An area located within the western Adelaide Fold Belt adjacent to the eastern margin of the Gawler Craton, and centred approximately 20 km south-east of Port Augusta, has been explored for possible economic buried copper mineralisation associated with the long-lived Mount Remarkable Fault. Proposed exploration activity during licence Year 1 was hampered by the company's growing awareness of the sensitivity of the land intended to be explored, because this land is viewed by many locals as not to be mined or explored, although in strictly legal terms it lies within the bounds of the Mount Remarkable National Park which is gazetted as a 'dual access' park, allowing for approved entry to conduct closely monitored mineral exploration activities. Archer's original intention was to access a property containing the historic Spring Creek copper mine, in order to evaluate the prospect's potential by using currently disturbed areas as sites from which to drill test for any depth extensions to the Spring Creek lode, and thus obtain subsurface geological information for refining mineralisation models. The preferred model to be tested initially was skarn - based, whereby inferred Hiltaba Suite - derived copper and/or gold mineralising fluids travelling through the fault zone at depth would have “seen” the Brighton Limestone as a favourable host unit for precipitation of base metal sulphides and precious metals. Previously attempted mine appraisal drilling in the 1950s and 1960s did not test the probable lode extent adequately, and the prevailing perceptions then about the prospect's economic value are now much outdated. The inaccessible, flooded underground workings of the mine itself are now used as a groundwater source for supplying the local town of Wilmington. A WNW-trending structure recognised on filtered aeromagnetic data images as lying to the north of the Spring Creek mine became Archer's main target of ongoing exploration interest, being where it planned to conduct initial surface rock chip geochemical sampling once the appropriate land entry permissions had been obtained, that were sought as part of a Declaration of Environmental Factors which was submitted to PIRSA. In late 2011, during licence Year 3, PIRSA responded to Archer's DEF proposal by requiring the company to take pre-disturbance photographs of its proposed rock chip sampling sites, and then rehabilitate them after the samples' removal. However, deciding how it would adequately satisfy the second of these requirements stalled Archer's intended work progress, such that no rock chip samples were collected over the next two years, while an acceptable method of rehabilitating surface rock chip sites was investigated by it. Two successive partial surrenders of licence ground, each comprising 25% of the original granted area, were made on 14/4/2011 and on 14/4/2014 to acknowledge the lack of exploration expenditure so far incurred relative to the licence's spending commitment. In 2015, during licence Year 6, 13 selected grab sample loose rock hand specimens of dispersed float ore and gangue materials that had clearly originated from the abandoned mine workings were collected by Archer, comprising examples of ferruginous breccia, cherts, and other silicia rich wall rock metasediments. Elevated copper was detected in all of these [source locations unknown] samples by laboratory assaying, providing encouragement to the company to persist in the aim of drill sampling the known buried lodes from new drillhole collar sites that would be located in currently disturbed ground. However, difficulties with arranging logistically and geologically suitable [to test mineralisation models] drill collar sites delayed progress on planning the desired drilling programme. During licence Year 7, Archer was given permission by SA Water, the mine property owner, to enter and sample the old still open underground mine workings that are readily accessible above the water table. So the faces of access tunnels lying peripheral to historic open stopes, plus several rock pillars remaining within those stopes, were respectively channel sampled and point sampled for assaying (50 samples taken). Three separate drives which cross-cut the local strata were sampled, and the results obtained demonstrated that the multiple high grade copper lodes (with 8 to 10% Cu) have a halo of mineralisation averaging 1 to 3% Cu. Point sampling of remnant pillars, within the one stope which was accessible on the only level sampled within the mine, returned grades up to 8% Cu, which mirror recorded historic mined grades (the SA Government Department of Mines' Mining Review 25 for July-December 1916 records that in the lower stopes now underwater, face sampling of remnant pillars which was done by SADM back then returned grades ranging from 2.2 to 8.9% Cu). All of the mineralisation that was seen by Archer within this particular uppermost stope consists of the copper carbonates malachite and azurite. Archer next began planning to source a small underground diamond drill rig which it could use to drill a series of fan holes designed to intersect extensions to all of the mined-out the stopes which may exist below the mined out areas. Such drilling started from underground would determine the width and grade of the en echelon mineralised pods present within the cross-cutting breccia. It was decided that additional future drillholes would be orientated in directions to test for unmined pods, primarily below the 410 Level cross-drive which heads out towards the known North and South breccia contacts. The presently known area of the breccia at this level is ~100 m x 70 m (strike). As well, a number of deeper directed holes could also be drilled, seeking to identify primary copper sulphides below the supergene envelope. The company's detailed proposal for performing this underground drilling, plus an accompanying Proposal for Environmental Protection and Rehabilitation (PEPR) [included herein as Appx B to the EL 5540 2015-2016 annual report] was submitted on 21/9/2015 to both DSD and SA Water. No further work occurred within the subject licence area over the ensuing two and a half years, before a decision was made near the end of Year 9 to fully surrender tenure. In its final report giving notice, Archer commented that this decision was primarily caused by a lack of official support received for its efforts to access the Spring Creek mine and surrounds to undertake drilling.