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 (MR) 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 (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 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 (MR) 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 (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 ; 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 (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 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 . <EOS>