Data release - as updated [made at SA Director of Mines’ discretion] : Yadlakina Hut. Annual reports for the period 20/9/2010 to 19/9/2018.
Published: 09 Oct 1918 Created: 12 Nov 2024 Revised: 12 Nov 2024

An area of outcropping magnesite-bearing metasediments extending from 10 km west of to 55 km north-west of Leigh Creek township is being explored to re-assess its commercial potential for magnesia and magnesium metal production, following other...

An area of outcropping magnesite-bearing metasediments extending from 10 km west of to 55 km north-west of Leigh Creek township is being explored to re-assess its commercial potential for magnesia and magnesium metal production, following other companies' earlier work a decade ago. It is hoped that recent technical developments in metallurgy will give a better chance of successfully exploiting the known magnesite deposits here. No field work was done in licence Year 1, but existing stockpiled 'ore' at the Mount Hutton deposit was sampled for the purpose of conducting metallurgical processing trials, with a focus on the material originating from Bed 9 at this deposit. Initial bench scale test work was performed at the Ian Wark Research Institute on the Mawson Lakes Campus in Adelaide, SA. It aimed to be able to reduce the overall silica content in the final product to close to 1%. However, by late April 2011 it was found that such a goal could not be achieved yet. Other work commissioned from this laboratory was to examine the preferential segregation of MgO in rock grind size fractions, and to do scoping work on thermal analyses. Reports on the outcomes are appended to the subject tenement's first annual report. Later in the year, the assistance of Amdel was sought for determining the compressional strength of the ore host rock, and for that company to also study how to beneficiate the Mount Hutton ore to remove silica from it. This work is ongoing. During licence Year 2, the results of recent laboratory metallurgical testwork were reported, and are included herein. Amdel has continued to evaluate how best to grind the magnesite-bearing material to a variety of fine sizings to optimise the recovery of MgCO3, using batch flotation tests to determine recoverable product. As well, attempts were made to develop a calcined product for sale. This testwork again was concentrated on samples obtained from Bed 9 at Mount Hutton, a unit identified by the previous owner as the most promising of the units that they had mined to date. Remnant stockpiles from the mining exist on the EL, and the material was sourced from them. It has still not been possible to reduce the overall silica contamination in the final processed material to close to 1%. During licence Year 3, further ways of improving the grade and purity of the processed magnesite were investigated, which were aimed at obtaining a further 1% reduction of SiO2 in the periclase calcined product by selective screening done after crushing it, in order to remove contaminant mineral phases. Other, ore attritioning trials were also planned, that would remove talc and chert veins in the +3cm size range by preparatory coarse crushing done prior to calcining. However, the programme of metallurgical testing was later stopped because Archer Exploration became aware of the fact that Magnesium Developments Limited had made an application to DMITRE, in the form of a plaint set before the Wardens Court, that might allow it to resurrect its tenure of several expired former mineral claims covering the Mount Hutton resource, as a prelude to making application for the grant of an extractive minerals lease. During licence Year 4, the licensee was obliged to resort to legal avenues to try to protect the resource and mined ore stockpiles at Mount Hutton from intrusive mining proposed by Magnesium Developments, since that company had submitted a competing EMLA (extractive minerals lease application) to DSD that would allow such activity to occur. The threat of legal action made Magnesium Developments withdraw its plaint, and thereafter DSD rejected the EMLA. Later on, an out-of-court settlement was reached between the opposing parties, at a deal of expense to Archer Exploration, that finally allowed the licensee to access important raw data pertaining to the Mount Hutton resource. No technical work was undertaken during this reporting year. During licence Year 5, Archer Exploration reviewed the historic intellectual property and data which it had acquired (three hitherto unsighted consultant's technical reports are appended to the 2015 ATR as evidence of this significant progress in understanding the project's feasibility). 17 kg of raw magnesite from Bed 9 was crushed in Adelaide and sent to a laboratory in Perth to determine its suitability for making a commercial product. During licence Year 6, the first of renewed EL 5730 which covered the same area as previously, Archer Exploration did little new work. Stockpiles of magnesite-bearing rock material were examined at the Mount Hutton Central deposit mine dump to try to identify which beds had been mined in the former test pit. Each of the stockpiles, as assigned a source bed identity within Beds 1 to 17, was sampled for laboratory assaying, but it was not possible to define original point locations for these samples. Another single mine dump sample obtained at the Pug Hut magnesite occurrence was similarly treated. Crushed raw magnesite from Bed 4 on EL 4729 was tested by Archer's metallurgical consultant for its mineralogical composition, prior to submitting it to the CSIRO for conducting investigations into removal of silica impurities. An updated, JORC 2012 - compliant Measured and Indicated mineral resource estimate, dated 5/4/2016, was prepared by Wade Bollenhagen of Archer Exploration for the Mount Hutton Central magnesite deposit on EL 5730, and was submitted to the ASX. In total it is 17,523 kt @ 40.2% MgO (with no cut off grade applied). During licence Year 7, a trial was completed during the reporting period, whereby a parcel of 120t of magnesite was calcined. Part of this calcination trial was to determine if the kiln could reach temperatures to create Monolithic Dead Burned Magnesia (MDBM), which required temperatures of roughly 1400?C. Investigations into the marketing of final magnesia products are still ongoing. During licence Year 8 no field work was undertaken. Investigations in to the marketing of magnesia products is ongoing.

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About this record

Record No mesac27435
Topic Geoscientific Information
Type of Resource Document
Category Type
Document Type Mineral Company Report - Mineral Exploration
Contributor University of South Australia. Ian Wark Research Institute
Sponsor Archer Exploration Ltd;Anderson, G.
Tenement
Tenement Holder Leigh Creek Magnesite Pty Ltd
Operator Archer Exploration Ltd
Geological Province Adelaide Geosyncline
Mine Name Mount Hutton magnesite mine;Bed 9
Stratigraphy
Commodity
Notes
Notes: This release to the public of the subject mineral exploration data, namely, company data which was acquired more than 5 years ago, is being done by DMITRE in accord with the provisions of Section 77D of the Mining Act 1971 and Regulation 88...

Notes: This release to the public of the subject mineral exploration data, namely, company data which was acquired more than 5 years ago, is being done by DMITRE in accord with the provisions of Section 77D of the Mining Act 1971 and Regulation 88 of the Mining Regulations 2011. Includes: - Bollenhagen, W. (Archer Exploration Ltd), 7/6/2016. Report on [Mineral] Resource [estimation], Mount Hutton Central [magnesite deposit]. Appx 2 of EL 5730 sixth annual report to 19/9/2016. 76 pages, figures, references, tables. Geographic Locality: North-western Flinders Ranges;Yadlakina Hut;Termination Hill;Mount Playfair;Mount Parry;Norwest Fault Doc No: Env 12209

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Language English
Metadata Standard ISO 19115-3

Citations

Use constraints License
License Creative Commons Attribution 4.0
Persistent identifier https://pid.sarig.sa.gov.au/document/mesac27435
Citation Bollenhagen, W.J.;Quast, K.;Provatas, M. 1918. Data release - as updated [made at SA Director of Mines’ discretion] : Yadlakina Hut. Annual reports for the period 20/9/2010 to 19/9/2018. Mineral Company Report - Mineral Exploration
https://pid.sarig.sa.gov.au/document/mesac27435

Technical information

Status
Maintenance and Update Frequency
Geographic Reference GDA2020 (EPSG:7844)
Geo bounding box {"type":"Polygon","coordinates":[[[137.5,-31],[138.5,-31],[138.5,-30],[137.5,-30],[137.5,-31]]]}
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