During licence Year 11, on renewed EL 3111 (to 27/7/2004), Perilya's exploration was focussed on expanding the mineralised intersections found near Reliance in the previous year, and on investigating the open-at-depth mineralised palaeo-karstic replacement ore-forming systems that they were now thought to be a part of. In March 2004, 10 RC holes (BTC184 - 199) for 1336 m were drilled, followed in May by the drilling of 5 RC pre-collared diamond cored holes (BTD188 - 198) for 1345.1 m. The deeper diamond holes were seeking possible hypogene zinc mineralisation along strike and below the interpreted palaeo-karstic systems. Several of the RC holes were abandoned due to encountering difficult drilling conditions, and some others were completed with a diamond cored tail. The drilling failed to intersect any extensions to the previously identified high-grade zinc mineralisation, but was able to show that the Reliance prospect’s karstic system extends for at least 450 m below the surface and has complex relationships to fault and alteration features. Surface sampling and geophysical data gathering work on the tenement for the reporting period was undertaken by the geoscience students from the Onkaparinga TAFE, as part of a training program targeting karstic cavity features 1.5 km WSW of Reliance. Student undertook auger drilling of 20 holes for 34.5 m, soil geochemical sampling (241), a ground magnetic survey with 241 readings along 11 lines at 80 m x 40 m spacing, and a ground gravity survey. The ground gravity data however was not provided to PIRSA at the time of reporting as Perilya considered it not fit for purpose. The soil sample assay data from sites close to Cambrian outcrop were anomalous, with peak values of 493 ppm Zn and 133 ppm Pb, but failed to outline any geochemical response over the karstic cavity feature they were targeting. The peak assay result from the auger bedrock sampling program was 1000 ppm Zn and 480 ppm Pb from a sandstone, interpreted to be a Jurassic unit, which had infilled a karstic collapse depression. The ground magnetic survey data obtained over the same area showed a NE-SW linear magnetic low with a high in the centre. It was believed that the low was related to the sandstone, but the high remains unexplained. The results from the students’ work served to downgrade the prospectivity of this karstic feature. During licence Year 12, exploration continued to address inferred hypogene mineralisation along strike and below the interpreted base of the palaeo-karstic system. 3 RC pre-collared diamond cored holes (BTD100, 103, 200) for 990.7 m were drilled, but no significant mineralisation was encountered. It was concluded that all three holes had failed to adequately test the down-dip extension of the Reliance mineralisation, since they had failed to reach the hanging wall of the Aroona Fault. During licence Year 13, RC drilling was undertaken to further test the depth extent of mineralisation at the Reliance deposit. 21 RC holes (BTC224 - 244) for 1241 m were drilled, however, at the time of reporting only 60% of the downhole sample assay results had been received by Perilya. The RC drilling attempted at this time was much hampered by ground conditions, with rods regularly becoming stuck downhole, so effective testing of the deeper target could not be accomplished. During licence Year 14, exploration efforts remained focussed on the Reliance deposit, where separate NW and SE mineralisation occurrences located on either side of the sandstone filled karst depression had been previously identified. Drilling of 11 diamond cored holes (BTD274-284) for 1238.6 m sought to add to the existing resource. Some of the best mineralised intercepts made were in hole BTD281, from 58-94 m, with 36 m @ 31.8% Zn and 2% Pb, and in hole BTD283 from 44.1-53 m, with 8.9 m @ 18.6% Zn and 0.5% Pb. Results from performing XRD scans of drill core samples of the main ore body showed that the top of the deposit is composed predominantly of smithsonite, and this carbonate mineral transitions into the less weathered willemite silicate form in the bottom half of the deposit. A Niton portable X-ray fluorescence (pXRF) spectrochemical scanning survey was conducted over the Emu prospect, with 571 readings taken on a 10 m x 10 m grid. Results were on par with those of previous soil geochemical sampling, with two anomalous (>0.4% Zn) areas identified on either side of a surface karstic collapse depression, exactly