Alfred H Knight (AHK) is a market leading independent provider of inspection and testing services for the metals, minerals and solid fuels industry. Our network of laboratories and offices have been strategically positioned to provide our clients with a comprehensive range of services, complemented by fast, accurate communication.

Throughout our business, AHK maintains rigorous quality standards to ensure that all our operations provide the highest level of services to our clients. This is achieved through compliance with industry standards and regulations, accreditations from external agencies including ISO/IEC 17025:2005 and ISO 9001:2015, and in-house quality standards.

We specialise in a wide range of commodities within base and minor metals, precious metals, platinum group metals, catalysts, ferro alloys, steel raw materials, industrial minerals and fertilisers.

Through our wholly owned subsidiary, Knight Energy Services (KES), we are also a leading provider of inspection and testing services for the global coal, coke and biomass industry.



Technical Consultancy

Base & Minor Metals

We have extensive experience in all base and minor metal ores, concentrates, secondary materials and metals such as copper, lead, zinc, tin, nickel, tungsten, titanium, cobalt, chrome, manganese and molybdenum.

AHK is an approved assayer with the London Metal Exchange (LME) and the New York Commodity Exchange (COMEX). AHK is also an active member of the following associations:

  • Minor Metal Trade Association (MMTA)
  • International Molybdenum Association (IMOA)
  • Tantalum-Niobium International Study Centre (TIC)

Precious & Platinum Group Metals

With a presence at the world’s major precious metals refineries, we are able to offer extensive and varied inspection and sampling services for commodities such as dore bullion (gold and silver), concentrates, alloys, metals, complex PGM bearing refinery sweeps and residues, electrolytic slimes and electronic scrap.

Due to the complex chemistry and high intrinsic value, we provide an extensive range of analytical methods to obtain the required precision and accuracy.

AHK is a member of the International Precious Metals Institute (IPMI).


Precious Metals Bearing Catalysts

AHK provides inspection and supervision of weighing and sampling at refineries and recycling plants, and subsequent chemical analysis at our independent laboratories for clients involved with fresh, spent, reforming and refining catalysts commonly used in oil refineries and the automotive trade.


Ferro Alloys & Steel Raw Materials

Ferro alloys are often traded under strict specifications and have the potential to be physically and chemically heterogeneous.

We have the global presence and experience necessary to inspect, sample and analyse these materials including chromium, molybdenum, manganese, nickel, titanium, tungsten, silicon and vanadium alloys.

Our industry specific expertise supports our client’s requiring pre-shipment or purchase quality inspections, tally control, loading and discharge supervision, physical and chemical testing of chrome, manganese and iron ores.


Industrial Minerals

AHK is well placed to fulfil our clients’ requirements involved with these non-metallic minerals, providing specialists services for bulk stockpiled and packaged shipments, including inspection, supervision, weighing, sampling and analysis.

Typical materials include fluorspar, drilling fluid minerals, refractories, mineral sands and rare earths.



We provide a comprehensive range of services to the fertiliser trade, including the implementation and management of quality and quarantine inspection systems for bulk fertiliser shipments.

Our team of highly experienced personnel operate these specialist services at production plants, warehouses, trans-shipment locations and loading ports, including vessel inspections.


Coal, Coke & Biomass

Information about our Solid Fuels services can be found here

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