Inspection, Testing & Assaying
Mine, warehouse and stockpile inspection in Africa
A deposit is often asked for material no one on the buyer’s side has seen. Our inspectors go in your place — to the mine, the warehouse or the stockyard — establish that the operation exists and the material is there in the quantity claimed, record it with their own dated photographs, sample it where required and, when it ships, witness the loading.

Scope
- Turnaround
- Attendance usually within three to seven days at or near our bases; elsewhere as set in the scope. Report within two working days of the visit.
- Coverage
- 7 countries, and anywhere in Africa
- Standards
- Inspection to the requirements of ISO/IEC 17020; laboratories accredited to ISO/IEC 17025
Inspectors are stationed in Tanzania, Kenya, Uganda, Zambia, the DR Congo, Ghana and Sierra Leone and deploy across Africa. At a mine, they confirm that the site is worked, that it lies within the licensed area, and that its scale is consistent with the volumes offered. At a warehouse or stockyard, they count, weigh and identify the lot, record its condition and marks, and seal it.
All evidence is gathered by our inspector. Photographs and video are dated and located, and supplied images from the seller are never used. Where the scope includes testing, samples are drawn by our inspector, sealed and sent to an accredited laboratory.
Where a site calls for specialist judgement — the geology of a deposit, the capacity of a processing plant — inspectors are accompanied by geologists or mining engineers from our network.
Typical situations
- Before paying a deposit on material you have not seen
- Instead of travelling yourself to a mine or warehouse
- At loading, so the lot inspected is the lot that ships
- When a financier requires an independent inspection before releasing funds
Method
Our testers and inspectors are based in Tanzania, Kenya, Uganda, Zambia, the DR Congo, Ghana and Sierra Leone, and deploy with XRF analysers wherever in Africa the material is held.
- STEP 01
Brief
The site, the material, the quantity claimed and the questions the inspection must answer.
- STEP 02
Access agreed
Access is arranged with the site operator; refusal of access is itself recorded as a finding.
- STEP 03
Site attendance
The inspector attends on the agreed date and records the site, the operation and the material.
- STEP 04
Count, weigh, identify
Units are counted, weighed or measured, and marks, lot numbers and condition recorded.
- STEP 05
Sample and seal
Where in scope, samples are drawn and the lot sealed with numbered seals.
- STEP 06
Loading
On request, the inspector returns to witness loading and seal the containers or trucks.
Scoping is free. We return a scope, timetable and terms within one business day.
Request this service
Detail
What we check at a mine
- That the site is being worked, and by what method — artisanal, semi-mechanised or industrial
- GPS position of the workings, checked against the licensed area on the cadastre
- Processing equipment and its capacity, compared with the output claimed
- Stockpiles, production records and dispatch records where available
- Workforce, access and security arrangements, as observed
What we check at a warehouse or stockyard
- That the material is present, and in the quantity claimed
- Count of units — bundles, bags, drums or bars — and weighing on a calibrated scale or weighbridge
- Marks, brands, lot numbers and tags, recorded against the documents
- Packing and condition, including signs of tampering or mixing
- Confirmation from the warehouse operator of who deposited the material and in whose name it is held
Materials we inspect
Gold in all forms; copper cathodes, concentrate, wire and scrap; cobalt hydroxide; tin, tantalum and tungsten ores; manganese, lithium-bearing ores and other industrial minerals. For each, the inspection follows the practice of the trade — for example brand and grade checks on cathodes, moisture and assay sampling on concentrate, and grading against recognised scrap specifications for wire and scrap.
Checks specific to each material
- Copper cathode — brand and producer marks, bundle count, bundle weights, physical condition and signs of re-strapping; grade read by XRF and, where the contract requires, samples for chemical analysis
- Copper and cobalt concentrate or hydroxide — bag or bulk count, weighing, sampling across the lot by an agreed method for assay and moisture
- Copper wire and scrap — grading against the specification in the contract, inspection for insulation, plating, contamination and mixed grades before baling
- Tin, tantalum and tungsten ores — bag count and weights, tags and seals reconciled with the traceability documents, sampling for assay
- Gold — piece count, weighing and three-method testing, as under our gold testing service
Witnessed loading
Most substitution happens between inspection and shipment. At loading, our inspector checks the material against the inspection record — counts, marks, seal numbers — observes it being loaded, records each container or truck number, applies numbered seals and photographs them in place. The loading record is issued on the day, so the documents for payment can reference it.
Preparing for an inspection
Tell us the exact location, the name of the person who will receive the inspector, the quantity and form of the material, and the documents that describe it. The site should agree in advance to counting, weighing and, if in scope, sampling. Where a weighbridge or calibrated scale is on site, we record its calibration; where there is none, we bring or arrange suitable equipment and state the method in the report.
Remote and difficult sites
Many artisanal and small-scale sites are reached by unpaved roads, and some lie in areas where security conditions change quickly. We plan access, transport and local liaison before the date, and where a site cannot be reached safely we say so, propose an alternative — inspecting at the point of aggregation, or at the warehouse before export — and record in the report what could not be seen.
Inspections for financiers, insurers and auditors
Lenders against stock, trade financiers and insurers often need to know that collateral exists, where it is, and in what condition, at the time funds are released or cover is bound — and again at intervals. We carry out single and periodic stock inspections to a scope the financier sets, report directly to the financier where the client agrees, and keep the same identification and seal references from one visit to the next so that movements can be traced.
