BASE METALS

East Kimberley Project

The East Kimberley Project tenements are located in the Halls Creek area. Halls Creek is located 347km south of Kununurra and is readily accessible via the sealed Great Northern Highway. These tenements currently comprise three exploration licences - Koongie Park, Mt Bradley and Antrim Plateau (see figure below).

 

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Location of East Kimberley Projects

 

Previous exploration including helicopter-borne geochemical sampling has highlighted the following tenements as having potential for significant mineralisation:

- Koongie Park (E80/4221) - Volcanogenic Hosted Massive Sulphide deposit ("VHMS") base metal mineralisation (i.e. Doolgunna/Degrussa,      and Bentley/Jaguar style).

- Antrim Plateau (E80/3923) - manganese and copper mineralisation.

- Mt Bradley (E80/4220) - manganese and Rare Earth Elements (REE) mineralisation.

 

Koongie Park

Legacy Iron holds exploration licence E80/4122 that is contiguous with ground under exploration by Anglo Australian Resources Limited (AAR) at its Koongie Park VHMS base metals deposit. AAR has defined substantial base metal/gold/silver mineralisation in two deposits to date, with a total JORC resource (Indicated and Inferred) of 8Mt at 3.3% zinc, 1.2% copper, 0.3g/t gold and 23g/t silver. AAR has also recently outlined a shallow supergene high grade copper resource.

The style of mineralisation (VHMS) is similar to that found at Sandfire Resources' Doolgunna discovery and at the Teutonic Bore/Jaguar/Bentley deposits of Independence Group.  This style of deposit is known worldwide to occur in clusters and often the early discoveries in these camps are not the largest.

Recent high resolution aeromagnetic data has shown the presence in Legacy Iron's ground of substantial areas of the same stratigraphic units that host the AAR base metal mineralisation (see figure below). These lie largely under shallow alluvial plain cover.

 

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Koongie Park - high resolution aeromagnetics

(red = high magnetic stratigraphy equating to magnetite bearing members of prospective Camp Shale Member)

 

Fieldwork was aimed at validating these similar trends as much as possible in the field.  The host Camp Shale unit was found to outcrop only in the most northern sector. However, weathering resistant tourmaline rich cherts were found as sparse outcrop and sub-crop in the southern sector within open alluvial plain. These are indicative of submarine exhalative processes related to VHMS mineralisation. (see figure below)

 

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Koongie Park - outcropping tourmalinite chert horizons


At one occurrence, the Jillaroo prospect, the chert horizon contains a substantial gossan (representing weathered, leached sulphide mineralisation).  Assays were taken using a portable Niton XRF unit. These showed substantially elevated base metal concentrations to 994 ppm zinc, 173 ppm copper, and 253 ppm lead (see figures below).

 

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Jillaroo prospect - tourmalinite chert with gossan



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Jillaroo prospect - gossan



This reconnaissance work clearly indicates the excellent potential of the Legacy Iron ground to host VHMS mineralisation.

Airborne high resolution aeromagnetic data has been acquired and is being processed by geophysical consultants Core Geophysics. 

A recent HELITEM survey over the northern part of the project area produced several significant conductors, one of which is associated with the Jillaroo prospect gossan (ASX announcement - 15 March 2013). Modelling of most of these conductors has been completed. With reference to the figure below, the most significant results of this modelling are:

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 3D plan of HELITEM conductors

 

A to D:  Conductors associated with the VHMS basemetal prospective volcanosedimentary stratigraphy. This stratigraphy is masked by shallow alluvium. Conductors are moderately to steeply dipping with modelled tops being shallow (60 - 90m)

E and F:  These conductors are associated with the major Angelo Fault with the most significant conductors occurring on the fault at interpreted splay fault induced dilational zones. These conductors have been modelled with tops 175 - 205m deep.

The recent high grade copper discovery by Cazaly Resources Ltd (ASX announcement 20 June 2013) lies immediately to the south in similar stratigraphy.Drilling is planned for all the conductors. Statutory permission has been received for the drilling program and a heritage clearance survey is to be conducted shortly following a recent meeting with native title parties.