Download our Experienced Team paper.
Adrok are perfecting its capabilities to find subsurface sulphides. Like magnetic susceptibility, conductivity and density, relative DIELECTRIC PERMITTIVITY (Ɛᵣ) is a characteristic of rocks and minerals that can be used to discriminate between them using the right geophysical instrumentation. This unique rock and mineral property (i.e. Ɛᵣ) forms the founding physical principals behind Adrok's deep penetrating pulsed radar equipment and how the technology can help target different materials beneath the surface. Other measurements that are great for sulphides are:
(1) Reflected energy
Works well for massive sulfides including deposit styles: Orogenic narrow vein massive sulfide and gold -NI-PGE/layered mafic hosted -Some VHMS/VMS
(2) Changes in Energy and Frequency
Harmonic results over greater thicknesses (~>10m): Disseminated sulfides including deposit styles: Porphyry, -SEDEX, some VHMS/VMS, MVT
Groundwater and Deep Aquifer
Adrok is developing precision targeting for Aquifers up to and over 1000m depth, depending on overlying geology.
The ADR tool is a direct targeting tool whereby the Dielectric Permittivity (DC) of rocks within a vertical sequence is measured. Water has a DC of 80, whereas rocks have a DC of 5 to 30. ADR can be used to differentiate water-rich aquifers by exploiting this difference in Dielectric Permittivity.
Download Water case study infographic.
Geothermal and temperature mapping
We have developed a proxy temperature measurement using our ADR radiowaves. When a pulse is transmitted into the ground it is reflected, at least in part, by boundaries between materials with contrasting dielectrics. Water has a very high dielectric permittivity (Er = 80) whereas host rocks including sediments, granites, metamorphic rocks all have permittivity values of <15. This natural difference makes water an ideal target for the pulsed radiowaves. A key to measuring relative temperature changes with depth is that a materials dielectric properties typically change with changing temperature. Accordingly, this characteristic can be utilized to help measure temperature changes with depth.
Multiple methods are now used by Adrok to measure relative temperatures at depth beneath the surface. One method is derived from the Stefan-Boltzmans’s Law as described below:
A recent project in Cornwall, UK, demonstrated that heat can also be detected using the pulsed radiowaves' energy readings.. Here, we measure the variations within the energy returns of the ADR signal.
Intense troughs of Energy (E) Gamma below a baseline of 0.9990 correlate with known levels of temperature anomalies in the subsurface.
Shallow sub-seabed mapping system
The Adrok Subsea scanner is deployed from an ROV and is controlled remotely from the survey vessel. This allows the survey team to perform data acquisition and obtain other ROV and survey data.
Once all data has been collected it is transferred to and processed at Adrok’s headquarters in Edinburgh, Scotland. The data is processed using our own patented software and our findings are presented in detailed reports. Finally, our data is provided to our clients for integration into their datasets.