magneticsAirborne magnetic surveys map the variation of the Earth’s magnetic field strength caused by magnetic minerals in the Earth’s upper crust.

The Earth’s magnetic field is directly influenced by geological structures, geological composition and magnetic minerals, most often due to changes in the percentage of magnetite in the rock.

Developments in instrumentation and data processing techniques can map sedimentary basin structure and litho logy, geological faults, lineaments and fracture systems, and magnetic anomaly targets.

Airborne magnetic surveys are an important component in mineral, hydrocarbon, coal and geothermal exploration projects.

Equipments:

Typically a single magnetometer sensor is mounted on a fixed wing aircraft. As the aircraft flies through the air it measures the magnetic field, attitude of the aircraft, GPS position and altimeter data. An onboard computer records the raw data and corrects the magnetic data for aircraft attitude variations.

The final data is tie line leveled and/or micro-leveled and includes corrections for diurnal fluctuations, IGRF and system parallax.

  • Airborne Magnetometer counter – processor system
  • Real-Time and post processed Magnetometer Compensation Module for single sensor (upgradeable)
  • ZDAS Acquisition and navigational Control Module.
  • NovAtel OEM-5 GPS Units for aircraft positional determination and GPS Base station recording facility.
  • Geometrics Corp G823-B High sensitivity Cesium vapor magnetometer sensor modules.
  • Video Camera and Recorder to allow flight path recording and labeling of video frames with fiducially and position.
  • Omni-Star SatSafe flight following system.
  • Lightweight Radar Altimeter system inc Indicator, Antennae and mounting kit
Specifications:

Magnetic Specifications:

Sampling Interval: 0.05s
Figure Interval: < 2 nT
Total Noise: 0.001 nT
Heading Error: < 2 nT

Applications

Minerals

Magnetic measurements are an integral part of most mining related airborne geophysical surveys. They provide a valuable addition to other data sets such as electromagnetic and radiometric data. As a standalone tool magnetic data has moved far beyond target hunting and can now be used for detailed mapping of geological structures and lithology. Survey parameters such as line spacing and survey height can be tailored to meet client requirements.

Oil & Gas

Improve resolution in magnetometers, sensors and aircraft positioning has resulted in more use being made of airborne magnetic surveys for hydrocarbon exploration. High Resolution Aeromagnetic data is now being used for the detection and detailed mapping of faults and fracture systems throughout the sedimentary section. This is in addition to the traditional task of mapping basement structure and lithology.

Coal

Modern aeromagnetic are increasingly being used in the exploration, feasibility and development stages of the coal mining sector to provide detailed structural (fault) mapping and identification of intrusive volcanic plugs and sills. Accurate mapping of these geological features is extremely important in the initial estimation of calculated reserves and the development and planning of mining methods and associated costs.

Geothermal Energy

The use of aeromagnetic data in the geothermal energy exploration sector is important to create a detailed structural interpretation which assists with accurate placement of geothermal injection and recovery wells.

Geological Survey mapping

For many years various government geological mapping agencies and international aid agencies (eg World Bank) have funded country scale geological / geophysical mapping programs to provide useful and affordable databases designed to encourage exploration investment. These programs have utilized both detailed and regional aeromagnetic as the primary database to encourage this investment.

Geotechnical Engineering

Airborne magnetic data has the ability to accurately map geological structures and lithology. Geotechnical engineering applications include assessing geological stability, earthquake fault zone identification and delineating groundwater control structures.

Equipments

Typically a single magnetometer sensor is mounted on a fixed wing aircraft. As the aircraft flies through the air it measures the magnetic field, attitude of the aircraft, GPS position and altimeter data. An onboard computer records the raw data and corrects the magnetic data for aircraft attitude variations.

The final data is tie line leveled and/or micro-leveled and includes corrections for diurnal fluctuations, IGRF and system parallax.

 Equipment

  • Airborne Magnetometer counter -processor system
  • Real-Time and post processed Magnetometer Compensation Module for single sensor (upgradeable)
  • ZDAS Acquisition and navigational Control Module.
  • NovAtel OEM-5 GPS Units for aircraft positional determination and GPS Base station recording facility.
  • Geometrics Corp G823-B High sensitivity Cesium vapor magnetometer sensor modules.
  • Video Camera and Recorder to allow flight path recording and labeling of video frames with fiducially and position.
  • Omni-Star SatSafe flight following system.
  • Lightweight Radar Altimeter system inc Indicator, Antennae and mounting kit

 Specifications

Magnetic Specifications:

  • Sampling Interval: 05 s
  • Figure Interval: < 2 nT
  • Total Noise: 001 nT
  • Heading Error: < 2 nT