like at the Reliance deposit. Mineralisation found in outcrop at surface was scanned using a pXRF instrument, returning a highest reading of 13.6% Zn plus 5 other readings of over 5% Zn. During licence Year 15, exploration addressed two objectives: to do resource delineation drilling at Reliance and several other mineralised prospects, and to continue with exploratory drilling at Emu and other potentially mineralised targets. Therefore, a total of 244 holes were drilled for 12,542.175 m, comprising 76 diamond cored holes for 8733.175 m (BTD244, 285, 414, 451 - 526), including 52 diamond holes for 4705.6 m drilled at Reliance, plus 168 RC holes (BTC300 - 477) for 3809 m put in elsewhere. In April 2008, an updated Indicated and Inferred Mineral Resource estimate was generated for Reliance, of a total of 308,000 t @ 27.9% Zn using a 10% Zn cut-off grade, for 86,000 t of contained zinc. More than 90% of this resource was assigned to the indicated category, based on a combined structural and stratigraphically controlled model for the orebody. An RC drilling program of 23 holes for 747 m was completed south of the Aroona mine (at Aroona I deposit) targeting an inferred extension towards the south-east of the high-grade ore zone mined by previous explorers Pasminco Ltd, however, results showed that the orebody was discontinuous, and fault bounded. Drilling results obtained at the Aroona II deposit were more promising, with best results including 12 m @ 32.3% Zn from surface in hole BTC322, and 8 m @ 38.8% Zn from surface in hole BTC329. Further surface spectrochemical scanning traverses utilising the Niton pXRF instrument were undertaken across several prospects in the tenement (10,686 readings). During licence Year 16, the first of renewed EL 4211, work was performed at the Moolooloo (south-east of Reliance) resource as well as at Reliance, and some work was done on other geological and geochemical targets. A comprehensive review of licence area prospectivity was completed mid-2009, concentrating on identifying areas where existing resources could be added to, and on identifying areas previously under-explored but offering a high potential for near surface mineralisation to be found, such as the Moolooloo area. Niton pXRF soil scans were performed over this high priority area, with 786 readings taken to provide a baseline geochemical dataset: strong Zn anomalism was recorded north of the Moolooloo deposit (Perilya 100% owned – RL 6). A diamond drilling program was started in October 2009, with 5 cored holes (BTD527, 528, 534, 535 and 538) for 755 m completed during the reporting period. Two holes were cored at Reliance for 350 m, targeting an IP chargeability anomaly identified from historical survey data. The first hole did not intersect any significant mineralisation, and the IP anomaly was attributed to chargeability effects produced by a large karst structure. The second hole was drilled to assess the down-plunge extent of mineralisation, but it had to be abandoned when a large void was struck and the drill rods became jammed and broke off. The last section of drill core retrieved intact from this hole (BTD528) over the interval 193-215.25 m returned core sample assay values of between 2.1% and 8.9% Zn, which led Perilya to deduce that zinc mineralisation probably did continue below the then current depth of drilling. The remaining 3 diamond cored holes were drilled at Moolooloo in response to a strong zinc anomaly detected by soil pXRF scans. Drillholes BTD534 and 545 intersected a massive coronadite-hedyphane mineralised horizon over 4 m intervals in both holes, carrying 16.1-16.5% Pb with no significant Zn: Perilya thought that the higher grades of Zn (2%) evident along the margins of the coronadite were suggestive that the lead mineralisation was a late-stage occurrence that had replaced earlier zinc mineralisation. The third hole, BTD538, drilled through entirely haematised dolomite before entering Parachilna Formation sandstone, but did not intersect the targeted coronadite horizon. Weak to moderate grade zinc mineralisation (>1% Zn) was seen in 60% of the drill core, with 19% of core samples yielding assays of between 2% and 5% Zn. Perilya believed that the high background level of zinc mineralisation is associated with the haematite alteration, and thus implied proximity to a hydrothermal mineralising system. During licence Year 17, 4682 Niton pXRF scan readings of soil and outcrop were made regionally