Lawful origin, careful documentation.

1. Lawful origin. We do not buy material with suspicious origin, signs of theft, inconsistent history, or sellers who cannot explain provenance. This filter comes before any technical analysis.
2. Documentation case by case. NF-e where due, process datasheet, lot identification, proof of material origin. We do not require unnecessary bureaucracy from a private seller with one piece; we do require full documentation for industrial lots.
3. Photos and traceability. Every lot recorded with photos of the material, the storage location, the scale weight and the stamped code where applicable. Message history preserved.
4. Protocol-based sampling. For lots that warrant assay, documented sampling with collection points, quartering and final aliquot quantity. Counter-sample archived on request.
5. Chain of custody. Sample sealed at collection, tracked transport to the laboratory, cross-identification between physical sample, photos and report. The number must defend a commercial decision.
6. Qualified partner laboratories. We do not run ICP-MS in-house. We coordinate with partner laboratories chosen by matrix (catalytic, mineral, pharmaceutical). Reports linked to the collected sample.
7. Confidentiality and NDA. We do not disclose origin, volume or supplier identity without authorisation. NDA available on request for larger operations before exchange of sensitive information.
8. Material we do not accept. Suspicious origin; scrap with no PGM/Au/Ag fraction; material with regulatory risk outside scope (radiation, controlled biological contamination, controlled equipment without documentation); very small unidentified volumes.
9. Due diligence proportional to risk. Simple operation (one piece with clear origin, known workshop) has a simple flow. Large operation, international lot, mining offer received by message: layered due diligence — field, documentary, legal review by the buyer.
10. Protection for buyer and seller. Careful documentation is not only about regulators. It is also so the seller can defend the price received and the buyer can present a validated lot to its recovery channel. Clean provenance accelerates business.

For larger industrial operations, international partnerships and mining due diligence, an NDA is available before the exchange of sensitive technical or commercial information. Simple bilingual PT/EN form, adjustable case by case.

For simple operations (one piece, known workshop, identified seller), an NDA is not necessary — the operation is recorded in the WhatsApp or form flow itself, with implicit confidentiality.