Proof of Trust and Reliability
Good Delivery Referee
TANAKA is working to create a global standard for precious metals.
TANAKA is the only accredited Good Delivery Referee in Japan that assesses accredited precious metal refiners to ensure the quality of globally-marketed precious metals.
TANAKA appointed Good Delivery Referee, demonstrating the world-class standard of its technologies

TANAKA’s appointment as a Good Deliver Referee proves that:


- TANAKA possesses the world-class technologies required to assess producers around the world;
- TANAKA takes the responsibility of ensuring the quality of gold and silver throughout the world; and
- TANAKA can be relied upon, particularly given that it is one of only seven Good Deliver Referees in the world and the only one in Japan.
Production of analytical gold and silver reference samples for solid emission spectrometry

TANAKA plays a central role as an LPPM-approved Good Delivery Referee.

The LPPM, which was established in May 1987 after experiencing precursor’s long history, is the only globally recognized organization in the world that accredits refiners in order to ensure that platinum and palladium transactions are conducted fairly.
In June 2009, the LPPM posted its Good Delivery Rules on its website and launched a re-accreditation system (referred to as “Proactive Monitoring (PAM)”, to follow the same system as LBMA which had been introduced for gold and silver in 2004) for platinum and palladium. As a Good Delivery Referee, TANAKA’s mission is growing in scale.
Platinum and palladium are used as important materials in an even wider range of industrial fields than gold and silver. These fields include the automotive, electrical, and electronic industries, as well as the asset trading markets. Needless to say, given its high-level analytical skills and its advanced technologies and abundant experience in the field of industrial precious metal processing, TANAKA is expected to play an increasingly prominent role in the LPPM.
With its involvement in the LPPM and the core specialties built up over the years, TANAKA remains committed to making a significant contribution to the world.
We undertake contract manufacturing of standardization samples for optical emission spectrometry. Please contact us for further details.

Our Analytical Techniques Support Customer Confidence in TANAKA
We meet customer expectations through the various instruments, techniques, and high-level skills we employ.
As a company dealing with precious metals, we believe that assay values form the foundation of the confidence that our customers and society as a whole have in us. Given this, we continue to strive to improve analytical accuracy and develop new technologies.
Classification of Analysis based on Purpose and Analytical Methods


Towards International Standards
Accredited to ISO/IEC17025
ISO/IEC 17025 is the international standard that defines the general requirements for competence in examination or calibration. TANAKA has obtained ISO/IEC17025 accreditation for its analytical techniques with platinum, gold, silver and palladium, the precious metals it deals with most.
The accreditation encompasses the analysis of metals in gold bullion (36 elements), platinum (40 elements), palladium (40 elements), and silver (37 elements) using an ICP-OES based on JIS H 6310, JIS H 6312, JIS H 6313,ISO 15096, and JIS K 0116 standards.