05 · Quality Control
Measured at four points.
Assayed by someone else.
A chrome plant that cannot close a mass balance cannot tell a client what it did with their ore. Boshoek samples and assays at four points on every circuit, every shift, so yield and recovery can be derived from grades and cross-checked against weighed tonnes. When the two disagree, we fix the measurement before we trust the result.
1
Feed
to spirals, after screening
grade + tonnage
2
Concentrate
the saleable product stream
grade + tonnage
3
Middlings
separately drawn or recycled
grade + tonnage
4
Tailings
the honest test of the circuit
grade + tonnage
How we control it
- Independent assay. XRF at an independent commercial laboratory in Rustenburg, on a certificate.
- Split samples, always. Disputes are settled against physical material, not recollection.
- Stockpiles kept apart. MGN 1 and MGN 2 material stockpiled separately; tolling material segregated end to end.
- Reef class logged per lot. Cr:Fe tells us LG6, MG or UG2 affinity, recorded against the lot.
- Moisture recorded. Dry tonnes are used everywhere in the balance.
Despatch integrity
- Weighbridge control on every inbound and outbound load, reconciled daily.
- Four seals per load — registrations, weighbridge slip, all seal numbers captured.
- Digital capture. Microsoft Teams / Power Platform application, traceable to shift and stockpile.
- Tarped and reconciled both ends. Diesel, plant hours and load sheets on the same system.
The KPIs we run to
Product Cr₂O₃ · Cr:Fe per lot · CaO · mass yield · Cr₂O₃ recovery · tailings grade · sub-45 µm loss · reef class per lot.