www.digitalcontrollab.com3701 NW 40th Terrace, Suite 1Gainesville, Florida 32606 USA

MineralScan MillSlicer Polar Plot Toe Position (PMC AG Mill Data)

Real-time ToeAngle

Under-filled Mill

Toe = 149o

Full Mill

Toe = 136o

Note: As the mill fills, the load shifts up on the liner. Toe Angle 0 degrees = 4 mA, Toe 360 degrees = 20 mA

Mill Rotation

Mill Rotation

Bearing Pressure

Mill Power

Water

Outlet Fill Level (green)

Inlet Fill Level (blue)

Shell Fill Level (teal)

Feed (red)

Toe = 149o

Toe = 136o

0o

90o

180o

0o

90o

180o

MillSlicer Toe Position Automatic Control Strategy

Bearing Pressure

Mill Power (black)

Water (light blue)

Feed (red)

Fill Level Signals:Shell

(teal) Inlet (dark

blue)Outlet

(green)

Toe = 152o

Toe = 145o

Basic Automatic Control Strategy:1. Empty mill start-up set-point for Toe Angle = 145o. Enter this set point and start auto-feed control. 2. As the mill fills, observe how bearing pressure & power increase over time (see trends).3A. If power or bearing pressure begin to reach their maximum limits, increase the toe set point. i.e. change toe angle set point from 145o to 147o. This should now reduce the feed and empty the mill.3B. If power or bearing pressure are significantly below their maximum limits, decrease the toe set point. i.e. change toe angle set point from 145o to 143o. This should now increase the feed and fill the mill.

Note: Upon start-up, it is recommended that the operator run the mill in manual control to more quickly bring the mill up to the desired power/pressure operating point and then switch to auto-control.