If you read Tom Sanders BRB stuff you will see the use of this...

If you read Tom Sanders BRB stuff you will see the use of this word a bit - lamprophyre. He is excited about it. It exists at Lake Roe.

This is an extract from perdant's link:

Lamprophyres are a very different species from diabase/dolerite and are noted for their deficiency in silica and enrichment in sodium and potassium. They are similar to diabase/dolerite in their generally mafic (high-temperature iron rich silicate) composition, but their mineral composition includes large biotite (potassium rich mica) crystals and a family of minerals known as amphibole (or hornblende). Like kimberlites, they form at great depths and are seen as a connection to the mantle. Given their spatial association with Archaean gold mineralization, debate has focused on their role as potential mineralizer or later intrusion. Lamprophyres are generally gold deficient and while it's possible that they were the source of the gold in associated systems, the association with gold deposits is more likely to be related to large scale structural activity. Lamprophyres are an indicator of tectonic extension and they occur in the same places that hydrothermal systems are likely to occur. So the importance of Lamprophyres is that they likely indicate an extensional environment with the potential for large volumes of hydrothermal activity.

Is there lamprophyre in the Karonie tenements?