Applied mineral exploration methods, hydrothermal fluids, baro-acoustic decrepitation, CO2 rich fluids
Newest Topics:

New model 216 decreptiometer

Exploration of the Mt. Boppy Au deposit, NSW

Forensic tests on soil samples


Do IOCG deposits form from CO2 fluids?

How CO2 inclusions form from aqueous fluids (UPDATED)

Understanding heterogeneous fluids : why gold is not transported in CO2-only fluids

Gold-quartz deposits form from aqueous - CO2 fluids: NOT from CO2-only fluids

Discussions why H2 analysis by mass spectrometry is wrong


Gold at Okote, Ethiopia

Kalgoorlie Au data

Sangan skarn Fe deposits, Iran

Studies of 6 Pegmatite deposits

A study of the Gejiu tin mine, China

Exploration using palaeo-hydrothermal fluids

Using opaque minerals to understand ore fluids

Understanding baro-acoustic decrepitation.

An introduction to fluid inclusions and mineral exploration applications.

 Interesting Conferences:


ECROFI Iceland
     July 2-6

AOGS Singapore
    30 Jul - 4 Aug 2023

SGA Zurich Aug 2023

Comprehensive Geology Conference Calendar

Decrepitation data of gold deposits in the Southern Cross area, Western Australia

In 1994 an extensive suite of samples was collected from gold deposits near Southern Cross

Southern Cross region - location map

Samples were collected from the pink shaded mines.

Brief sample descriptions of these mine samples are here

In all cases same-numbered samples with alphabetic suffixes were collected from the same location within a few metres and show the local variability of the data.

This location map is from the Geological Society of Australia (WA division) Excursion guidebook 8 by W.K. Witt, D.I. Groves & S.E. Ho  1994. This document contains extensive geological details of the region and mines visited.

Southern cross location map

Golden Pig mine

Barren quartz at the Golden Pig mine has no low-temperature decrepitation

Golden Pig mine, Southern cross 1551

Golden Pig mine, Southern cross 1552

Gold mineralized quartz shows low intensity decrepitation at low temperature indicating a correlation between gold and CO2 rich fluids.
Golden Pig mine, Southern cross 1553

Copperhead pit, near Bullfinch

Samples from this pit were collected from the pit floor and it is not know which samples are from gold mineralized zones. Some of the samples have low-temperature decrepitation due to CO2 rich fluids but it is unknown if this feature correlates well with the gold content. Sample 1554G (black) contains non-quartz mineral contamination which causes the high decrepitation above 600 C.
Copperhead pit, Southern Cross 1554

A few samples (suffixes N, P and R) from the Copperhead pit floor do contain CO2 rich fluid inclusions and these were collected close together.  There are mappable patterns of fluid inclusion composition across the area of the pit.

Golden Pig mine, Southern cross 1554

Back to discussion of samples from the Kalgoorlie region