Investor Presentaiton
THE DATA 2
Spa*ark Energy_23
Line A
KUTh commissioned a number of MT surveys to map the 3D resistivity distribution within
~5kms of the earth's surface in the vicinity of the Lemont resource. A number of very low
resistivity (<1 ohm.m) zones were defined at depths below ~2.5km; i.e., at temperatures
above 100°C assuming the calculated geothermal gradient of 40°C/km is correct. The top
figure shows a slice of the 3D modelled resistivity distribution at a depth of 3km.
Recently, combined 3D modelling of the KUTH MT with data from the regional AusLAMP
survey has been completed, resulting in a new model with less error, higher resolution
and greater depth penetration (Ostersen, UTas PhD, 2020): middle figure.
Ostersen (2020) writes "Interpretation.... gives high credibility to the existing conceptual
model for the Lemont geothermal resource. Low resistivity structures in the new preferred
model were found to be highly spatially correlated with recently active upper crustal fault
networks, a result that was less clear in previous modelling. Minimum resistivities appear
to manifest at the intersection of Devonian granite roof topography with inferred fault
planes. Critically stressed faults at the granite contact likely result in high pore space fluid
content with thermally enhanced conductivities." Zones of <1ohm.m shown in the middle
figure (also see next slide).
Modelling of the AusLAMP-only data shows that the Lemont low resistivity zone extends
to depths below 10km (Ostersen, 2020: bottom figure); i.e., it is reasonable to infer a
major structure with rapid recharge and minimal draw down in temperature.
Top Figure: Depth slice of KUTH MT data at 3km below surface. A large zone of low resistivity
correlates with a major east-west structure within the resource outline.
Middle Figure: Combined modelling of KUTH MT data and adjacent regional AusLAMP stations
resulted in a better resolved, shallower but extending to deeper, target.
Bottom Figure: Modelling of the deeper-penetrating AusLAMP-only data indicates the low resistivity
zone within Lemont extends to a depth of more than 10km below surface.
Ohm.m
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Depth Slice: 10.06 - 11.11 km
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0000025
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Resistivity (ohm.m)
Map Projection: GDA94 UTM 255
Km
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