During licence Year 6, on renewed EL 4662, Monax and its JV earn-in partner OMM undertook auger soil geochemical sampling, ground magnetic and IP surveys, and exploratory drilling in their continuing search for economic iron ore and manganese...
During licence Year 6, on renewed EL 4662, Monax and its JV earn-in partner OMM undertook auger soil geochemical sampling, ground magnetic and IP surveys, and exploratory drilling in their continuing search for economic iron ore and manganese mineralisation, and now also for graphite mineralisation, in response to shifting commodity economics. In June-July 2010, regional soil geochemical bulk sampling via auger drilling was performed at 435 sites along three traverses made at each of the Francis and Windyzell prospects, and the bulk samples were laboratory assayed for the standard manganese suite. No significant manganese anomalies were defined, but highly anomalous iron was reported at the Francis prospect (max 23.11% Fe). In January 2011, to assist in targeting potential manganese enrichments associated with BIF horizons, ~180 line km of ground magnetic survey readings were acquired by Monax along lines spaced 25 m apart over the Jamieson Tank South, Windyzell, Hodgins and Bunora West prospects. In March 2011, an RC/RAB drilling campaign of 62 inclined holes for 3317 m tested the southern extension of the Jamieson Tank prospect plus the Polinga, Windyzell, Bunora West and Hodgins prospects. A total of 600 x 3-metre composite drill cuttings samples were assayed. Three holes were drilled at the Bunora West prospect for a total of 177 m. No significant manganese intercepts were reported. Ten holes totalling 525 m were drilled at the Windyzell prospect. No significant manganese intercepts were reported. Thirteen holes totalling 749 m were drilled at the Polinga prospect. The only significant manganese intercept was 4 m @ 14.2% Mn in hole PRC010 (50-54 m). Thirty one holes totalling 1625 m were drilled at Jamieson Tank. The only significant manganese intercepts were: - 2 m @ 16.6% Mn (hole JTRC150 interval 13-15 m) - 1 m @ 16.6% Mn (hole JTRC173 interval 4-5 m) - 1 m @ 14.5% Mn (hole JTRC156 interval 14-15 m). Six holes were drilled at the Hodgins prospect to follow up surface samples grading up to 37% Mn. Best downhole intercepts included: - 10 m @ 29.2% Mn (hole HRC05 interval 46-56 m EOH) - 20 m @ 23.8% Mn (hole HRC05 interval 22-42 m) - 11 m @ 20.8% Mn (hole HRC03 interval 9-20 m) - 14 m @ 16.8% Mn (hole HRC01 interval 32-46 m). Hole HRC05 containing the highest grade manganese had only four samples which reported <14% Mn (5.9 – 12.7% Mn). Overall the hole contained 52 m @ 21.2% Mn (4-56 m). In July 2011, an induced polarisation survey was undertaken at Hodgins prospect to follow-up on the high grade manganese occurrence in hole HRC005. This IP survey comprised two stages. The first was a dipole-dipole IP (DDIP) survey over the drilled traverse at the Hodgins prospect, using a DDIP array designed to provide a cross sectional view of both chargeability and resistivity properties of the rocks intersected in the drilling. The second stage was a two-dimensional gradient array IP (GAIP) survey made over a wider area, to try to detect signals arising from any significant manganese accumulations present along strike to the north and south of the past drillhole intercept. Data obtained by both stages of the survey proved problematic to model and interpret, and did not provide much usefulness for drill targeting. Over the period December 2011 to January 2012, another, GAIP survey was conducted at the Jamieson Tank and Polinga prospects. IP chargeability features discerned at the former were attributed to graphite-rich metasediments, but a significant apparent resistivity anomaly disclosed at Polinga was thought to represent a new manganese bearing horizon which warranted further investigation, because of the hole PRC010 intercept already obtained there. During licence Year 7, Monax and OMM undertook rock chip geochemical sampling, sample petrological examinations, graphite beneficiation testing, and two drilling programmes. At the end of the year OMM elected to withdraw from the farm-in agreement, meaning that Monax thereby retained 100% interest in the ferrous metallic minerals present on EL 4662. The first drilling campaign of 45 angled RC/RAB holes totalling 2306 m was undertaken in March-April 2012 to test the gradient IP anomalies at the Hodgins, Jamieson Tank and Polinga prospects for manganese and iron mineralisation. This drilling was unsuccessful, revealing no significant mineralisation. 297 downhole samples were assayed. Due to the poor drilling results, Monax decided to switch its attention onto graphite exploration. To start with, 54 rock chip samples were collected on five graphite prospects selected from AEM survey data and from historic report mentions, and these were assayed for their total graphitic carbon content (TGC). Next, a drilling campaign of 40 angled RC, RAB and aircore holes for 2908 m was conducted in July-August 2012 to evaluate several prospects named Wilclo, Balumbah, Lacroma, Cut Snake and Wilclo South. 788 downhole samples were submitted for laboratory assaying. Best results were obtained at Wilclo South, with intercepts of 15 m @ 16.3% TGC and 9 m @ 14.8% TGC. Fifteen samples comprising rock chip samples and samples from RC drillholes were submitted for petrological examination to determine the samples' graphite content and flake size. During licence Year 8, Monax acquired a ground EM survey which was followed up by drilling, with downhole sampling done for geochemistry and petrology. Drilling of 83 RC holes and 2 diamond holes at the Wilclo South graphite prospect enabled calculation of a resource. In January-February 2013, ~22 line km of moving loop ground EM coverage was acquired at four prospects along 18 east-west lines, when a total of 340 in-loop and slingram MLEM soundings were recorded using a two-turn 100 m x 100 m transmitter loop, deployed at either 50 m or 100 m station intervals. Resulting EM data were processed to produce models in order to aid the planning of drill hole locations, particularly at Wilclo South. In February-March 2013, Monax drilled 77 angled RC holes for 7307 m plus 2 inclined diamond cored holes for 233.2 m to delineate a resource at Wilclo South, and then proceeded further west to the Francis prospect where a single hole was drilled to test a magnetic target for iron mineralisation and another 7 holes for 612 m separately tested the graphite potential of a highly conductive ground EM anomaly. 