Fieldwork
During the geological survey, boreholes are drilled using a drilling rig on a grid of no less than 100 × 100 m, with a minimum diameter of 135 mm. The closer the borehole spacing, the more accurate the information about the deposit, material quality, and distribution.
Fieldwork also includes hydrogeological work—groundwater level measurements, and for dolomite, limestone and gypsum, a more detailed survey and analysis of the relevant groundwater horizon. SIA “Geolite” also carries out a topographic survey of the deposit area.
Sampling and Laboratory Testing
Samples are taken from the recovered drill core or auger throughout the full thickness of the useful layer at 1–5 m intervals. Quality testing is performed in an accredited soil testing laboratory.
For sand & gravel and sand, two key quality parameters are determined: particle size distribution (gradation) and the water filtration coefficient. For dolomite, aggregate abrasion resistance is determined (the Los Angeles (LA) coefficient). Where required, additional material tests can also be carried out based on the Client’s requirements.
Geological Survey Report
After completion of the field and laboratory work, SIA “Geolite” prepares the geological survey report, which includes:
calculation of covering layer and extractable material volumes, and determination of quality parameters for each material type;
where required, volume calculations using 3D surface modelling;
preparation of the report in both printed and digital (PDF) formats;
submission of the resource calculations to the relevant regulatory authority for acceptance.
Resource acceptance
The deposit survey is concluded with an official resource acceptance protocol issued by the competent authority, confirming that the deposit has been surveyed in accordance with applicable legal requirements. Based on the geological survey report, the necessary documentation can then be prepared to proceed with starting extractive operations.
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