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Gold/Mining/Energy : MARUM RESOURCES ON ALBERTA -- Ignore unavailable to you. Want to Upgrade?


To: George S. Montgomery who wrote (1781)5/3/1999 2:10:00 AM
From: russet  Read Replies (2) | Respond to of 2514
 
Evening George,

Many people assume kimberlites just blow up once to the surface to form the common pipe model. Fact is that many of the big pipes blow up several times in the same place to form pipes with many different compostional partitions. Some partitions have lots of diamonds, some have few.

Studies of pipes in Australia have shown that many of them didn't just blow up occasionally, but also spewed material for many thousands of years off and on,... which could conceivably form layered deposits or stacked kimberlites over time.. The question is,...do they produce many diamonds,...maybe,..Argyle is thought to be one of these by some people, but Argyle is a very complex mine.

To bring up diamonds, they must blow up through the diamond stablility field (several miles beneath our feet) where the diamonds were formed,....and bring the diamonds up far enough so the kimberlite, or material transporting the diamonds can cool below the burn temperature of diamonds before destroying them. In order for a layered or stacked kimberlite to do that it would have to move through the diamond stability field, "harvesting" previously unharvested areas of this field. I don't think that would happen but I ain't going argue with mother nature. The first blow would bring the diamonds up. Further blows in the same place would go through the same area presumably, but most of the diamonds would already be harvested. Once an area is harvested, they don't likely grow back, at least not for a long time. Diamonds were formed 100's of millions of years ago so the theory goes. Later on the kimberlite (or other volcanic eruptions) blows through the diamond growing area and carries the diamonds up to the surface where we can harvest them.

Don't know if this helps, but I am fed up doing tax, and dreaming of small exploration companies becoming big mining companies is more fun.

russett