DISTRIBUTION AND BEHAVIOUR OF SE AND TE IN VOLCANOGENIC MASSIVE SULFIDE (VMS) SYSTEMS

Lead Research Organisation: Cardiff University
Department Name: School of Earth and Ocean Sciences

Abstract

DISTRIBUTION AND BEHAVIOUR OF SE AND TE IN VOLCANOGENIC MASSIVE SULFIDE (VMS) SYSTEMS

Planned Impact

We have fully engaged with stakeholders and beneficiaries from the outset, and used the catalyst stage to develop relationships with industrial, governmental and NGO partners. They have helped shape the research plan by exchange of knowledge, strategic plans, and problems. Key issues they raised have allowed us to identify knowledge gaps addressed in the Case for Support:
* Identification of potential resources (lack of data & predictive models)
* Low current value requires low cost production
* Lack of rapid analytical capability with the requisite detection limits
* Dependence on energy intensive smelting and refining of base metals as the dominant source of supply
* How to process alternative ores for recovery
* Lack of well understood mass flows in recovery operations, and thus a lack of optimisation
* Their deleterious role in the recovery of gold from ores
Our research covers four areas of impact outside the scientific community:
1 Identification and discovery of alternative sources of Se and Te. Beneficiaries will include BGS, USGS, Geological Survey of Cyprus and Geological Institute of Romania - NATIONAL AGENCIES with the responsibility to advise government on resource statistics and policy and to provide impartial advice to industry, academia and the public. Our research will enable them to provide improved Te and Se resource statistics and more realistic estimates of future supply to manufacturers, qualified by a sound understanding of the feasibility of extraction and processing. PRIVATE SECTOR COMPANIES who will benefit include those who are already mining Se and Te-rich material but with little understanding of the location of these elements in their deposits and how to recover them; and those actively exploring for new deposits that could include Se and/or Te as a co-product. Our partners include Platina, Vale, Glencore, AngloGold Ashanti and Scotgold. Our research will provide: 1) data on the occurrence of Te and Se in crustal systems; 2) data for companies to perform a cost-benefit analysis for recovery of Te and Se currently mined, and 3) process-based predictive models for the efficient discovery of new economic deposits of Te and Se. One of our UK study sites is a SSSI owned by Leicester City Council and managed by Natural England. These PUBLIC SECTOR ORGANISATIONS will benefit through enhanced scientific understanding of the site, helping them promote its value to the general public.
2 Improved analytical and geometallurgical characterisation techniques. Beneficiaries will be PRIVATE SECTOR COMPANIES who are mining Se and/or Te bearing ore, including AngloGold Ashanti, Mandalay Resources, and Glencore, who will use our results to develop geometallurgical models for Se and Te to improve their recovery along with associated metals. Olympus will benefit through becoming a world-leader in the use of portable instruments for Te and Se determination in grade and mill control.
3 Environmentally benign, low-cost extraction techniques. This will benefit PRIVATE SECTOR COMPANIES who process ores, including partners 5NPlus, Mandalay Resources, AngloGold Ashanti and Scotgold. They will gain economic advantage through our research on new low-energy, low-environmental impact, locally-based extraction, demonstrated at pilot plant scale. The WIDER PUBLIC gain through continued access to, and reduced CO2 footprint of, modern technologies.
4 Strategic knowledge of security of supply. Beneficiaries will be GOVERNMENT AGENCIES who advise on resource strategy (BGS, SOPAC and especially through integration with USGS parallel programs), and POLICY MAKERS IN INTERNATIONAL GOVERNMENT planning future clean energy strategies. PRIVATE SECTOR end-users of Se and Te will benefit through improved integration of their supply chain, security of supply confidence, and direct contact with producers. The WIDER PUBLIC gain through development of sustainable environmental technologies to support a low-carbon society.

Publications

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Studentship Projects

Project Reference Relationship Related To Start End Student Name
NE/M011615/1 01/06/2015 28/02/2020
1668705 Studentship NE/M011615/1 01/10/2015 31/05/2019 Andrew Martin
 
Description This research aims at constraining the distribution and enrichment to critical elements tellurium (Te) and selenium (Se) in volcanogenic massive sulfide (VMS deposits). These mineral deposits form on the seafloor as black smoker vents today. This research characterises the distribution of Te and Se on a mineral, local and regional scale to better understand factor that lead to the enrichment of Te and Se.

Key findings include:
- Identifying the mineral scale partitioning behaviour of Te and Se between different sulfide minerals.
- Local scale mound controls include temperature and the co-precipitation of different sulfide minerals
- Fluctuating redox (oxidising to reducing) can lead to the seafloor remobilisation of Se
- On a regional scale, increased magmatic influx demonstrates a robust link with Te and Se enrichment
Exploitation Route Implications for land contamination and mining of Te and Se.
Sectors Environment,Other