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Murninnie Mine, Eyre Peninsula, South Australia
(Copper/gold, AAO – 45%) continued
It occurs in close proximity to granite bodies of the “Hiltaba”
suite which are associated with all the above-named
deposits, and others throughout the Gawler Craton (Figure
10). The surrounding EL is also prospective for uranium,
both in the crystalline basement and younger sediments
which cover the eastern part.
Historic mining development extends to more than
50 metres depth while mineralisation is exposed over
450metres strike length in the walls of a steep gully shown
in the photo below. Ore shipments averaged around 10%
copper, and in some cases assayed up to 5% bismuth.
Recently sampled mine dump material assayed up to
7.7% copper, 3.8 grams/tonne gold, 2.4% bismuth and
10.0 grams/tonne silver. The extensions of the deposit
have never been drilled.
Mining spoil marks the
trend of the Murninnie
lode obliquely cutting
across “Hurrels Gap”
gully. View towards
the south east.
The smaller photo shows pervasive hematitic alteration of
metasediments at the mouth of one of the adits into
the mineralisation
Soil geochemistry and occasional outcropping showings of
secondary copper mineralisation indicate extensions of the
mineralised structure over several kilometres to the north
and south. An extensive gravity survey completed in 1984,
centred to the west of the Murninnie area revealed a
5 milligal anomaly at its margins covering the unexplored
south-west part of the EL (Figure 11).
Secondary copper coatings (greenish) on outcropping hematitic brecciated
granitiod host-rock – outcrop at “The Scratchings”
Although the regolith cover is shallow over most of the EL,
outcrop is limited and patchy, and calcrete development
is extensive. The geochemical and gravity data acquired
to date (Figure 11) present a number of targets for
drilling which is proposed to commence early in 2007 after
completion of further gravity surveys.