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The structural controls of gold mineralisation
within the Bardoc Tectonic Zone, Eastern Goldfields
Province, Western Australia: implications for gold
endowment in shear systems
Abstract The Bardoc Tectonic Zone (BTZ) of the late
Archaean Eastern Goldfields Province, Yilgarn Craton,
Western Australia, is physically linked along strike to the
Boulder-Lefroy Shear Zone (BLSZ), one of the richest
orogenic gold shear systems in the world. However, gold
production in the BTZ has only been one order of
magnitude smaller than that of the BLSZ (～100 t Au vs
>1,500 t Au). The reasons for this difference can be found
in the relative timing, distribution and style(s) of deforma-
tionthatcontrolledgolddepositioninthetwoshear
systems. Deformation within the BTZ was relatively simple
and is associated with tight to iso-clinal folding and reverse
Editorial handling: G. Beaudoin
A. A. Morey
predictive mineral discovery*Cooperative Research Centre,
Australian Crustal Research Centre, School of Geosciences,
Monash University,
PO Box 28E, Melbourne, VIC 3800, Australia
R. F. Weinberg
Australian Crustal Research Centre, School of Geosciences,
Monash University,
PO Box 28E, Melbourne, VIC 3800, Australia
F. P. Bierlein
Tectonics Special Research Centre,
School of Earth and Geographical Sciences,
University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
F. P. Bierlein(*)
Centre for Exploration Targeting (M006),
School of Earth and Geographical Sciences,
University of Western Australia,
35 Stirling Highway,
Crawley, WA 6009, Australia
e-mail: fbierlein@tsrc.uwa.edu.auto transpressive shear zones over a <12-km-wide area of
high straining, where lithological contacts have been
rotated towards the plane of maximum shortening. These
structures control gold mineralisation and also correspond
to the second major shortening phase of the province (D2).
In contrast, shearing within the BLSZ is concentrated to