Managing Contamination Risk: Granulometric Sieve Audits and Pulverizer Cleanliness

The Critical Nature of Sample Preparation

Over 80% of total assay variances originate during sample reduction, not instrumental finish. Inadequate pulverization or carry-over cross-contamination between high-grade nuggets and low-grade blanks invalidates downstream analysis.

Laser & Mechanical Sieve Audits

RVA Labs conducts routine granulometric screening audits on 1 in every 20 samples processed through our LM2 ring mills. If fewer than 85% of particles pass through a 200-mesh (75 μm) screen, pulverization time is dynamically adjusted to ensure homogeneous analytical splits.

Barren Quartz Wash Protocols

Between every batch—and immediately after visual massive sulphide or quartz vein core—crushers and pulverizer bowls undergo a clean cycle with barren coarse quartz, ensuring zero carry-over into subsequent exploration samples.