along traverses 50 m to 100 m apart, with scans taken at 25 m intervals. The scans made at North Moolooloo failed to identify any soil zinc anomalism, despite promising rock chip sample results obtained in previous outcrop mapping. The pXRF scans made immediately south of the Aristotle prospect returned strong zinc anomalism trending north-south, with readings which ranged up 17,296 ppm Zn. pXRF scans conducted 400 m south-east of the Beltana pit showed a clear increase in zinc associated with both structural and stratigraphic controls recognised in the target area, with anomalous values ranging between 2000 ppm and 4000 ppm Zn, and reaching a maximum of 7147 ppm Zn. Extensive scans were made over the Mount Bayley copper prospect (located ~5 km south of the Beltana mine) where a strong magnetic anomaly had been identified earlier in the year by airborne magnetic surveying performed (see particulars below) in the vicinity of the old Mount Bayley mine workings. Two areas of copper enrichment were identified; immediately north-west of the workings, and in an area coinciding with a magnetic anomaly; however, magnetic anomalies in the east of the Mount Bayley area did not have a similar response. Reconnaissance geological mapping and rock chip geochemical sampling (155) were also undertaken around the historic workings. In March 2010, a 2557 line km helicopter-borne magnetic/radiometric survey was flown over the tenement in 3 separate blocks, using a flight line spacing of 50 m over the Beltana block and 100 m over the other blocks. The main aim of the survey was to more clearly define stratigraphic units and structural traps that could host mineralisation. This aim was met, and the radiometric data collected concurrently also showed promise for differentiating outcropping Proterozoic from Cambrian rocks. Drilling was undertaken on Moolooloo and on the Aristotle prospect, with 24 diamond cored holes (BTD541 - 562, 564, 569 - 577, 589, 596 and 597) drilled for 3552 m and 20 RC holes (BTC618, 622, 624 - 629, 641 - 648, 651, 655 - 657) drilled for 2029 m. The drill cores and cuttings were scanned with a pXRF instrument to guide sample selection for laboratory assaying. For appraising the part of Aristotle lying outside of RL 5 on EL 4211, 3 diamond holes were drilled, but no significant mineralisation was found. Drilling done at North Moolooloo was intended to follow up the significant lead mineralisation encountered there previously. The diamond holes drilled first, to the south of RL 6, returned several intersections of moderate to high-grade zinc mineralisation. Drilling then shifted northwards to provide a “first-pass” over the mineralised zone. Here hole BTD557 encountered 12.1% Zn over 16 m from 47 m, including an intercept of 42.1% Zn over 3.75 m from 58.45 m. Hole BTD562, which was drilled down-dip of this intersection, returned 12.8% Zn over 4.05 m from 130.0 m downhole, including 30.1% Zn over 1 m from 131 m. Several lead rich intercepts were also returned from lower portions of the latter hole. Representative samples from the mineralised core were sent for petrographic examinations and description. Infill RC drilling was undertaken on North Moolooloo to further evaluate the mineralisation and to provide significant hole coverage for enabling a potential resource to be calculated. Initially, drilling done around the area covered by RL 6 and nearby was disappointing, with only low-grade mineralisation intersected within the target strata. However, when the infill RC drilling was moved to locations north of the earlier diamond hole intercepts described above, significant mineralisation was encountered. Hole BTC626 returned 28.2% Zn over 5 m from 36 m, including 44% Zn from the interval 36-39 m. This was followed by another excellent intercept made in hole BTC627, 25 m down-dip, which returned 40% Zn over 34 m from 61-95 m. Further infill drilling on a 25 m hole spacing intersected additional high-grade mineralisation including, in BTC642, 34.5% Zn over 20 m from 89-109 m. During licence Year 18, exploration was again mainly conducted on the North Moolooloo deposit, and to a lesser degree on the Mount Bayley, Emu and Beltana prospects. Limited pXRF soil scans (1689 readings made at 25 m intervals along traverses 100 m apart) were made on and around the Emu prospect to refine the selection of drilling sites. A strong multi-element anomaly was identified between Reliance East and Emu East. A first partial