Copper concentrator · Flotation Row 4
LIMS — concentrate grade trending below spec for 6 weeks; assay variability tracked but not flagged to ops
DCS — collector dosing rate manually overridden across 3 shifts; never raised to MOC
Operator notes mention “froth looking off” repeatedly — never opened as work order
lock dosing setpoints under MOC · standardise froth assessment SOP · automated grade alarms with escalation rules