FAQ

FAQ 2018-01-11T15:19:17+00:00

Frequently Asked Questions

Will the presence of magnetic or paramagnetic material interfere with the MR measurement? 2018-01-02T09:27:12+00:00

No it will not, the MR measurement is tolerant of high levels of magnetic minerals such as pyrrhotite and magnetite.

Does the feed material need to be washed or otherwise specially prepared for reading? 2018-01-02T09:28:15+00:00

No. Because the MR measurement is a true bulk sensing technology, surface conditions of rocks, such as wet surface or caked-on dust, do not affect the measurement. The method is insensitive to ore particle size variation.

Can MR sensing be configured to measure more than one target mineral? 2018-01-02T09:28:37+00:00

Yes, the MR Analyser can be configured for simultaneous detection of multiple minerals, if required.

How is the MR sensor calibrated and how often is calibration required? 2018-01-02T09:28:57+00:00

Because the MR technique is insensitive to ore “matrix” effects, calibration is very straightforward and an extensive calibration campaign is not required. The MR Anlayser is shipped with a factory calibration, which can be refined at site with static testing of a single standard sample. Once calibrated, the MR Analyser does not require periodic recalibration unless major conveyor belt variations are performed.

What is the smallest quantity of material that can be selectively sensed and rejected through sorting? 2018-01-02T09:29:23+00:00

For sorting at tonnage rates at a few hundred tonnes per hour, the minimum sorted mass can be less than 100kg. For higher tonnage operations, a more practical sortable mass increment is between 1-10 tonnes. NextOre can provide an estimate of the minimum sorted mass achievable in an application using basic client information relating to conveyor conditions.

Can you estimate grade uplift and waste material rejection for a target mining project? 2018-01-02T09:29:57+00:00

Yes. By specialised analysis of core drill data at 1m – 2m resolution, NextOre can build a prediction of the “sortability” of an operation and the likely grade uplift, also taking into account the specific mining process in a Client application. NextOre’s models of grade uplift can be fed into a detailed techno-economic analysis, specific to a Client operation, to inform the economic case for sorting.

Can I send a test sample of material to be measured by an MR sensor? 2018-01-02T09:30:26+00:00

Yes, NextOre is able to test mineral samples in amenability testing. The MR technology is insensitive to lithology and mineralised style, but amenability testwork can be performed to doubly confirm this for specific applications. Note that NextOre has experience in amenability testing of many minerals in different deposit styles already, and can confirm detection capability without the need for extensive testwork.

If a mineral is not listed in the “Target Minerals” section, what does that mean? 2018-07-05T12:21:59+00:00

The “Target Minerals” section shows some of the major ore minerals amenable to MR detection. Many other minerals (too many to list) can also be measured with the MR Analyser, especially selected copper, arsenic, antimony and iron minerals. Please contact NextOre for more information on specific mineral detection capability.

How quickly is a grade measurement returned? 2018-01-02T09:31:28+00:00

This depends on the targeted mineral, chosen grade cutoff and specific conveyor application. However, for selected minerals like chalcopyrite and other iron and arsenic minerals, accurate grade measurement well below typical cutoffs can be performed in seconds.

How safe is the use of MR sensing? 2018-01-02T09:31:47+00:00

Operating the MR Analyser is roughly equivalent to the use of a [microwave]. The MR analyser uses radio waves, which is a form of non-ionising radiation that is very easy to shield with thin metal sheets (unlike technology that uses ionising radiation). The MR Analyser has lightweight metal shielding that provides radio levels well below public safety limits immediately next to the Analyser.

Can the MR sensor be installed on an existing belt? 2018-01-02T09:32:12+00:00

Yes. The on-belt components have lightweight modular design that slip into position between idlers and the belt return, or can be mounted directly onto horizontal stringers, for retrofit application. Based on basic client conveyor information, NextOre can provide modest customisation to the on-conveyor modules to minimise or completely eliminate any additional works required for conveyor structure modification.

If an MR sensor were installed on an existing production belt, how much downtime is required for installation? 2018-01-02T09:33:03+00:00

One scheduled shift with pre-planning and on-site fitter support is all that is usually required to mechanically mount the on-conveyor components of the MR Analyser.