What the report contains
- Site identity, date, time, GPS position and the people present
- Description of the operation and its observed scale
- Count, weights or measurements of the material, with method
- Marks, lot numbers and condition, reconciled to the documents
- Dated and located photographs and video taken by our inspector
- Seal numbers and, where in scope, sample numbers and laboratory
- Loading record with container or truck numbers, where requested
Deliverables
- An inspection report on the site, the operation and the material
- Dated, located photographs and video taken by our inspector
- Counts, weights, marks and seal numbers, reconciled to the documents
- Samples sent to an accredited laboratory, and a witnessed-loading record, where in scope
Turnaround. Attendance usually within three to seven days at or near our bases; elsewhere as set in the scope. Report within two working days of the visit.
Why clients choose us
- Our own inspectors attend; we do not rely on photographs supplied by the seller.
- Standing teams in Tanzania, Kenya, Uganda, Zambia, the DR Congo, Ghana and Sierra Leone, deployed across Africa.
- Geologists and mining engineers available when the site requires them.
- Nairank Global is independent of buyers and sellers. Its fees are outcome-neutral: they are the same whether or not the transaction proceeds. Our fee is agreed before work starts and is the same whatever we find.
Questions
Not answered here? Message the desk.
Where can you inspect?
Anywhere in Africa. Our inspectors are based in Tanzania, Kenya, Uganda, Zambia, the DR Congo, Ghana and Sierra Leone, and deploy to other countries on a date set in the scope.
Do you use the seller’s photographs?
Never. Every photograph and video is taken, dated and located by our inspector.
Can you confirm that a mine is inside its licensed area?
Yes. The inspector records GPS positions of the workings, which we compare with the licence boundaries held by the cadastre.
What if the seller refuses access?
The refusal is recorded and reported. A supplier who will not allow an inspection of material it is offering for sale is itself a finding.
Can you witness loading?
Yes. The inspector returns at loading, confirms the material against the earlier inspection and records container or truck numbers and seals.
Do you take samples?
Where the scope includes testing, samples are drawn by our inspector, sealed and sent to an accredited laboratory, which issues the certificate to you.
How soon can you attend?
Usually within three to seven days at or near our bases. Remote sites and other countries are scheduled in the scope.
Does an inspection prove the seller owns the material?
No. It proves the material was present and in what condition. Ownership and authority to sell are confirmed separately, for example with the warehouse operator or the licensing authority.
Which materials do you inspect?
Gold, copper in all forms, cobalt, tin, tantalum, tungsten, manganese, lithium-bearing ores and other industrial minerals.
Can you inspect several sites in one engagement?
Yes. Multi-site inspections are planned as one programme, with one report or one per site as you prefer.
Can you report directly to our bank or insurer?
Yes, where you agree. The scope names the recipients, and periodic inspections keep the same lot and seal references from visit to visit.
Where we provide this
City and country pages with local detail: where our teams work, the authorities involved and how an engagement runs there.
- Gold testing in MwanzaTesting at Lake Zone mineral markets, dealers and refineries, with witnessed melts and fire assay.
- Gold testing in GeitaGold tested at source in Geita, with inspection of the producing site and sealed lots.
- Gold testing in LusakaGold testing in Lusaka with site inspection in the provinces and seller checks.
- Gold and copper testing in LubumbashiGold testing and copper and cobalt sampling in Haut-Katanga and Lualaba, with warehouse inspection.
- Gold testing in AccraGold testing and GoldBod and Minerals Commission licence checks for buyers in Ghana.
- Gold testing in FreetownGold testing in Freetown and the provinces, with NMA licence and CAC company checks on the seller.
- Supplier due diligence in ZambiaPACRA, cadastre licences, warehouse inspection and sampling.
- Supplier due diligence in the DR CongoRCCM, CAMI, CEEC, inspection and OECD-aligned evidence.
- Gold testing and supplier due diligence in Sierra LeoneCAC record, NMA mining, dealer and exporter licences, export documents, inspection and gold testing.
Related practice areas
Copper & Base-Metal Sampling and Lab Testing
Gold Testing & Assaying
Document & Certificate Verification
Field guidance
Country pages and buyer guides where this work applies.
- DR Congo — Bunia, Kinshasa, LubumbashiGold testing and seller checks against RCCM, CAMI, the comptoir licence and CEEC certification.
- Zambia — Lusaka and the CopperbeltCopper inspection and sampling on the Copperbelt, gold testing in Lusaka, PACRA and Mining Cadastre checks.
- West Africa — Ghana, Sierra Leone and beyondField teams in Ghana and Sierra Leone, deployed across West Africa, with checks against national rules such as GoldBod licensing.
- Copper suppliers in ZambiaPACRA, the Mining Cadastre, export permits, cathode brands and concentrate sampling — what to check before buying Zambian copper.
- Genuine copper suppliers in the DR CongoRCCM, CAMI, export authorisation, OCC inspection and non-radioactivity certificates — how to confirm a Congolese copper seller.
- Due diligence in Africa: registry vs groundWhat a company registry proves and what it does not, and how each claim is matched to the cadastre, the licence, the warehouse and the goods.
Mine, Warehouse & Stockpile Inspection
Brief us on the requirement and the location. We return a scope, a timetable and terms within 24 hours, in confidence.