Ore veins and mining values depend on gold ore grades. The precious metals mining industry—including gold, silver, and platinum—faces challenges in achieving high recovery rates of high-grade concentrates. The primary methods to determine gold ore grades are the hydroquinone volumetric method and fire assay. However, these techniques are strict with operation, technology and testing conditions. The conventional methods pose environmental hazards due to the use of large amounts of toxic chemical reagents. PURERAY's precious metal analyzers can quickly and accurately detect gold in crude ores, tailings, the pregnant and barren solutions, as well as cyanide leach solutions.