An area centred on the hamlet of Green Patch, located ~10 km north-west of Port Lincoln, was taken up to appraise the iron ore potential of known near surface BIF magnetite mineralisation occurring at the Greenpatch (sic) prospect that had been previously explored by SADM in the 1950s [see RB 58/19, RB 59/12 and RB 62/140]. At that time, sighter metallurgical testing of drill core samples obtained from that programme had returned encouraging magnetite head grades and more importantly, had yielded separated high iron, low silica magnetite mineral concentrates with very low levels of phosphorus and other deleterious elements. The host BIF was recorded on drill core logs as being a strongly banded gneissic rock, typically containing monomineralic magnetite bands alternating with siliceous, dolomitic and iron rich silicate bands. At Green Patch it appeared to have been strongly recrystallised by high grade metamorphism, and there is local upgrading and thickening of the magnetite bands in the axial regions of folds. The BIF there forms part of a basement lithostratigraphic sequence which includes dolomitic marble and calc-silicate gneiss which have undergone deep lateritic weathering. While the BIF has not become as deeply weathered as adjacent units, the depth of drilling required to reach fresh magnetite on the prospect had been shown by SADM to be between 20 and 40 m. During the first licence year, the exploration programme was designed by SAIOG to define magnetically anomalous or unusually dense shallow drilling targets and evaluate them as rapidly as possible, and so it comprised: • acquisition in August 2002 of part of a multi-licence, low level fixed-wing high resolution airborne magnetic/radiometric/DEM survey, for 522.7 line km along SE-NW flight lines 40 m apart, using a 20 m mean sensor height above the ground surface; • acquisition in November 2002 of a 900 station ground gravity survey over a 200 m x 50 m grid; • the drilling of 12 inclined RC drillholes (one, GRDD002, with a 110.95 m NQ2 diamond cored tail from 65.6 m) for a total penetration of 1454 m; • performing Davis Tube Recovery (DTR) magnetic separation and magnetic mineral concentrate assaying via XRF spectroscopy on 124 selected drill cuttings samples; and • performing whole rock iron ore suite assaying via ICP mass spectroscopy on 639 samples. The aeromagnetic survey data clearly resolved the main regional magnetic anomaly into discrete linear high amplitude anomalies closely conforming to known magnetite BIF subcrop locations. An interpretation made of these data which included results from mapping of sparse outcrop suggested that the BIF strata have been folded to form part of a complex antiform that plunges moderately towards the north, but they have been disrupted and offset along a number of NW and N trending faults. The gravity survey data outlined a coherent 2 milliGal anomaly extending over the western and central parts of the Green Patch prospect, which partly coincides with the peak magnetic anomalies. However, the main area of outcropping jaspilite and ironstone in the central part of the prospect is not associated with either a significant magnetic or gravity anomaly. The central and eastern parts of the prospect which were only weakly reflected in the gravity data were downgraded by SAIOG for containing significant iron ore. This also included the central part of the prospect with outcropping BIF but no associated magnetic anomalism. Here historic SADM diamond drillholes GD4 and GD7 had intersected only low grade martite-goethite bearing rocks in the near subsurface. Because of its obvious magnetic and gravity high features, the western part of the prospect which had been previously tested by SADM drillholes GD2 and GD3 was selected by SAIOG for further drilling. The outcome of this decision was successful, when 11 of the new RC drillholes defined two main bodies of magnetite mineralisation in the western part of the Green Patch prospect, called the Homestead and Hillside deposits. Preliminary exploration targets were subsequently calculated for each, i.e. Homestead : 27 Mt @ 29% DTR (69% Fe and 2% SiO2); Hillside : 35 Mt @ 26% DTR (69% Fe and 2.5% SiO2). The drilling showed that subcropping basement rocks, which dip moderately to steeply towards the north-west, have been intensely but irregularly folded, with more than one phase of folding evident. The rocks are variably weathered and lie beneath a thin mantle of stony soil. There is some transported alluvial cover over the Homestead deposit. The depth of weathering of BIF units is variable, being generally deeper at the Homestead deposit (tested by holes GRRC001 – GRRC003) and shallower at the Hillside deposit (tested by holes GRRC 004 – GRRC011), where the BIF forms a ridge. As at the Carrow deposit located west of Port Neill, the BIF is enclosed within a sequence of dolomitic marble and calcsilicate rich BIF units. The BIF has been variably intruded by granite (e.g. in hole GRRC004), but most of the still incompletely drilled sections drilled contain minimal granite. From visual inspection of