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Magnetic Resonance Analyser

On-Conveyor

The on-conveyor magnetic resonance analyser (MRA) is installed on fixed conveyor belts to provide real-time mineralogical grade measurements of conveyed material. Real-time grade data is most commonly used to implement bulk ore sorting, but can also be used for process optimisation or ongoing geological model optimisation.

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Mineral concentrations measurements are carried out using cutting-edge magnetic resonance technology, proven to deliver the fastest and most accurate bulk mineralogical measurement of any technology.

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Customised to Fit

MRA sensors are customised to fit the target conveyor belt and ore type.

MR analysers are tuned to priority minerals, typically this is either the primary economic mineral(s) or deleterious minerals. MR is able to deliver high precision grade measurements of 100% of the material conveyed on the belt in as little as 1-2 seconds.

Check here [/link to /technology/mag_res_tech/] for a list of available mineral targets.

MR analysers are designed for high throughput applications where tonnages exceed 100 tonnes per hour and for belts wider than 600 mm (23″). Typical throughputs are between 400 – 5,000 tph.

To minimize mixing, MR analysers are typically installed on conveyors carrying primary crushed ore. The long wavelength radiofrequency signal used in MR is able to deeply penetrate solid rock, measuring the full bed-depth and through all large particles.

Largest particle top size is typically no more than 1/3rd of the belt width, to ensure particles do not fall off the conveyor belt.

MR analyser opening size is designed with a healthy space above the ore to avoid particle collisions with the sensor.

Shielding protects the sensor from intermittent tramp metal or mining debris carried with the ore.

One-Time MR Calibration

The MR radio signal is tuned specifically to the signature resonant frequency unique to the target mineral and no other. There are no “false positives” from other minerals or elements, so no calibration adjustments are required for changing ore composition regardless of host-rock, intermittent presence of trace elements, varying moisture content or particle size distribution.

The MRA is calibrated in the factory using a standard sample prepared using ore or concentrate from the client’s mine site. After assembly on site, the standard sample is used to confirm the calibration. No ongoing re-calibration is required, and the standard is used only after installation and major repairs or component replacement.

Safe Radio Technology

MR measurement relies on non-ionizing, radiofrequency electromagnetic radiation similar to the frequency band used for aerial TV or radio. This radiofrequency field is transmitted and received by an antenna in the MRA sensor core.

Electromagnetic radiation consists of waves of electric and magnetic energy moving together (i.e., radiating) through space at the speed of light. Taken together, all forms of electromagnetic energy are referred to as the electromagnetic “spectrum.” Radio waves and microwaves emitted by transmitting antennas are one form of electromagnetic energy.

Further safety information on RF radiation can be found on the US FCC website here.

The MRA uses integrated shielding and electrical interlocking switch systems to adhere to the strictest RF and electrical safety standards for use on mine sites in close proximity of personnel.

Scope of Supply

MR Analysers are designed to easily retrofit to existing or new conveyor belts. The sensor is designed to be installed in parts over a single shutdown of no more than 12 hours and without splitting the conveyor belt.

Equipment

NextOre supplies the MRA sensor and electronics container.

Connections

The customer must supply a source of power and analogue connection to a belt scale nearby the MR sensor.

Data

Data produced by the analyser can either be linked to a local SCADA/DCS system directly using MODBUS TCP/IP or to cloud reporting via secure Microsoft Azure cloud data.