from 22/11/11 ann;
Technical explanation of sampling methods
The anomalies defined from the BLEG sampling used a value of 1ppb Au, whereas the
anomalies for the auger sampling were defined using a value of 14ppb. The reason for the
different values is that the analytical methods used are quite different, because BLEG analysis
uses a weak cyanide solution as the dissolving medium within a static leach that takes place at
lower temperatures over a 24-hour period. Accordingly, the BLEG technique only dissolves a
gold which is weakly attached to clay, organic material and various iron oxides. The analysis
used for the auger samples is an aqua regia method that uses a strong mixture of hydrochloric
and nitric acids at much higher temperatures and aims to dissolve as much of the gold as
possible (i.e., a close to total digest), whereas the BLEG is only a partial digest. In terms of the
gold values, 14ppb is considered anomalous for the auger sampling, whereas the background
values will range from 1 ppb through to values of 7 to 8 ppb. Values between 8 and 14ppb may
be considered to be weakly anomalous.
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