Audit

The industry standard gravity recoverable gold (GRG) test provides a performance benchmark.

Grinding efficiency remains at the core of every circuit.

It is rarely an issue that gravity circuits (i.e. water balance) negatively affect SAG, Ball or Impact Mills (VSI)

Hydrocyclone efficiency is the main lever to grinding and gravity optimization.

The cyclone U/F to O/F gold grade ratio is a simple and practical metric for determining gravity opportunities. Screen classification guards the gravity concentrator from excessive wear, but classification size has little impact on metal recovery.

While centrifugal gravity concentrators operate best in closed circuits with hydro classification, treating cyclone feed or cyclone underflow, open circuit options (cyclone overflow) exist in certain applications.

Batch concentrators prove inherently difficult to optimize through sampling campaigns. An understanding of operations and maintenance best practices are practical optimization pathway.

A comprehensive audit includes downstream gravity upgrading (tabling) or intensive cyanidation assessment