Page 376 - NEWGEN21-Proceedings-Full

EXPLORATION TECHNIQUES

Successes and Challenges

▪ Surface geochemistry:
▪ Sampling and interpretation requires an understanding of geomorphology and
regolith – artisanal contamination, slope transport, outcrop, basalt boulders etc.
▪ Auger preferred to soils, but must sample saprolite to be effective.

▪ ICP and XRF multi-element geochemistry for pathfinder elements and
lithogeochemistry.

▪ Geophysics:
▪ High-resolution aeromagnetics/radiometrics survey completed in early 2020.

▪ Resolution of structural architecture – major structures and lithostructural packages.
▪ Drilling:
▪ Shallow weathering and abundant outcrop reduces effectiveness of aircore and
trenching in many areas.
▪ Carefully targeted shallow RC as an initial test of priority targets.

▪ Early diamond core for structural information.
▪ Drill spacing is important!

▪ The integration of good mapping, geochemistry, geophysics and drilling, with due
consideration given to the limitations of the various techniques, has been key to Fortuna’s
ongoing exploration success at Séguéla.