2580 drill cuttings samples were laboratory assayed, and 19 selected samples were submitted for petrological examinations in polished sections and thin sections to determine the graphite content, mode of distribution and flake size. In November 2013, Adelaide-based AMC Consultants completed calculating a maiden JORC Inferred Mineral Resource for Wilclo South. The modelled global resource was 6.38 Mt @ 8.8% TGC (using 5% TGC cut-off), with a high-grade component of 1.75 Mt @ 12.5% TGC (using 10% TGC cut-off). During licence Year 9, after ownership of the subject licence was transferred to Pirie Resources, attention remained focussed on the extraction of flake graphite from the Wilclo South resource and the identification of additional flake graphite occurrences. For achieving the latter, 29 angled RC holes for 1829 m were drilled at seven prospects to test previously undrilled EM anomalies. At Wilclo, Wilclo South, Balumbah, Argent and Cut Snake, 14 holes encountered graphite, but only as narrow intercepts of mostly flake style mineralisation. However, an earlier assessment of surface exposed graphite at the Argent prospect, done using only hand knapping, had liberated clean graphite specimens with the size of flakes measured in some ranging in length from 1000 microns to 6000 microns, indicating a rare occurrence of exceptionally coarse graphite. Therefore this prospect will be given priority for future drilling work, particularly in the vicinity of a prominent EM high which has been termed 'Galaxy', where information at depth is currently lacking. Operator Archer Exploration conducted intensive bench scale metallurgical testing of large composite drill cuttings samples taken from hole WG045 in the oxide zone of the Wilclo South graphite deposit. The mineral separation processes used to obtain a concentrate were of conventional kind, including grinding in a rod mill, froth flotation, and then sieve partitioning into sized fractions before batch beneficiation on a shaking table and Haultain super-panner. This procedure yielded Extra Large, Large, Medium and Fine classes of flake graphite at respective grades of 91 to 93% graphitic carbon, separated at inferred recoveries of between 42% and 55%. The shape of the recovered flake particles showed that there had been a high degree of graphite liberation from the predominantly quartz gangue, suggesting that there would be efficient recovery of graphite at relatively coarse grind sizes. It was expected that concentrate grades from Wilclo South could be improved with further processing steps such as light regrinding of the flotation sink fraction plus subsequent recleaner stages of flotation and tabling. During licence Year 10, no field work was done. An unsampled graphite drill intercept recorded by Monax in 2012 from hole WG021 on the Lacroma prospect, which appeared to give rise to a far stronger EM response than the EM anomaly drilled nearby by Archer in 2014, was investigated by sampling the drill cuttings of that hole and subjecting them to the above described beneficiation process. A graphite concentrate was produced grading 98.6% graphitic carbon, which was unexpectedly revealing, so much so that Archer now thinks that, based upon its EM signature, the Lacroma prospect graphite resource may have the potential to dwarf the Campoona Shaft -Campoona Central prospect's 2.5 Mt resource on EL 4693 [see Env 11188]. During licence Year 11, on renewed EL 5815, no field work was done. Commitments for this licence were combined with those of several others held by Archer under a recently negotiated Amalgamated Expenditure Agreement (AEA, for the Central Eyre Peninsula Graphite Project), which had first been endorsed by DSD in September 2015 due the company’s focus on finding and developing graphite deposits there. Because a condition of the AEA requires that some project ground is to be relinquished annually, two separate portions of ground totalling 164 square km or ~16.4% of the previously held area of EL 5815 were relinquished from it by Archer on 19/10/2016. Archer continued to evaluate the promising graphite potential of the Lacroma prospect by reviewing historic drillhole data, with the intent of conducting further sampling and beneficiation testing of mineralised intercepts. Another activity that was started, as a response to the global mineral market's recent rapid evolution of a “green economy”, involved making a desktop assessment of the lithium and cobalt potential of the tenement. Historical rock chip and drill sample geochemical data were reviewed to look for anomalous amounts of these elements. Although pegmatites are numerous on the Eyre Peninsula, Archer learnt that to date none have been found to contain lithium. Also, it appeared that the potential for cobalt occurrences may be restricted to manganese enriched rock units. During licence Year 12, activities were again focused on the AMA with the submission of the MLP for Campoona Graphite Mine Project. A limited re-sampling program of historical drill samples (190 samples from 23 drillholes) was undertaken to examine the cobalt potential. No on ground activities were undertaken, a review of the potential for the manganese at Jamieson Tank to be made into an economic product was commenced.