Apparatus for the measurement of ore in mine haul vehicles

An apparatus for the measurement of ore in mine haul vehicles, the apparatus comprising:

• a portal, defining a portal zone, wherein a haul vehicle carrying ore is positionable in or movable through the portal zone,
• at least one magnetic resonance (MR) sensor positioned in the portal, the magnetic resonance sensor comprising:
• a main loop positionable in the portal zone above or on an ore burden carried by the haul vehicle,
• a drive loop located above the main loop and electrically isolated from and magnetically coupled to the main loop,
• wherein a radio frequency (RF) transmitter is couplable to a feed terminal of the drive loop to drive an RF drive current in the drive loop and a radio frequency receiver is couplable to the drive loop to monitor an RF response current in the drive loop;
• the apparatus further comprising:
• a magnetic resonance sensor control system configured to control at least one of:
• positioning the at least one MR sensor relative to the portal zone and/or the ore burden;
• positioning the main loop relative to the drive loop;
• electromagnetic suppression characteristics of the at least one MR sensor;
• and/or
• sensitivity of the at least one MR sensor as a function of distance of the sensor from the ore burden.