
Minelab USA Inc
871 Grier Drive, Suite B1,
Las Vegas, Nevada, 89119
United States of America
Telephone: +1 (702) 891 8809
Facsimile: +1 (702) 891 8810
Email info@minelabusa.com

THE MINELAB ‘GP extreme’
II
www. minel ab.c om
© Minelab Electronics Pty Ltd
This document contains proprietary information which is protected by
copyright. Apart from any use as permitted under the Copyright Act
1968, no part may be reproduced by any process without written
permission from Minelab Electronics Pty Ltd, 118 Hayward Avenue,
Torrensville, SA 5031, Australia.
WARNING. This document contains Minelab Electronics Pty Ltd
rights, technical data or restricted rights data, or both. Patents and
trademarks apply.
THE MINELAB ‘GP extreme’
III
TABLE OF CONTENTS
INTRODUCTION ................................................................................................................... 1
About this manual..................................................................................................................................... 2
Introducing the Minelab ‘GP extreme’ ..................................................................................................... 3
ASSEMBLY............................................................................................................................ 5
Unpacking your ‘GP extreme’ [easy reference] ..................................................................................... 6
List of pre-assembled sections and parts................................................................................................. 7
Complete assembly instructions.............................................................................................................. 8
BATTERY ............................................................................................................................. 13
Battery and charging .............................................................................................................................. 14
CONTROLS.......................................................................................................................... 17
Detector sounds [easy reference] .......................................................................................................... 18
Control functions: rear panel .................................................................................................................. 19
Control functions: front panel.................................................................................................................. 23
OPERATION......................................................................................................................... 27
Quick start instructions [easy reference]............................................................................................... 28
Detailed operating instructions................................................................................................................ 29
Ground balancing ................................................................................................................................... 33
Iron discrimination .................................................................................................................................. 35
Level Ajust Control................................................................................................................................. 37
contents
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4
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TABLE OF CONTENTS
contents
6
DETECTING TECHNIQUES ............................................................................................... 39
Detecting techniques............................................................................................................................... 40
Prospecting techniques ..........................................................................................................................42
Identifying target signals......................................................................................................................... 43
Recovering the target ............................................................................................................................. 45
USER INFORMATION ........................................................................................................ 49
Technical specifications for the Minelab ‘GP extreme’ .......................................................................... 50
Troubleshooting....................................................................................................................................... 51
Service repair form ................................................................................................................................. 52
Warranty .................................................................................................................................................53
Accessories ............................................................................................................................................ 54
Glossary of common terms ................................................................................................................... 55
Detector care and safety ........................................................................................................................ 59
An important message from Minelab ..................................................................................................... 60
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THE MINELAB ‘GP extreme’
INTRODUCTION
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1
1
Introduction
The ‘GP extreme’ incorporates new
technological advances and control
functions which have resulted in a
detector that combines stable and
effective ground balancing with
‘extreme’ depth and ‘extreme’
sensitivity.

THE MINELAB ‘GP extreme’
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INTRODUCTION
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ABOUT THIS MANUAL
This manual is designed to introduce the detector’s features. It gives you step-by-step
directions for everything from assembling and adjusting your detector, to basic and
advanced detector use.
1. INTRODUCTION
Basic overview of the ‘GP extreme’
and this User
’s Manual.
2. ASSEMBLY
This chapter provides details and
instructions on assembling and
adjusting the ‘GP extreme’
.
3. BATTERY
The ‘GP extreme’ is powered by a
rechargeable battery pack. This
chapter provides details on battery
installation, use and performance.
4. CONTROLS
This chapter is designed to
familiarize you with the various
features of the ‘GP extreme’ control
panel. A few minutes spent reading
this chapter will be a worthwhile
preliminary to basic or advanced
detecting.
5. DETECTOR OPERATION
However experienced you are at
using a metal detector, it is important
that you read this.
6. DETECTOR TECHNIQUES
Once you are comfortable with the
basic detector use, there are a few
techniques you should be aware of.
7. USER INFORMATION
This chapter provides a glossary of
terminology, user guides, technical
specifications, warranty and repair
details and troubleshooting tips.
ABOUT THIS MANUAL
THE MINELAB ‘GP extreme’
INTRODUCTION
1
3
Minelab ‘GP extreme’ is the first detector to use ‘Dual Voltage
Technology
’ (DVT).
