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Gold/Mining/Energy : ASHTON MINING OF CANADA (ACA) -- Ignore unavailable to you. Want to Upgrade?

To: Phoenix who wrote (2770)	11/6/1997 12:41:00 AM
From: ICE	Read Replies (2) \| Respond to of 7966

A quick clarification. 1. For the purposes of diamond exploration I would class the Buffalo Head domain as neither a mobile belt nor a true craton. It is clear that there is some good mantle roots within the domain, based on the presence of diamonds in K14. Limited age dating of the crust indicates that there has been some remobilization in the Proterozoic. This simply down grades the area from a diamond potential point of view in comparison to areas of old stable archean crust which has not been remobilized, such as the Slave Province. I feel that it is misleeding to call the entire Buffalo Head domain a craton, beacuse most people would compare it to stable Archean cratons such as the Slave, Superior or Nain cratons which represent classical targets for diamond exploration. 2. Alteration of kimberlite is very common and from what I have seen does not have any bearing on the diamond grade. Olivine is commonly altered to serpentine and the ground mass minerals can also be altered to clay minerals. This could occur when the kimberlite erupts or through weathering and groundwater penetration. It is not a product of metamorphism. Most craterfacies kimberlite that I have seen has been highly altered (the exception would be Fort a la Corne). Alteration of the groundmass minerals makes classification of crater facies rocks difficult. Regards,