Выражение встречается в следующем контексте:

Rhenium content of 137 select split drill core samples from diamond drill holes RB-06-132 to 138 (2006 core drilling carried out by Torch River Resources on the Red Bird porphyry Mo-Cu deposit) returned an average geochemical analysis value of 106 ppb Re or 0.106 grams/tonne Re. The first drill hole (RB-06-132) was analyzed in detail (sample width @ 2 m. or 6.56 ft. for each of the 58 samples analyzed) for rhenium corresponding to the section which returned the best zone of molybdenite mineralization giving the following results:

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