relinquishment for EL 4211 of 35 square km, representing an 6.8% reduction in size of the pre-existing tenure area, was made with effect from 23/11/2010. The dropped ground portion was located in the south of the licence, east of Red Range. [See the relevant summary report held separately in Env 12359]. At North Moolooloo, 29 diamond cored holes for 5373 m (BTD666, 672, 676, 678, 682 - 684, 686, 688, 690, 692, 694, 696, 698, 700, 702, 704, 706 - 708, 707a, 709 - 712, 735 - 738), plus 14 RC holes for 1776 m (BTC661 - 663, 668 - 671, 673 - 677, 679 and 680) were drilled in infill positions to sufficiently define the deposit for creating a geological model. Geotechnical drilling of 4 diamond cored holes was also performed to provide information for pit optimisation studies. Based on this work, a maiden JORC compliant Indicated Mineral Resource figure, of 214,000 t @ 34.4% Zn and 1.4% Pb, was estimated and released to the ASX in June 2011. Diamond drilling of 10 holes for 1858.3 m at Mount Bayley (BTD726 - 734 and 732a) encountered bands of low-grade copper mineralisation (up to 1.3% Cu) in the form of minor chalcopyrite associated with quartz-carbonate veins. At Beltana and Emu, no significant results were returned by brownfields RC and diamond drilling of surface zinc anomalies. An alteration study, utilising samples from existing drillholes, was carried out at North Moolooloo, with samples re-analysed for a full suite of trace element and major oxides. Perilya modelled the assay results and concluded that the following anomalous elements are characteristic of this deposit’s mineralisation halo: those that are evident on the occurrence scale (i.e. being enriched in wall rocks within the immediate deposit area) - Bi, F, Ga, Ge, Sn, Sr, W; those evident on the proximal scale (showing enrichment within 100-200 m of the deposit) - Ba, Be, Co, Cr, In; and those evident on a distal scale (showing enrichment within 300-400 m of the deposit) - As, Cd, Cu, Mn, Mo, Pb, Sb, Se, V, Zn. During licence Year 19, in November 2011, 1 inclined diamond hole (BTD748) was drilled on Emu South for 150 m, targeting a strong multi-element pXRF soil anomaly identified in the previous year. But no significant readings were obtained from 7 pXRF scans made on the drill core, and therefore no samples were taken for assay. As follow up to the North Moolooloo alteration study recently completed, retained rock materials from historic drillholes located across the Beltana area were resampled for full suite trace element assaying. Based on the assay results, a drilling campaign was begun to test bedrock near the anomalous holes. In late 2011, Perilya acquired ASTER multispectral ground reflectance satellite imagery for the entire Flinders Project area. Its aim was to use the data to recognise areas of iron enrichment that potentially could reflect characteristic haematisation of the host rocks surrounding zinc silicate mineralisation. It was also hoped that spectral carbonate and silica indexes could be used to provide a more detailed geological picture of the area on a regional scale, and possibly identify areas of unmapped carbonate stratigraphy. Utilising ferric iron and quartz ratios, inspection of the ASTER data suggested that regional haematite alteration is associated with carbonate strata along a north-west trending belt in the north-western corner of the tenement area. A scoping study of the North Moolooloo deposit was started mid-2013, to optimise potential mining scenarios and determine economic viability, and it remained ongoing. During licence Year 20, geochemical exploration via pXRF soil (240) scanning and rock chip (37) sampling for major and minor trace element analysis was performed over several grass-roots prospects including NW Aroona, Aroona Gate, South Moolooloo and AST-06. Strong zinc anomalism was detected in soil scans done at Aroona Gate, while anomalous path-finder element geochemistry was found in rock chip samples taken from the South Moolooloo prospect (the latter had been identified from the Aster multispectral data collected previously). Previous exploration performed around Aroona Gate and the zinc anomaly had failed to identify it, and Perilya now believed that the recent rains which the area had received had exposed the haematite altered dolomite and by dint of fresh erosive action, had generated the anomalous soil. No significant geochemical results were returned from the NW Aroona or AST-06 prospects.