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Minelab GPX 4500 Gold Nugget Detector

Minelab GPX 4500 Dual Coil package 2015

The Minelab GPX 4500 detector was released in the spring of 2008 and is currently still in production. I got one the same year and saw many others in use at my old mine at Moore Creek, Alaska. The GPX 4500 made the ground light up like it had never been hunted with many nuggets found in already detected locations. Post at

The Minelab series of pulse induction (PI) metal detectors starting with the SD 2000 are widely acknowledged as being some of the most powerful gold nugget prospecting detectors currently available. The GPX 5000 is the latest and most refined in the series but the GPX 4500 is only just a step behind it in features and performance. See Steve's Guide to Differences of Minelab SD, GP, & GPX for details.

The GPX 4500 created a page in gold rush history by being singled out as the detector of choice in Africa for some time. Many large nugget finds were made there with the new GPX 4500 and starting around 2009 demand far exceeded supply as African prospectors were willing to pay any price to get what they believed was the only detector capable of possibly making them rich. Buyers in the U.S. drove prices far over retail due to extreme demand and these units were resold in Africa for prices well exceeding $10,000 per machine. This amazing demand was almost single-handedly responsible for driving Minelab sales and stock prices to all time highs.

When the GPX 4800 and GPX 5000 were introduced Minelab stopped selling the GPX 4500 in the U.S. and Australia but demand was such that it continued to be sold in Africa. Finally, in 2015 the GPX 4500 was reintroduced for sale again in those countries as an entry level pulse induction model (for Minelab) priced at less than half what the GPX 5000 sells for. This makes the GPX 4500 an exceptional value at this time.

Download the Minelab GPX 4500 Instruction Manual Here

Minelab GPX 4000-5000 Manuals & Timings Charts

Minelab GPX 4500 Product Brochure

Minelab GPX 4500 Technical Specifications*
Internet Price $2699.00
Technology Ground Balancing Pulse Induction (GBPI)
Frequency 1100-4500 PPS?
Autotune (Motion) Mode(s) Very Slow, Slow, Medium and Fast
Ground Rejection Slow, Medium, Fast Tracking, Fixed, and Off
Soil Adjust Six settings (timings) - see chart below
Discrimination Variable 1-10 and Off in Menu
Volume Control Variable 1-20 in Menu
Threshold Control One turn control
Tone Adjust Variable 1-100 in Menu
Audio Boost Quiet, Normal, Deep, Boost in Menu 
Frequency Offset Automatic Tune plus Manual 0-255 in Menu
Pinpoint Mode No
Audio Output 1/4" headphone socket (No speaker) Headphones supplied
Hip Mount Shaft Mount Only
Standard Search Coil(s) Commander 11" round DD
Commander 15" x 12" Mono
Optional Search Coils Over 100 accessory coils available
Battery Rechargeable 7.4VDC 9.2A/hr Lithium Ion
Operating Time 14 - 15 hours
Weight 5.3 lbs (w/11" coil, excluding battery (1.7 lbs)
Additional Technology Multi Period Sensing (MPS)
Dual Voltage Technology (DVT)
Smart Electronic Timing Alignment (SETA)
Numerous Audio Adjustments via menu
Coil (Double D/Mono/Cancel) - 3 pos. switch
Notes The GPX 4500 employs an external battery carried on a backpack harness and connected to the control box via a power cord. The detector is normally suspended from the harness with a bungee cord, allowing for nearly weightless operation in level ground.

*Notes on Technical Specifications - Detailed notes about the specifications listed in this chart.