Passive sonar flow technology, utilized for over 17 years in some of the world’s most extreme environments and challenging process applications, is the newest flow measurement technology since the introduction of the vortex, Coriolis, and ultrasonic flow meters introduced in the 1960’s and early 1970’s. Passive sonar flow technology, engineered for a wide range of multi-phase and single-phase flows, is especially well-suited for erosive and corrosive slurry flows, such as in the mineral processing industry, since the flow meter installs and measures from outside of the process pipe and therefore does not contact the process media. The ability of the sonar technology to passively measure flows from the outside of the pipe, enables unprecedented measurement performance and reliability in highly aggressive slurries and fluids which, virtually eliminates maintenance costs associated and process downtime experienced with traditional slurry flow technologies such as the electromagnetic flow and ultrasonic meters.