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Prediction of sonic velocities from other borehole data: An example from the Kevitsa mine site, northern Finland

Duy Thong Kieu Anton Kepic Maria Cornelia Kitzig
First published: 17 September 2018 https://doi.org/10.1111/1365-2478.12687
This research is the extended version of the work presented at Near Surface Geoscience 2016 – First Conference on Geophysics for Mineral Exploration and Mining, Barcelona, Spain.

ABSTRACT
P‐wave and S‐wave velocities are vital parameters for the processing of seismic data and may be useful for geotechnical studies used in mine planning if such data were collected more often. Seismic velocity data from boreholes increase the robustness and accuracy of the images obtained by relatively costly seismic surface reflection surveys. However, sonic logs are rarely acquired in boreholes in‐and‐near base metal and precious metal mineral deposits until a seismic survey is planned, and only a few new holes are typically logged because the many hundreds of holes previously drilled are no longer accessible. If there are any pre‐existing petrophysical log data, then the data are likely to consist of density, magnetic susceptibility, resistivity and natural gamma logs. Thus, it would be of great benefit to be able to predict the velocities from other data that is more readily available.