Applied mineral exploration methods, hydrothermal fluids, baro-acoustic decrepitation, CO2 rich fluids
Newest Topics:
For the latest news, see the NEWEST TOPICS page.

Google is too dumb to let me put the list of news in this column and falsely claims that all my pages are self-duplicates.


Google's so-called "Artificial Intelligence" is an abuse of the concept of intelligence!

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.

morning Satr data

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.

6 level data

Samples from "7 sublevel" (thought to be from the Morning Star mine)

7 sublevel data

Samples from Campbell's reef.

campbells data

Samples from Dickenson's reef.


Samples from Till's reef.

tills 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.

various samples


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.

Back to the woodspoint page