Standard Testwork Methodologies for Sensor-Based Particle Ore Sorting Project Development and Process Optimization

Sensor-based Particle Ore Sorting (POS) has gained significant acceptance as a unit process in mineral processing in recent years, particularly in the diamond, copper, tin, and tungsten sectors. The increased uptake has led to a steady increase in testwork volume since 2010. Testwork is the basis for all technical and financial evaluation of a potential business case for POS. To support the growing volume of POS testwork, this contribution develops standardized test methodologies and sampling requirements for different project stages. Our aim is to bridge the understanding and terminology between the various technical disciplines involved. This allows all stakeholders to enter the complex realm of POS with full transparency. Tests can be conducted using three different feed types: endmember samples, lithotype samples, and composite samples. Four testwork methods are presented for POS project development and optimization: Single Particle Test (SPT), Bench Scale Test (BST), Cascade Test (CT), and Process Test (PT). From the possible combinations, this results in ten POS testwork methods. Each test type serves a different purpose with regard to process effectiveness contributions and relationships to the project lot, serving specific roles during project stages from scoping to feasibility. Specific project parameters are recommended to be defined up front for future POS projects to improve clarity and interpretation of test objectives, limitations, and results.