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Woods Point - complete decrepitation data
The results of the decrepitation data for all of the 34 samples in this
project are shown here. All of the decrepitation curves has been
smoothed using a weighted rolling mean over 3 samples with weights of
25%, 50%, 25%. When analysed, samples are given an analytical
sequence number which ranges from H2284 to H2328 for these samples. An index of the analytical numbers and sample numbers, including descriptions, is here.
In these graphs, the samples have been grouped according to their
physical location. Exact GPS coordinates of each sample are not
available.
Morning Star adit samples. The Morning Star mine is still
operational and is the main Au producer in the Woods Point region.
Samples from "6 level" (thought to be from the Morning Star
mine). The only visible characteristics of the quartz samples was if it
was massive or laminated. Although not all of the samples here showed
the low temperature CO2 decrepitation peak, there was no
correlation between this peak and the visible characteristics of the
quartz. Sample 527 is of laminated quartz, but sample 530 is of massive
quartz and neither had a low temperature peak. Also, some of the
samples which did have a low temperature peak were of massive quartz,
while others were of laminated quartz. The visible characteristics of
the quartz are not a consistent indication of the fluid types from
which the quartz formed and are unlikely to be a useful indicator of
mineralisation potential.
Samples from "7 sublevel" (thought to be from the Morning Star mine)
Samples from Campbell's reef.
Samples from Dickenson's reef.
Samples from Till's reef.
Samples from White's reef, Burn's reef, an unknown location and barren
quartz used for cleaning the sample preparation machinery. Note that
the cleaning quartz, h2323 (magenta), is visibly distinct from the
other samples. This is expected as it probably does not come from this
locality.
Summary:
Most samples show a prominent peak near 250 C, which is caused by the high CO2
content of the fluid inclusions in the quartz. As all except one sample
(the cleaning quartz) were from Au workings we can deduce that the
mineralising fluids were CO2 rich. But without unmineralised samples we cannot say if this CO2 signature is a unique indicator of Au mineralisation potential in this area.
The occasional sample lacking a low temperature peak is to be expected.
Hydrothermal systems are extremely variable over time and the quartz
reflects this variability of fluid composition as the system
intensifies and weakens and fluctuates over time. It is best to collect
multiple samples at some or all sites to understand and allow for this
inhomogeneity.
Applied Mineral Exploration
Discussion and research relevant to mineral
exploration. 
