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Gold/Mining/Energy : SOUTHERNERA (t.SUF)
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To: Donald McRobb who wrote (4419)8/31/1999 3:41:00 PM
From: E. Charters  Read Replies (2) of 7235
 
I concur with Kaminsky :)

1. Too little of the pipe was tested and too small and area was tested. I recommend, if justified, a ten thousand ton test and a wide area sample method being used with milling and recovery being done separately on each batch representing each area.

2. The testing may have been flawed in that there were probable losses by nature of an imbalanced recovery system (field reports)

3. The high average portion of 35 carats per hundred tonnes is not a bad grade. The value was low in this sample but it may not be indicative if larger stones are found.

4. Some pipes are highly zoned over wide areas and once facies are known they can be selectively milled in production.

5. The mixed type nature of the occurrences is strange. Usually bimodal pipes are low in grade though according to nickel thermometry experience. This may contrast however with the good low temperature of the geothermal gradient which correlates well with productive pipes.

I recommend a thorough nickel thermometry study from different phases of the pipe. It does not have to be done on a large sample. Perhaps 100 garnets of any kind from each phase is all this necessary. If the thermometry is good then a large sample is definitely called for. If the thermometry is inconclusive a wide area technique of smaller dimension may still be called for.

mailto:echarter@grubstake.on.ca

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