repost on the geologist kimberlite report from rb:
Regional Triaxial Aeromagnetic Survey Assessment Work Report by N. Ralph Newson:
"Drilling results and additional ground magnetic and gravity surveys have shown the best known kimberlite bodies to be bedded, and to have a very different shape from most known kimberlite bodies. In most of the well-known diamond mines in Africa, for example, and in those in the NWT in Canada, the upper portions of the kimberlites bodies have been eroded, leaving only the feeder pipe, which has a "carrot" shape, getting smaller in diameter with depth. However, in the Fort à la Corne swarm, the tops of the kimberlitic volcanic edifices are COMPLETELY PRESERVED [emphasis added by author], and they are shaped more or less like a soup bowl, with two larger horizontal dimensions, and one smaller vertical dimension. Several of these have an inferred geological resource (based on a few holes and on geophysical modeling) in excess of 100 million tonnes, one has nearly a billion tons, and one group of five which are close together, or perhaps coalescing, contain about 2 billion tons of kimberlite. There are thus HUGE VOLUMES OF KIMBERLINE WITHIN A FEW HUNDRED METRES OF THE SURFACE." [emphasis added by author]
"The Fort à la Corne swarm of kimberlitic bodies is the LARGEST SWARM KNOWN IN THE WORLD [emphasis added by author], and some of the bodies are the LARGEST KNOWN SUCH BODIES IN THE WORLD." [emphasis added by author]
CONCLUSIONS AND RECOMMENDATIONS
1. This is a very good data set for a large area including and surrounding the Fort à la
Corne diamond area.
2. Some anomalies have been selected from the data for follow-up, and some of these
have been investigated. The remaining ones should be investigated by ground
magnetic surveys to see if they might be drill targets.
Thank you,
Robert
AI
