01 / METALLURGICAL, GEMOLOGICAL & DEPOSIT ARCHIVE
Nigerian Mineral Knowledge Base
Search and filter our curated geological encyclopedia by mineral class, host state, or industrial specification. Select any indexed mineral to inspect its 3D crystallographic model or initiate a sourcing mandate.
02 / METALLURGICAL QUALITY CONTROL
Commercial Export Assay Benchmarks
Standard international off-take grade benchmarks, impurity thresholds, and pre-shipment inspection protocols enforced by ROXCORP.
| Commodity | Target Export Grade | Rejection / Penalty Threshold | Max Moisture | Pre-Shipment Assay Protocol |
|---|---|---|---|---|
| Lithium Spodumene (SC5/DSO) | 5.0% – 6.0% Li₂O (3.5% DSO min) | Fe₂O₃ > 1.5% / Mica > 2.0% | < 3.0% H₂O | SGS / Intertek ICP-OES & Na₂O₂ fusion at mine gate & Apapa port |
| Columbite-Tantalite (Coltan) | 30% – 50%+ Ta₂O₅ | U₃O₈ + ThO₂ > 0.1% (Class 7 Rad) | < 1.0% H₂O | XRF + NNRA radiation clearance certificate (< 1.0 Bq/g) |
| Cassiterite (Tin Concentrate) | 65% – 72% Sn | < 60% Sn / Pb + As > 0.2% | < 1.5% H₂O | Gravity magnetic upgrading + wet chemical / XRF assay |
| Lead-Zinc (Galena / Sphalerite) | 55% – 68% Pb / 48%+ Zn | < 45% Combined Metal | < 4.0% H₂O | SGS composite drum/bag sampling + Ag (Silver) credit assay |
| API Drilling Barite | SG 4.20 – 4.35 g/cm³ (BaSO₄ > 92%) | SG < 4.10 / Soluble Alkaline > 250ppm | < 1.0% H₂O | API Spec 13A specific gravity & particle size verification |