Minelab have developed this new Dual Voltage Technology
(DVT) based on the Bi-Polar technology used in our military
detector range.
The New Features
The new features of the ‘GP extreme’ are
• new DVT technology giving greater depth than ever before
• selectable Tx (transmit) modes for different Soil conditions
• selectable Rx (receive) modes for increased sensitivity and
less susceptibility to interference
• adjustable Signal response for target tone variation
• volume limiting for users own preference
• and new ‘GP extreme’ 1100 and ‘GP extreme’ 1800 coils
which have been specially designed to take advantage of the
new DVT.
Minelab are confident that you will find the ‘GP extreme’ to be the
ultimate detector for finding metallic objects in highly mineralised
and/ or salty environments. Simple operation means that both the
beginner and professional will find this detector very easy to use.
Old gold fields, where mineralised ground and too much rubbish
have shielded many nuggets from the
‘prying eyes’ of other
detector operators, will likely yield new finds.
Minelab thanks you for purchasing this ‘GP extreme’
detector and wish you every success in your quest for gold
and treasure.
INTRODUCING THE MINELAB ‘GP extreme’
INTRODUCING THE MINELAB ‘GP EXTREME’
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THE MINELAB ‘GP extrem e’
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ASSEMBLY
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2
Assembly
This chapter provides details and
instructions on assembling and
adjusting the ‘GP extreme’.
THE MINELAB ‘GP extreme’
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INTRODUCTION
1
www.minelab.com
Minelab is always interested in your opinions so if you have any questions or comments
regarding the ‘GP extreme’ or any other Minelab product, please feel free to contact us via your
local Authorized Minelab dealer, or write to us:
Minelab International Limited
Laragh, Bandon
Co. Cork
IRELAND
email: minelab@minelab.ie
tel: + 353 (23) 52101
Contact Minelab
Minelab Electronics Pty Ltd
PO Box 537 Torrensville Plaza
South Australia 5031
AUSTRALIA
email: ho@minelab.com.au
tel: + 61 (8) 8238 0888
Visit our site on the World Wide Web: http://www.minelab.com for the latest information
on Minelab products and services.
Minelab USA
2700 E Patrick Lane, Suite 11
Las Vegas, Nevada 89120
UNITED STATES OF AMERICA
email: minelab@minelabusa.com
tel: + 1 (702) 891 8809
Minelab USA Inc
871 Grier Drive, Suite B1,
Las Vegas, Nevada, 89119
UNITED STATES OF AMERICA
email: info@minelabusa.com
tel: +1 (702) 891 8809

THE MINELAB ‘GP extreme’
6
ASSEMBLY
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UNPACKING YOUR ‘GP Extreme’
A. ‘GP extreme’ 1100 Coil with Skid Plate and
Fibreglass Lower Shaft attached.
B. Intermediate Shaft.
C.
‘GP extreme’ Control Box with Upper
Shaft, Handle, Arm Rest, Arm Straps and
Neoprene Armrest Cover attached.
D. Headphones.
E. Battery and Battery Pack.
F. Velcro Straps, Knuckle and Bungy Cord.
G. Battery Cable.
H. Vehicle Charger.
I. Mains Charger.
J. Backpack Strap.
K. Instruction Manual, Field Guide and Rubbish Bag.
L. Hard Carry Case.
M.
‘GP extreme’ 1800 coil with skidplate (in separate
carton).
The ‘GP extreme’ as shipped
Figure 2.1 Contents of the ‘GP extreme’ pack
P0501-A
easy reference
UNPACKING YOUR ‘GP extreme’
THE MINELAB ‘GP extrem e’
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LIST OF PRE-ASSEMBLED SECTIONS AND PARTS
PRE-ASSEMBLED SECTIONS
Fig ure 2.2 Pre-assembled sections and parts list
A. Lower Shaft Assembly
1. Extreme 1100 Coil
2. Coil Cable
3. Skid Plate
4. Fibreglass Lower Shaft
5. Nylon Nut & Bolt
6. Teardrop Washers
B. Intermediate Shaft Assembly
7. Intermediate Shaft
C. Upper Shaft Assembly
8. Upper Shaft
9. Handle with Wrist Strap
10. Control Box
11. Armrest Parts (2)
12. Nylon Bolt (2)
13. Nylon Nut (2)
14. Arm Straps (2)
15. Armrest Cover
D. Headphones
16. Headphones
E. Battery and Battery Pack
17. Battery
18. Battery Pack
19. Battery Power Cable
F. Extras
20. Velcro Cable Straps (3)
21. Bungy Cord
22. Bungy Knuckle
A.
