The QL40-HMM-453 borehole magnetic susceptibility tool is typically used in mining, geotechnical, and lithology applications. All electronic circuitry resides in a high strength non-magnetic enclosure. The operating frequency is chosen to be sufficiently low to avoid interference from rock conductivities and the circuitry is temperature compensated to minimize thermally induced drift. The QL40-HMM-453 is offered with one or two measuring ranges and will resolve strata down to 25 mm. Probe response is practically instantaneous (<0.5s).

The extended range is designed for measurements in complex igneous or metamorphic rocks up to high magnetite rocks. This extended range has been chosen so as to identify layers containing magnetite (0.005 – 100%). The main use of the probe is for prospection on deposits of Fe minerals – magnetite, pyrite and hematite. These data are to be used for quantitative interpretation of the magnetic components in the rocks and estimation of the thickness of layers. In this way, the QL40-HMM-453 can directly be used for economic evaluation of the deposit.

The QL40-HMM tool is offered in standard range (QL40-HM-453), extended range (QL40-HM-453E), sensitive range (QL40-HM-453S), dual range magnetic susceptibility (QL40-HMM-453), and as a combination tool with induction (QL40-HMI-453 or QL40-HMI-453E). A diagram showing the magnetic susceptibility and induction range options is shown below.  All of these options are stackable within the Quick Link (QL) product line or can be run as a standalone tools.

borehole magnetic and induction ranges chart


  • Delineation of kimberlite deposits
  • Economic evaluation of deposits
  • Mineral exploration and characterization
  • Lithology studies
  • Extended range used in complex igneous or metamorphic rocks up to high magnetite rocks
  • Ore Identification and quality correlation

Operating Conditions

Borehole Fluid
[X] Water
[X] Mud
[X] Dry

[X] Uncased
[X] PVC Borehole
[_] Steel

[_] Required
[X] Non-Required

Features & Benefits

  • Two depths of investigation for detailed formation characterization
  • Less temperature drift than other tools on the market
  • Easy to calibrate for specific borehole magnetic susceptibility ranges
  • Operates on any standard wireline (Mono, 4, 7 conductor, or Coax)
  • Slim, 45 mm diameter. One-person operation.
  • Can be combined with other logging tools of the QL product line or operated as a standalone tool.

Specifications – Metric/English

Specification Metric Imperial
Diameter 45 mm 1.77″
Length 1.5 m 59″
Weight 7 Kg 15 lbs.
Max. Temp. 70ºC 158ºF
Max. Pressure 200 bar 2900 psi


Sensor: Two coil system
Standard Intercoil Spacing: 25 cm
Extended Intercoil Spacing: 30 cm
Standard Range: 10E-5 to 0.5 SI units
Extended Range: 10E-4 to 2 SI units
Operating Frequency: ~2 kHz
Accuracy: < 3% F.S.
Zero Drift: Standard – < 2.10-5 SI units/ 10ºC
Zero Drift: Extended – < 1.10-4 SI units/ 10ºC

QL Stack Possibilities

  • QL40-HM + QL40-GR (Gamma): Lithology tool, Glacial till characterization
  • QL40-HM + QL40-IP (Induced Polarization) : Clay Typing, Geotech
  • QL40-HMM + QL40-IP (Induced Polarization) + QL40-SGR (Spectral Gamma): Mining Exploration tool
  • QL40-HMI + QL40-IP (Induced Polarization) : Mineral and Ore body Identification


Data Sheet

User Guide

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