Presented by Murray Rayner.

Since the discovery of world class Argyle diamond deposit in 1979 and the commencement of mining alluvial diamonds in 1982 and the AK1 pit in 1985, the geology of the AK1 lamproite pipe has changed significantly over the years.

The mine has now ceased production since November 2020 and is currently in closure and rehabilitation.

This talk discusses the history of the Argyle AK1 deposit from discovery, alluvial diamond mining, multiple drilling programmes, the evolution of the geological model and the mining of the orebody within the pit followed by the block cave.

It will also describe the current emplacement model and internal lamproite domains displaying the iconic lamproite textures.