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Gold/Mining/Energy : Winspear Resources
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To: Andrew who wrote (11064)1/3/1999 2:39:00 PM
From: teevee  Read Replies (2) of 26850
 
Hi Andrew,
No one to my knowledge has seen the apex/feeder of a cone sheet. The possibilities are:
1. a blind pipe is present (rather than erupting to surface, a cone sheet was injected). If the grades are like the cone sheet, and it is large in diameter, it could easily be mined by block caving methods. this has been done, and at even greater depths.
2. the feeder zone/vent area pinched off or closed up again after the type II kimberlite magma was injected.
I think that we could expect a deep hole or two to look for the blind pipe, if it is there.
When I try to imagine the power required to lift a bowl shaped block of rock about 4 to 5 kilometers in diameter and about 700 meters deep at the apex, an average of 2.6 meters to inject over 100 million tonnes of highly diamondiferous kimberlite magma, it must be one hell of a feeder zone!!!If a blind pipe is there, it could be the "monster from the NWT".
regards,
teevee
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