The sample preparation is the foundation of accurate and reliable analytical results. To achieve the representativeness the element of interest is liberated from the sample matrix and distributed homogeneously in the sub-sample. By proper sample preparation techniques, modern state-of-the-art equipment and skilled staff we produce representative sub-sample from the bulk material submitted to the laboratory. The selection of the sample preparation procedures depends on the type and size of the sample, the mineralogy, and the analytical and budgetary requirements of the client.
We offer core sawing service along with further sample preparation. The drill core can be cut to split to achieve a sample for analysis and storage.
All samples are sorted and dried upon arrival to ensure they are free of moisture prior to crushing and pulverizing. Drying procedure depends on the type, mass and moisture content of the samples. The drying temperature is typically controlled at 60°C to ensure complete loss of moisture. Drying temperature of < 40°C is applied to certain heat sensitive sample types and analyses (e.g. Hg, enzyme leach and other selective extractions).
The particle size of the samples is reduced by crushing in order to enable splitting or pulverizing procedures to be carried out. Samples are crushed to particle size of > 90% passing 2 mm. Quality of crushing is routinely checked as part of our quality assurance program.
Sample splitting is done in order to reduce the sample volume for pulverizing step. Splitting is performed on nominal sample particle size of < 2 mm and with riffle splitter or rotary sample divider in order to obtain representative sub-samples.
Pulverizing is required to produce a fine homogenous powder to enable representative sub-sampling for accurate analysis. All samples are reduced to >95% passing 106 µm or >95% passing 75 µm depending the subsequent analysis method. Quality of pulverizing is routinely checked as part of our quality assurance program. Pulverizing bowls are carefully cleaned after every sample by using cleaning sand, vacuum and compressed air.