Once the limits of the potential open pit had
been established using the outcrop line and the
stripping ratio limit down dip, it was possible
to calculate the average quality of the in situ
and the mineable lignite. The weighted average
quality data. The in
situ lignite quality includes small areas of
lignite which may be included in the lignite
resource of the basin but were considered to be
inaccessible to open pit mining. All the analyses
were reported on an as-received basis. The
air-dried moisture content was calculated for
several of the lignite samples from the final
series of holes. The results showed that the inherent
moisture (air dried) was approximately
8% and the surface moisture was approximately
7%, totalling 15% on an as-received
basis. The moisture content does not precisely
represent that of the mined lignite because
of the presence of drilling fluid in the core
samples and also the additional moisture that
would be picked up during mining.
The sulfur content of the KM2 seam was
analyzed in a few cases. The results indicate
that the KM2 is a low sulfur lignite. The
weighted average is as follows: combustible
sulfur 0.53% and sulfur in the ash 0.42%, giving
a total sulfur at 0.95%.
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