Had a dandy visit with geological survey of canada guy on the phone yesterday. Last time i was in his office, he gave me a piece of wood that is 44 million years, 10 months old. I know it is, as he said it was 44 million--carbon dated--and that was about 10 mos ago. You can carve on it, and it would burn. A wood similiar to redwood, that was almost semi-tropic when kimberlites came up. when this happens, they form a 'craton' and it collapses back on itself, usually, hence the wood was cut off from oxygen to decompose and hence most kimberlites have lotsa overburden on them. Some of the ones in montana don't. Typical canadian diamonds are worth about 100$ a carat, i think, at least from diavet. Lotsa small and defective stones. The south canaidian mine has about 300m of overburden, but samples have lots of larger stones and worth about 400$, so it's proceeding. Plus lots better location. For those of you interested in learning about canadian mines----and you might be, as they are far more advanced--here's a link:
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