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South West WA Branch & Geoscience Society

Digital Tech Talk - New Discoveries in the Structural Geology, Mineralization and Exploration Targeting of North America

PD Hours
Bob Watchorn has explored North America to the core-mantle-boundary at 2,900 km depth using his unique EagleEye ultra-enhancement of Landsat, Gravity, Seismic tomography plans and sections. 

About this event

Over the last eight years Bob has been building a structural-geology framework for the Earth. New concepts have arisen from this research in Australia, China, Antarctica, Finland, Africa, South America and now North America.

This presentation will explain exciting new -


  • Brittle structures and rings extend to core with sinistral movement in all continents
  • No evidence of a worldwide Mobile Mantle
  • Evidence that Atlantic seafloor spreading is relatively narrow and 50°E dipping
  • Evidence of a 4 billion year old ‘immoveable lithospheric barrier from Alaska to Terra de Fuego
  • Diamond and metal mine structural geology and targeting can be visualised world-wide
  • Late Heavy Bombardment ring structures (to 8000 km diameter) extend from surface to outer core and are particularly prominent in top 600 km.

New paradigms:

  • Earth started cooler and gradually heated up with all original constituents at -100 °C
  • The earth started rigid and only started breaking up perhaps in the Proterozoic
  • True Plate tectonics only commenced relatively recently
  • No lava lamp plumes – generally lithosphere is insitu replaced
  • Planar and ring structures down to Core correlate with surface mines
  • Ascending mineralising fluids from Core supply, scavenge and deposit minerals along their path


18:00 - Live Webinar to Begin – followed by Live Q&A Session

19:30 - Webinar Close


Register for the Online event.


Register for the Face-to-Face event.



Summary image of seismic tomographic plans and sections of Africa, North America and Europe showing structural geology from surface to core.

Global Seismic Tomographic Plan.png



Bob Watchorn

Bob Watchorn was born in Tasmania. He commenced as a geological assistant with Aberfoyle Tin at Rossarden in 1968. He gained an Associateship in Mining Geology at WASM, Kalgoorlie in 1972 and BSc in 1978 at Curtin University. He commenced work with WMC in 1971 in the nickel mines in Kambalda.
After working in the Kalgoorlie and Norseman gold mines he moved to Stawell playing an important role in restarting the mine. At Stawell he completed an MSc at University of Melbourne on the ‘Structural geology and mineralisation of Stawell goldfield’ under the mentorship of Professor Chris Wilson.
He was chief geologist of the large and geologically complex Mt Magnet and St Ives gold operations. After leaving WMC in 1999 he worked as a geological consultant on many Australian and overseas projects. He commenced structural research under excellent mentors Tim O’Driscoll and Pat McGeehan in the 1980s by experimenting with geophysical software to obtain the best detail out of images used in exploration.
This, combined with his extensive 3D structural knowledge, gained from 45 years underground and surface mapping, led to the point where exceptionable (real) detail could be obtained (for the first time) from many images. This forms the basis of his current research.

Date and Time

Thursday, 29 July 2021
6.00pm – 7.30pm (UTC+08:00)


AusIMM Members $0.00
Non Members $30.00
Register now

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