Ann: Breakthrough Results at Mt Alexander, page-46

Good to finally get an update from the company and I always love a bit of MT, even though its been around since the 40's its only been the last 4-6 years since its really taken off due to better instrumentation, improved 2D + 3D modelling software and better computational power.

Though before they start to plan the next bit of drilling, I would prefer to see some more AMT done as it's one of the cheapest!!! methods available to see past the conductive sediments which other EM methods struggle to see past.

Why? because MT in a nutshell samples the bulk average resistivity and the longer you leave the instruments out the greater depth you'll sample. And as we are dealing with diffusive fields (electric + magnetic fields), it means you'll need data to the other sides of the transects of data already collected to better constrain and improve the confidence in the model. In laymen terms, think of a single MT station as a hemisphere, where at the surface is the pole, and as you start looking deeper you'll be increasing the width of the sample area (in the simplest terms say your looking at 1km depth, then ya'll be sampling an area with a radius of ~500 m from at that depth both length and width wise [dependent on a few different factors]).



So to better constrain the models at certain depths you'll want data to both sides of the areas of interest identified in the current survey, then model it in 3D.

The MT won't tell us where the nickel is, it will tell us where conductive and resistive features are. The interp of the models will be done by the geos with the geophys. As the conductive features will either be sulphides, graphite, clays or saline water... but we can rule out a few of those from what we know about the core from previous drilling.

But the MT is a perfect method for finding that deeper source! So it would be good to see a bit more broad spaced MT done with some infill at areas of interest, especially towards the west end and see if the feeder zone is located towards the Ida fault... Though we've still got the E-W MT transect to be released as well.