An apparatus for the measurement of ore in mine ore benches or ore stockpiles, the apparatus comprising: a mobile platform, defining a platform zone, wherein the mobile platform is positionable on or above a mine ore bench or stockpile, at least one magnetic resonance sensor (300comprised in the mobile platform, the magnetic resonance sensor comprising: a main loop positionable in the platform zone above or on a mine ore bench or ore stockpile, a drive loop located above the main loop and electrically isolated from and magnetically coupled to the main loop, wherein a radio frequency 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 of the at least one MR sensor relative to the platform zone and/or mine ore bench or ore stockpile; positioning of the main loop and the drive loop relative to each other; 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 mine ore bench or ore stockpile. a mobile platform, defining a platform zone, wherein the mobile platform is positionable on or above a mine ore bench or stockpile, at least one magnetic resonance sensor (300comprised in the mobile platform, the magnetic resonance sensor comprising: a main loop positionable in the platform zone above or on a mine ore bench or ore stockpile, a drive loop located above the main loop and electrically isolated from and magnetically coupled to the main loop, wherein a radio frequency 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; a main loop positionable in the platform zone above or on a mine ore bench or ore stockpile, a drive loop located above the main loop and electrically isolated from and magnetically coupled to the main loop, wherein a radio frequency 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 of the at least one MR sensor relative to the platform zone and/or mine ore bench or ore stockpile; positioning of the main loop and the drive loop relative to each other; 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 mine ore bench or ore stockpile. positioning of the at least one MR sensor relative to the platform zone and/or mine ore bench or ore stockpile; positioning of the main loop and the drive loop relative to each other; 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 mine ore bench or ore stockpile.