Utilizing the isotopic and trace element fingerprint of sphalerite for traceability applications

Purpose and goal

The project aimed to compile a database of trace element and isotope composition of sphalerite from Zn-producing mines in Sweden. The database would then be studied using multivariate analysis to identify the analytical fingerprints for sphalerite from various deposits. The project would thus develop independent traceability criteria which can be used to validate results based on other techniques, such as blockchain analysis, or to evaluate materials where blockchain analysis is not available.

Expected results and effects

The project has established a database of the isotope composition of sphalerite from producing mines in Sweden, and used metal isotope- and trace element ratios for traceability applications. Expected effects are support criteria for certification of Zn concentrate from Swedish mines and improved background data regarding isotopes and trace elements for tracing mine-related contaminants. The result was that powerful parameters for work methodology in traceability were identified, as well as key areas for a subsequent innovation project.

Planned approach and implementation

An inventory of samples from previous studies, as well as supplementary sampling in collaboration with the industrial partners, was carried out to ensure a complete set of representative samples from different ore types. Isotope- and geochemical analyzes were then performed and the results were compiled in a database. Data have then been analyzed using multivariate methods, and compared with published data on deposits globally.