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The importance of sample preparation cannot be overstated and the quality of preparation provides the foundation for accurate and reliable results. MinAnalytical’s approach to preparation ensures that all samples are processed with meticulous care to ensure fine grinding and homogeneity whilst maintaining the integrity of the sample.
Sample preparation selections are important and are dependent on sample type, size, mineralogy and analysis requirements.
Dedicated high and low level sample preparation areas have been established to separate greenfields exploration from advanced resource development samples. Vacuum and compressed air cleaning protocols have been incorporated to manage any cross contamination issues with optional barren washing between samples also available and recommended for highly mineralised samples.
Notification of highly mineralised or hazardous samples is required to reduce contamination and ensure safe and correct handling.
To ensure the correct preparation protocols are selected we suggest contacting MinAnalytical to discuss your requirements.
Standard preparation packages are available to suit most sample types.
All samples are sorted and dried upon arrival to ensure they are free of moisture prior to pulverising. Low temperature drying is available for volatile speciation analysis. Samples packaged in plastic bags will incur extra sorting and drying charges.
Samples that are too coarse to fit directly into a pulverising vessel will require coarse crushing to nominal 10mm. Samples that require sub splitting prior to grinding will be crushed to nominal 2mm.
Samples >3kg will require sub splitting to a size that can be effectively pulverised in our mills. Representative sample volume reduction can be achieved by either riffle splitting for free flowing material or rotary splitting for pre-crushed (2mm) product.
All samples are pulverised utilising 300g, 1000g, 2000g and 3000g grinding vessels determined by the size of the sample. Dry crushed or fine samples are pulverised to produce a homogenous representative sub-sample for analysis. A grind quality target of 85% passing 75µm has been established and is relative to sample size, type and hardness. However the nature (hardness) of some samples is such that this may not always be achievable using standard preparation protocols.
In this case we recommend an additional 2nd stage grinding where a sub split is taken and further ground to ensure the assay pulp passes QC. In extreme cases 85% passing 75 micron may not be achievable and thus cannot be guaranteed for all samples.
MinAnalytical utilises low chrome steel bowls for pulverising which could impart trace levels of contaminates such as Cr,Fe and Mo.
Hazardous samples require specialised handling procedures and additional charges are incurred. Samples containing Fibrous/Asbestiform or Naturally Occurring Radioactive Material will be set aside for separate preparation and analysis under controlled conditions. Please ensure that the laboratory has been notified and the hazard is clearly identified on your sample submission and sample packaging. MinAnalytical consider the safety of their staff paramount and your assistance with clearly identifying hazardous samples or possible risks is greatly appreciated.
Various sieving options can be accommodated including size distribution reporting and sample preparation grind quality checks for a variety of fractions and screen sizes. Please contact the laboratory to discuss your requirements.
A range of core cutting options are available. Please consult with the laboratory regarding your requirements.
On completion of analysis all solid samples will be stored for 60 days without charge. Thereafter daily storage fees will apply until written advice has been received to return or discard at cost.
All samples submitted as solutions will be disposed immediately upon completion of the analysis.
Please note any associated costs incurred for freight, customs or quarantine inspection fees will be passed on at cost.