May 10, 2010 08:55am | 2 Comments

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