B
C
D
E
F
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Inventory
When unpacking your ‘GP extreme’, you will find that a number of
the components have been pre-assembled for your convenience.
Figure 2.1 (page 6) shows a list of the parts as they are packed.
Figure 2.2 (page 7) shows the pre-assembled sections and a list
of parts.
Should you need to assemble the ‘GP extreme’ from
all the various components, here are detailed
assembly instructions.
Assembling and fitting the armrest
Figure 2.3, refer also Figure 2.2
STEP 1 Place the two armrest halves (11) on either side of the upper
shaft (8) and ensure that the bolt holes are aligned.
STEP 2 Slide the two nylon bolts (12) through the bolt holes and
screw the nylon wing nuts (13) onto the bolts by a couple of
turns.
STEP 3 Slide the ‘T’ section on top of the control box (10) into the
armrest with the battery plug at the rear. Tighten the nylon
wing nuts by hand.
STEP 4 Attach the arm rest straps (14) using the press studs on both
sides of the arm rest.
STEP 5 Push the arm rest straps (14) through the slots in the
neoprene arm rest cover (15) and then push the cover over
the arm rest (11).
COMPLETE ASSEMBLY INSTRUCTIONS
COMPLETE ASSE MBLY INSTRUCTIONS
Fig ure 2.3 Armrest assembly
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COMPLETE ASSEMBLY INSTRUCTIONS
Attaching the handle and bungy cord
Figure 2.4, refer also Figure 2.2
STEP 1 Slide the handle (9) onto the other end of the upper shaft (8)
and set it to a comfortable position. Tighten the two screws in
the base of the handle with a small flat tipped screwdriver to
hold the handle in position.
STEP 2 Slide the bungy cord knuckle (22) of the bungy cord onto the
upper shaft (8).
Assembling the Intermediate and Upper shaft sections
Figure 2.5, refer also Figure 2.2
STEP 1 Slide the intermediate shaft (7) into the end of the upper shaft
(8) and snap into place.
STEP 2 Check that the coil (1) has a skid plate (3) attached.
STEP 3 Check that the coil pivot end of the lower fibreglass shaft (4)
has two teardrop washers (5) installed.
NOTE The washers should always be full thickness
and should be replaced regularly as they wear out and
allow the coil to become loose.
STEP 4 Push the lower fibreglass shaft (4) into the mounting brackets
on the coil and ensure that the spring clip at the rear of the
fibreglass shaft faces the rear of the coil.
Attaching the coil
Fig ure 2.5
STEP 1 Line up the holes in the coil with the pivot end of the
fibreglass shaft (4).
STEP 2 Push the nylon bolt through the holes and fit the nylon wing
nut then tighten by hand.
NOTE Do not over tighten the nut as the coil housing
may be crushed or damaged.
Fig ure 2.4 Handle and bungy cord
Fig ure 2.5 The coil pivot end of the lower
fibreglass shaft
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ASSEMBLY
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COMPLETE ASSE MBLY INSTRUCTIONS
Securing and connecting the coil cable
NOTE Always ensure that the control box is turned off
completely before connecting or disconnecting the coil.
STEP 1 Wind the coil cable around the shaft and plug the coil
connector into the coil socket on the control box. Check that
the cable is wound firmly around the shaft without strain,
leave enough slack at the bottom of the cable near the coil to
allow for adjusting the angle of the coil without placing strain
on the coil cable.
STEP 2 Fasten the cable into position using the Velcro straps
provided (20).
Fitting and connecting the battery pack
Figure 2.6
STEP 1 Fit the battery (17) into the back pack pouch (18).
STEP 2 Connect the headphones (16) and the power cable (19) to
the appropriate sockets in the cap of the battery.
STEP 3 Put on the back pack (18).
If the coil cable is able to move
around, especially near the coil, it
will be
‘seen’ by the detector and
cause random noises which may be
confusing.
