Abstract: Method and apparatus are provided to select target metal particles from aggregate ore. A feed stream of aggregate is directed along a path and a higher density portion is segregated therefrom. Detectors are arranged in-line and along the flow of the higher density portion. High resolution detection of a target particles within the feed stream triggers ejection of a select portion of the feed stream and target particle as a concentrate and the balance continues to a further phase of detection/ejection. The concentrate is processed in further stages or collected as product. Multiple parallel detector/ejectors across the path can isolate target particles and minimize the ejected gangue portion associated therewith. Dry or hydrodynamic transport of the feed stream is available determined by aggregate characteristics. A compact footprint of the apparatus is achieved with arcuate paths and multi-level conveyance whilst low energy requirements enables use in artisan installations.