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Gold/Mining/Energy : Twin Mining (formerly Twin-Gold) -- Ignore unavailable to you. Want to Upgrade?

To: Letmebe Frank who wrote (81)	1/23/2002 3:03:52 AM
From: VAUGHN	Read Replies (2) \| Respond to of 613

Hello LMBF G10's - good, lotsa G10's better, Chromites - good, lotsa Chromites - better, Illmenites with high magnesium - good Will; didn't get into Eclogitic Garnet, Chrome Diopside, Olivines, etc. But don't worry about it. By the by, there's a slide show on TWG's web site that has a few bar graphs that make a few comparisons that may be of interest. Regards Vaughn

To: Letmebe Frank who wrote (81)	1/23/2002 7:18:23 PM
From: russet	Read Replies (2) \| Respond to of 613

Diamond indicator minerals: Some small additional thoughts to the body of work already presented,... Hundreds of thousands of indicator mineral crystals form in the same places and under the same conditions that diamonds get formed in, hundreds of miles beneath our feet. As the indicator minerals are more abundant than diamonds, we can use their presence on the ground as "indicating" that diamonds may be present too. Unfortunately indicator minerals fall into high temperature and pressure crystal lattice structure formation,...very exciting and interesting work for highly trained chemists and physicists,...but without a PhD in the subject area, it can be difficult to figure out the language and ground rules. Also indicator mineral crystallization (formation) is subject to great variability depending on pressure, temperature, element composition of the solutions they are formed from and in, history of the environments these crystals were exposed to over billions of years, etc,. The fact there are some similarities in composition of indicator minerals in different diamond containing rocks forming pipes and fissures in the same craton is somewhat amazing, let alone similarities in them from craton to craton. As our testing procedures get better, we are finding great differences in crystal structure and elemental composition of indicator minerals, and diamonds from pipe to pipe, craton to craton. In spite of this, following some simple rule of thumbs (the presence of favorable crystal structures and compositions of such minerals as pyrope garnets (especially G10 compositions), Chromites, Illmenites, Eclogitic Garnet, Chrome Diopside, Olivines, etc.,) has led to discoveries of several economic pipes, because diamonds seem only to be formed at certain temperatures, pressures and composition of melt,...and a lot of other crystals are formed under the same conditions. Under slightly different conditions the crystal structures and compositions of indicator minerals change, so studying the crystal structure and composition of the indicator minerals and looking for ones that would be formed where big diamonds could crystallize and form the most perfect diamond crystal structures makes sense. It is a relatively new science, and we will know a lot more in a decade, than we know right now. The best rule of thumb seems to be,...the best indicator mineral for big diamonds,...is big diamonds (ggggggggggggg) Of course finding the right indicator minerals is one of the techniques explorationists are using to find and narrow down the number of diamond containing volcanic rocks they perform expensive drilling on. The interest in indicator mineral crystals are not just confined to diamond mining. Many scientists are examining these crystals to better understand the properties and composition of what is underneath the floating boats of rock we live on aka the "Mantle". Indicator mineral compositions and structures from pipes that blew up in different geological time periods give us an understanding of how conditions of the mantle and the mantle crust interfaces have changed with time. It's all so exciting (gggggggggggggg)