HINT
Use only the 6v DC battery supplied
CAUTION
Attaching the lower fibreglass shaft
Figure 2.2
STEP 1 Slide the lower fibreglass shaft (4) into the intermediate shaft (7).
STEP 2 Adjust shaft length and coil angle for a comfortable position.
Minelab recommends that the shaft length be set to give a
comfortable sweep length of approximately 2 meters. The
lower fibreglass shaft can be set into position by locating the
spring clip into the holes provided in the intermediate shaft
and hand tightening the locking nut at the end of the
intermediate shaft.
THE MINELAB ‘GP extrem e’
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ASSEMBLY
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COMPLETE ASSEMBLY INSTRUCTIONS
STEP 4 Ensure that the power switch on the control box is switched
off and plug the connector on the power cable (19) into the
battery connector plug on the control box. This cable
connects the battery and headphones to the detector.
Adjust for your own comfort
STEP 1 Adjust the bungy cord (21) from the knuckle (22) on the shaft
to correct length to take some of the weight when
prospecting.
STEP 2 Adjust the hand strap on the handle (9) for your own comfort.
Fig ure 2.6 The ‘GP extreme’ battery assembly
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THE MINELAB ‘GP extrem e’
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BATTERIES
3
3
Battery
The ‘GP extreme’ is supplied with a 6v
DC rechargable battery pack plus both
mains and vehicle chargers. This chapter
provides details on battery installation,
use and performance.

THE MINELAB ‘GP extrem e’
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BATTERIES
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The Battery
The 6v DC rechargeable battery should provide enough power to
operate the detector for 10-12 hrs, when fully charged.
The battery may be recharged at any time during the discharge cycle.
It is very important to fully charge the battery before storage.
Do not leave a battery fully discharged for longer than one day.
CAUTION Never use a 12v DC battery because this would
damage the detector. This damage is not covered by
warranty.
Low Battery Indication
If battery level drops below the desired power to give full function, a
series of signal pulses are given at 0.5 second intervals.
Charging the battery
STEP 1 Turn the detector Off before disconnecting the battery.
STEP 2 Disconnect the battery cable from the detector and connect
to the appropriate charger.
Battery Chargers
Two types of battery chargers (Mains and 12v Vehicle Charger)
are supplied.
BATTERY AND CHARGING
BATTERI ES AND CHARGING
Do not leave the mains charger
on for extended periods because
reduced battery life may result.
Caution
When charging, the battery must
be kept in an upright position.
Important
THE MINELAB ‘GP extrem e’
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BATTERIES
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BATTERI ES AND CHARGING
Mains Battery Charger
The mains battery charger will charge the battery from local mains (AC)
power outlets.
STEP 1 Connect the mains charger to a mains outlet.
STEP 2 Switch the mains outlet on.
Check the charger nameplate; it should be rated at 500mA
or1000mA. The 500mA charger will recharge a completely flat
battery in approximately 20 hours. The 1000mA charger will
recharge a completely flat battery in approximately 10 hours.
Partially discharged batteries require a shorter period to recharge.
Allow approximately 1.5 to 2 hours charging for each hour the
battery was in use if using a 500mA charger and about 0.5 to 0.75
hours for each hour usage on a 1000mA charger.
Vehicle Battery Charger
The vehicle battery charger will charge the battery from the cigarette
lighter socket of most motor vehicles.
STEP 1 Connect the charger to the cigarette lighter socket and turn
the ignition switch to Accessories.
This supplies 12v DC power to the cigarette lighter socket. This voltage
is converted by the charger to charge the detector battery. A red LED
indicator will flash while the battery is charging. When the battery is flat
the LED may flash fast enough so as to appear constantly on. As the
battery charges, the LED will flash at a slower rate.
STEP 2 Leave the battery to charge for approx. 10 hours using this charger.
If the battery voltage of your vehicle drops below 11v, the charger
will stop operating. Therefore the battery charger should not flatten
the vehicle battery.
Check that your vehicle battery is in good condition before camping
in remote areas.
Run your engine above idle speed for at least 30 minutes each day
to keep your vehicle battery charged.
The Vehicle Battery Charger is
designed for use with vehicles
which have a negative earth
electrical system.
Most cars manufactured after 1970
should have negative earth electrical
system.
Connecting the charger to a vehicle
with a positive earth system will
cause the fuse in the cigarette lighter
plug to blow and the LED indicator
will not light.
Caution