the drill core, the Green Patch magnetite grain size appeared to be in the range 50 – 75 microns, which is finer than for the Carrow deposit. During licence Year 2, farminee SAIOG's parent Portman commissioned a regional prospectivity review that generated a report written by David C. Fielding entitled " Iron ore prospects, eastern Eyre Peninsula, South Australia" [this report is held separately in Env 9473]. After receiving and studying this report, the Portman board decided late in 2003 to abandon its iron ore search in South Australia and to to sell all of its SAIOG-held iron ore interests to Centrex Metals. During licence Year 3, Centrex Metals invited David Fielding to visit the state to examine the drill core from SAIOG drillhole GRDD002, and to sample oxidised BIF plus haematite float from an outcrop close to that drill site. Three rock samples that he chose as being representative were sent to Amdel for assaying. Another iron ore prospectivity review for the central and eastern Eyre Peninsula, with an emphasis on guiding the re-drilling and re-evaluation of the haematite deposits at Wilgerup, but also providing a logistical and technical strategy for evaluating other known iron ore occurrences including those at Green Patch, was performed by consultant iron ore exploration specialist Chris Robinson at the request of Centrex Metals, and was completed in August 2004. Efforts were made to attract another joint venture partner willing to participate in the establishment of an iron ore mining and processing business which would use existing infrastructure and port facilities to export both haematite DSO and magnetite concentrate. During licence Year 4, geophysical and geological consultants were engaged to compile and reprocess all available geophysical data for EL 2816, and to carry out computer modelling of those data for interpretation. This work was incomplete at the end of the reporting year. During licence Year 5, a second phase of in-field iron ore exploration was undertaken based on new targets that were derived by consultant Duncan Cowan from his detailed section modelling and interpretation of reprocessed magnetic data. The targets included: • areas where cross cutting structures are associated with a reduced amplitude magnetic response; • areas where cross cutting structures have no associated reduced amplitude magnetic response; • an area of reduced amplitude magnetic response associated with a northerly through-going structure; and • inferred strike extensions of known BIF strata into areas of subdued magnetic response. A drilling campaign of 22 slimline inclined RC holes for 1926 m was conducted in January-February 2006, when 87 selected downhole drill cuttings samples were submitted for multi-element assaying, and 54 samples were sent for DTR testing of recoverable magnetite. No significant haematite mineralisation was encountered. Magnetite hosted in carbonate-diopside-magnetite rock and silica-magnetite rock was encountered in previously undrilled areas and along strike from past intersections. The results proved that at the Green Patch prospect a detailed analysis of high resolution magnetic data is effective at outlining magnetite host lithologies, and that loosely inferred estimations of bulk tonnage can be based on the apparent extent of such lithologies. The perceived potential for identifying buried economic haematite mineralisation was said to remain promising, and warranted acquiring detailed gravity surveys and doing further shallow drilling. Only sparse and weak geochemical anomalism was evident in the downhole sample assay results. Centrex representatives logged, photographed and measured the magnetic susceptibility of 1065 m of stored drill core material from previous drillholes completed in the subject licence area. An exploration model for iron mineralisation was developed by Centrex Metals which would be applicable to exploration for iron ore in all of its tenements. The model's preparation included making a literature search and further research in general into the geology of South Australia and the types of mineralisation present, plus interpreting geophysical images and comparing features seen with those characterising the Middleback Range iron deposits. Geologist Chris Gaughan of Centrex Metals and geological consultant Mahendra Pal visited the Middleback Range and the Iron Duke mine. Chris Gaughan returned later to log BHP drill cores stored in PIRSA's Whyalla sample storage facility, and inspected drill cores then held onsite at Iron Duke. ************* Switch to licences' joint reporting (reports held separately - see Env 11450) for the 11-year duration of the Southern Eyre Peninsula JV Project between Centrex Metals Ltd/Lincoln Minerals Ltd and Eyre Iron Pty Ltd. ************* During the last six years of tenure of the subject licence (Years 14-20), no work was done, mainly because of a limited budget and because LML's strategic focus shifted onto preparation of a mining lease proposal for the higher priority Kookaburra Gully Graphite Project in the Koppio district south-west of Tumby Bay.