Elements and Performance Criteria
- Classify ore samples and select fluxing method
- Review client request to identify sample/analysis requirements, preparation methods and equipment involved
- Inspect samples, compare with specifications, record and report any discrepancies
- Conduct visual and simple chemical tests to identify the type of sample and sulphide concentrations
- Review client sample/analysis history and identify possible chemical interferences
- Decide whether non-standard fluxing is required
- Select sample weight and flux to optimise precious metal recovery and purity
- Prepare for precious metal recovery
- Identify hazards and workplace safety procedures associated with the sample, preparation methods, reagents and equipment
- Examine the recommended preparation method to identify the critical steps that will affect the quality of analytical results
- Plan parallel work sequences to optimise the throughput of multiple sets of samples
- Assemble all required equipments, materials, reagents and check they are fit for purpose
- Recover precious metals from ore sample
- Weigh required amounts of sample and flux components to achieve an acceptable button and fluid slag
- Select the type and size of pot to suit sample method and client requirements
- Mix charge to ensure homogeneity and optimal collection of precious metal
- Set and monitor furnace temperature/time to ensure complete fusion
- Separate slag and button with minimal loss of lead collector
- Maintain sequencing in order to track samples, buttons and prills throughout the recovery process
- Separate lead collector from the required precious metal and check for contamination, losses and evidence of other precious metals
- Minimise personal exposure to hazards and the release of collectors to the work environment
- Collate laboratory documentation and the prepared sample and present for analysis
- Troubleshoot and correct failed recovery
- Monitor all stages of recovery for indicators of potential loss
- Recognise undesirable recovery conditions and decide whether the process requires correction
- Choose an appropriate corrective action and re-start the process
- Document any adjustments made to standard methods and re-sequencing of samples
- Seek advice when problems are beyond scope of responsibility or knowledge
- Perform daily maintenance of assay equipment
- Segregate and dispose of waste in accordance with workplace requirements
- Grade and inspect pots using established criteria prior to storage for re-use
- Inspect furnaces for cracks, unserviceable components and remove slag
- Inspect and clean extractive systems
- Report defective equipment and consumable requirements to appropriate personnel