Geophysical consulting for mineral exploration
End-to-end geophysical consulting for mineral exploration and resource projects, from survey design and acquisition oversight through processing, modelling, interpretation and drill targeting.
About Gauge
Gauge is Lachlan Hennessy's independent practice, a PhD geophysicist and Member of the Australian Institute of Geoscientists.
Director & Principal Consultant
I bring 15 years of mineral exploration experience and a PhD in Physics to Gauge Geophysics.
Much of my experience comes from advancing greenfields projects from discovery through resource definition. Early in my career at Newexco, I led geophysical planning, project management, modelling, interpretation, targeting and reconnaissance for Mallee Bull and Nova-Bollinger, supporting both projects from discovery to maiden resource and beyond.
I have also held technical and project roles with major mining companies. At Anglo American, I managed field geophysics for multimillion-dollar exploration programmes and developed generative exploration assessments, data-science workflows and machine-learning tools. At Teck, I integrated basin-scale seismic and magnetotelluric modelling, inversion and interpretation to resolve basin architecture and target prospective stratigraphy, with subsequent drilling confirming the target stratigraphy at the predicted depth.
At South32, I brought these disciplines together by spearheading an in-house geoscience intelligence platform that combined knowledge graphs and language models. I also conducted integrated geoscience due diligence for joint-venture and acquisition opportunities, including the Winu copper project.
This experience now underpins my work at Gauge Geophysics, where I combine geophysics, mineral-systems thinking and computational methods to solve exploration problems and support technical and investment decisions.
Senior and principal geophysical roles spanning seismic, magnetotelluric, airborne and ground EM, gravity and magnetic programs across copper, IOCG, gold and base-metal exploration in Australia.
PhD in Physics (RMIT University) and Member of the Australian Institute of Geoscientists (MAIG). Long-standing peer reviewer for the Exploration Geophysics journal and recipient of the Shanti Rajagopalan Memorial Award for best paper.
Gauge is not tied to a particular inversion package, contractor or software platform. The judgement is built on direct field, processing and interpretation experience, not a fixed toolkit.
Clear advice, grounded in evidence
End-to-end geophysical consulting for mineral exploration and resource projects, from survey design and acquisition oversight through processing, modelling, interpretation and drill targeting.
project review, survey design, contractor selection, acquisition oversight
data validation, processing, imaging and quality control
2D/3D modelling, inversion and integrated interpretation
target generation, ranking and drill targeting
3D integration of cross-disciplinary geological, geochemical, geophysical and drilling datasets
tailored solutions to geoscience challenges; evaluation, validation and integration of new technologies and AI products to reduce technical risk.
From measurement to decision
Interpretation draws on experience, judgement and geological context to extract meaningful signal, test competing explanations and reduce uncertainty around the exploration decision.
Clarify the decision, examine the available evidence and identify the work that will materially improve understanding.
Review data quality, processing and inversions, then interpret the geophysical response in its geological context.
Present the findings, uncertainty, priorities and recommended next work in a form the exploration team can act on.
