BVM-03 Borehole Vector Magnetometer

The BVM-03 contains a high sensitivity three-component fluxgate magnetometer and two-axis tiltmeter to provide measurements used in vector magnetic and borehole orientation surveys. Additionally the probe includes a magnetic susceptibility sensor. This sensor is a low frequency induction sensor with a range from 10uSI to 2SI units. All sensors are mounted in a non-magnetic housing, that is pressure rated to 1500 or 3000 meters. All functions within the probe are controlled by an on-board microprocessor, which samples each sensor twice every second, and transmits a digital record up-hole along the four conductors logging cable to the

digital data interface.

Each component of the magnetic field is sampled over 0.5 seconds to a sensitivity of 0.1nT. The 2-axis tiltmeter provides an accurate value of the borehole dip from 0 (vertical) to 85^o.

Its 40-mm outer diameter permits use of the BVM-03 in small hole drilling programs typical in the mining industry. A complete copy of all measurements is recorded that permits further analysis in area of high magnetic gradient, which are often associated with mineralization.