The real-time, quantitative analysis of ores to determine their elemental composition is crucial for applications such as ore-sorting and grade control. For hard rock mining, implementations of ore sorting prior to concentration are limited by the ability of measurement techniques to be reliably implemented on large conveyor belts. X-ray and optical based measurements, such as laser induced breakdown spectroscopy and infra-red reflectance are limited to the analysis of the surfaces of samples which render them unable to measure through the bulk of the ore. This introduces significant sampling errors which can affect the ability of the method to facilitate ore sorting and grade control. Nuclear magnetic resonance (NMR) is a radio-frequency spectroscopy that can directly detect certain nuclei within an ore sample for the purpose of grade quantification. The operating frequency of the NMR measurement is typically less than 30 MHz for industrial applications which allows for the full penetration of the ore allowing for a bulk analysis all the way up to the scale encountered on primary conveyor belts. NMR utilises non-ionising radiation making it safe and free from significant regulatory oversight for implementation at the mine site. This work presents laboratory results on the NMR analysis of a number of lithium pegmatite ores. a commercial sample of high-grade spodumene was also analysed. The NMR results were compared to quantitative X-ray diffraction (XRD) analysis which showed excellent correlation. Initial results from a scaled-up prototype, large enough to reside on a small conveyor belt, show that reasonable measurement times for the quantification of spodumene can be obtained demonstrating the feasibility of the method for ore-sorting and grade control at the bulk scale.