To: WillP who wrote (432 ) 12/22/2002 6:25:46 PM From: E. Charters Read Replies (1) | Respond to of 16206 The best indicator mineral is diamonds (where the grade is over 0.10 cts per ton) No, the best indicator is still garnet, either calcium/chrome in pyrope by microprobe or nickel in any garnet by proton probe. The reason is that garnets vary less than diamonds in distribution, and are far more plentiful. They also, by the chemistry, lead to an estimate of probable carat grade, and thus are a useful economic bellwhether, whereas a diamond itself does not have this telltale indication of carat grade. There can be some argument here, but the diamond is still for the most part "mute" of its number of fellows, whereas the garnet is telling you how many gems live at the hotel. Admittedly the diamonds tells you quality, in some cases, and this can clue you in a bit but between, 100 CTS per ton and 0.10 cts/tonne, you are still wondering. With a garnet population the wonderment is starting to decrease with confidence. To get your garnets, the sample size need be a fraction of the sample size necessary for diamond. Refusal to look at garnet chemistry by unknowing companies has ruined pipe sampling and diamond field exploration. It is a criminal waste in Wawa and Kirkland Lake, and underscores the need for senior judgement in the business where it has been lacking. In the end I heartily disagree. I must, and there is no politically correct way to do this so that it lets one down easily. Diamonds by themselves are a poor indicator of raw grade. The trouble with all indicators is that a phase of the pipe that is low grade, will also have low grade indicators. There is a need to be pervasive in sampling. The wide sampling needed makes sample sizes small, and thus increases the need for "leads" as a guide to further bulk type sampling. These leads are a combination of methods including all atomic analysis methods of a variety of minerals including diamond, if present. EC<:-}