HyloggingTM services & applications
The HyloggerTM operates using a semi-automatic step and measure procedure that allows it
to process a range of sample materials from continuous core to chips and pulps. The
HyLogger™ can log on average ~700m of core per day. Chip samples can be measured in
their original trays and are scanned in groups of three, allowing approximately 2000–3000
samples to be logged per day. The instrument operates at a wavelength range of 400–2500 nm
and is suitable for detection and analysis of an extensive list of minerals, including:
- Clay minerals: kaolinite, dickite, nacrite and halloysite from the kandite group;
montmorillonite, nontronite, saponite and others from the smectite group;
palygorskite–sepiolite group minerals.
- Micas: muscovite, sericite, illite, paragonite, celadonite and other micas from the
muscovite group; biotite, phlogopite, annite and other micas from the biotite group.
- Chlorites: clinochlore, chamosite, sudoite and other minerals from the chlorite group.
- Serpentines.
- Pyrophyllite – talc group minerals such as pyrophyllite, talc and minnesotaite.
- Amphiboles actinolite, tremolite, edenite, hornblende.
- Tourmaline group minerals such as dravite and shorl
- Other metamorphic and alteration silicates like epidote group minerals, prehnite, topaz,
etc.
- Opaline silica.
- Selected zeolites, mostly Na- and Cabearing like analcime, laumontite.
- Mg- and Al-oxide and hydroxide minerals like brucite, gibbsite, and diaspore.
- Fe-oxide and -hydroxide minerals like goethite and hematite.
- Carbonates like calcite, dolomite, ankerite, siderite, magnesite.
- Sulphates, for example alunite, jarosite, gypsum.
- Some REE-bearing phosphates and carbonates like monazite and bastnaesite group
minerals.
Digital mineral indices (also known as spectral parameters) can also be extracted from the
HyLogging™ data to represent changes in relative proportions (such as the hematite:goethite
ratio or relative clay proportion) as well as changes in the chemistry of key minerals. These
indices are numerical values that can be analysed and plotted in a similar way to geochemical
data.
In addition, the HyLogging™ system also collects high resolution photographs of the core trays,
providing a detailed digital archive of colours and textures in the core samples to compare with
the spectral data. A digital munsell colour value can also be calculated directly from the visible
spectral data.
Core or chip box photos captured by the HyLogger™ system can be archived and exported to
CoreViewer™ software for easy retrieval and viewing.
Depth start and end information is stored for each photograph, allowing a search on depth for
specific boxes or samples. Most importantly, the CoreViewer™ software creates a continuous
photographic core strip allowing uninterrupted graphical comparison of depth-registered data
with the core itself.
Any type of depth-registered data may be added into CoreViewer™, including geochemistry,
mineralogy, and downhole geophysics. A secure key is required to link all data and the core
strip in each CoreViewer™ session. Clients can use their own CoreViewer™ software or ALS
can facilitate the process, the choice is yours.
The principle commodity currently utilising the HyLogger™ technology is iron ore, however, it
has applications for other mineral commodities such as uranium, gold and base metals. The
spectral data collected by the HyLogger™ can also be used to assess the clay type and
crystallinity as well as depth of oxidation, when drilling through deep weathered lateritic regolith
profiles as seen in locations such as Australia, Africa and parts of Brazil.
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