There seems to be some confusion about the benefits of Helitem in discovering mineralisation. This is taken from the 2nd page of an Emmerson announcement on the 11th of April this year - "New technology used in Tennant Creek mineral field".
"Whilst results of stage 1 of the HeliTEM program are pending, detailed analysis of drill core from many of
the major deposits within the ERM tenements suggest that the conductivity of the ironstones (either magnetite or hematite) which contain the mineralisation is many times above the background conductivity of the surrounding host rocks (fig 2). Furthermore, when the ironstones also contain sulphides such as chalcopyrite, conductivities are greatly magnified and in the case of the measurements from the Gecko mine, up to 80 times the background.
The HeliTEM system is not only the world’s most powerful helicopter supported time-domain electromagnetic system, but has a unique low noise receiver to ensure great depth penetration. Moreover its commercialisation on a helicopter platform has, for the first time, provided a cost effective and efficient means of screening ERM’s undercover targets with state-of-the-art detection technology.
Providing the iron-oxide and sulphide-gold bodies are of sufficient size, the HeliTEM survey has the
potential to greatly assist in more directly locating mineralisation and identifying tier 1 drill targets."
So this announcement says that Helitem can pickup mineralisation in any host rock (including ironstones)so long as the host rock is large enough.
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