Hyperspectral Imaging responds to the increasing demand of the mining industry for better exploration tools. Instant mineral identification is done by spectral signature analysis of improved underground exploration or by drill core characterization. This technology offers fast mineralogy mapping.
Based on Photon etc's hyperspectral technology, the Photonic Knowledge's Core MapperTM delivers a series of monochromatic images at user-specified wavelengths, offering instant in situ on site mineral identification. The Hyperspectral Imager simultaneously analyses five drill core boxes with a spatial resolution of 1mm2 and a field of view of 1.5m2. Spatial resolution is then 900 times better, and field of view is 1666 times wider than any currently available hand-held mineral spectrometer. It can provide fast mineralogy fields mapping services, as high as 1500 drill core meters per day with one imager.
For example, by using the optimized Hyperspectral Imager designed specifically for minerals identification, Photonic Knowledge demonstrated the unique precision of the Core MapperTM to a mine site in the Rouyn-Noranda region (figure 1).
Two drilling holes were dug assessed. Gold analysis performed on the core of the first hole indicated gold values, averaging 5 to 7 grams/ton. The second hole was only partially sampled based on the geologist’s assessment and labelled "of limited interest." No supplementary gold assays were performed on the second hole.
Optical spectra provide crystal field characteristics of transition metals, lathanide, actnides, and spectro-chemical clues on ligand contents. Using the Core MapperTM. Photonic Knowledge identified proper weighting of spectral classes vectorizing the gold mineralization on the first hole. This algorithm was then applied to the second hole and the same gold vectors were identified. Assays were subsequently performed on samples from the second hole yielding from 0.1 g/ton to 0.5 g/ton, averaging 0.2 g/ton on 5 meters illustrating the accuracy and the detection limit of the Core MapperTM as well as the high potential for ore vectorization (figure 2). Although subeconomic, this finding was significant as an indicator of proximity to the main mineralization zone.
Resulting in more than just an increase in efficiency, the Hyperspectral Imager supplies information on both spectral and spatial content, creating new opportunities for analysis, pushing the boundaries of the most demanding applications in mineral identification. Photonic Knowledge’s optimized hyperspectral cube allows for spectral analysis of each and every pixel of a full resolution image, amounting to no more fastidious x-y scanning of the samples.
The Core MapperTM technology affords the mining industry the opportunity to see things never seen before. The precision and speed with which it performs diagnostics of material, physical, or molecular is unparalleled. With a single acquisition, the photonic imaging system discovers gold bearing zones in a way geologists have only dreamed about.