RE: Trades25 Mar 2026 16:51
Open pit copper mining uses Xrf all the time for obvious reasons - they want to keep digging, selecting, and not sending off to a Lab for assays.
Depending on the set up e.g.
1. Handheld/portable XRF analyzers: Geologists or technicians regularly scan blast hole samples, drill cores, stockpile faces, or truck loads on the ground. This helps with quick on-site grade estimation, delineating ore vs. waste boundaries, and deciding where to dig or send material. It's fast, requires little sample prep, and is widely used for copper and associated elements (e.g., in porphyry deposits).
2. Shovel-mounted or excavator-mounted XRF sensors: These are installed on the loading equipment (shovels or excavators). As the bucket digs and loads the truck, the sensors scan the material in real time using high-speed XRF. This provides immediate grade data (copper content, etc.) so operators or dispatch systems can direct the haul truck to the correct destination—high-grade ore to the mill, low-grade to a stockpile, or waste to a dump. This is a growing technology specifically for open-pit operations to reduce dilution and improve blending.
3. On-belt or conveyor XRF analyzers: After material is dumped from trucks (often after primary crushing), online XRF systems scan the flowing ore on conveyors. This gives frequent grade readings (sometimes multiple per truck load) for better process control, ore sorting, or feed monitoring before it reaches the mill. One example from a nickel-copper mine analyzed crushed material right after the primary crusher, providing ~5 analyses per large dump truck load
It's very good technology these days and very accurate.