IRW-PRESS: Altona Mining Ltd.: Altona Mining
: TURKEY CREEK Erste Vorratsschätzung
TURKEY CREEK - ERSTE VORRATSSCHÄTZUNG
- Erzvorrat Turkey Creek von 11,3 Mio. Tonnen mit 0,46 % Kupfer für 52.100 Tonnen enthaltenes Kupfer.
- Die Lagerstätte Turkey Creek liegt unmittelbar neben der geplanten Aufbereitungsanlage.
- Erzvorrat des Kupferprojekts Cloncurry liegt bei 86 Mio. Tonnen mit 0,50 % Kupfer und 0,07 g/t Gold für 427.000 Tonnen enthaltenes Kupfer und 205.000 Unzen enthaltenes Gold.
- Vorratszunahme verlängert die Lebensdauer der Mine auf 13 Jahre.
- Vorratszunahme wird Projektrenditen verbessern.
- Turkey Creek wird bei Beginn des SRIG-Joint-Venture
in die Projektoptimierung eingeschlossen.
- Investitions- und Betriebskosten haben sich erwartungsgemäß seit 2012 DFS und 2014-Update verbessert. Altona Mining
Limited (Altona oder das Unternehmen - http://www.commodity-tv.net/c/mid,3159,Companies_und_Projects/?v=286622) gibt die erste Erzvorratsschätzung für die Lagerstätte Turkey Creek bekannt. Diese Lagerstätte liegt auf dem sich zu 100 % im Besitz des Unternehmens befindlichen Kupferprojekts Cloncurry in der Nähe von Mt Isa, Queensland.
Das Kupferprojekt Cloncurry ist Gegenstand eines geplanten 330-Mio.-AUD-Joint-Venture
(JV) mit Sichuan Railway Investment
Group (SRIG) (siehe Pressemitteilung vom 2. Juni 2016 für weitere Informationen über das SRIG-JV).
Das geplante Bergbauprojekt Little Eva liegt innerhalb des Projekts Cloncurry. Turkey Creek liegt 1,5 km östlich der geplanten Tagebaumine Little Eva und innerhalb von 650 m einer geplanten Aufbereitungsanlage mit einer Kapazität von 7 Mio. Tonnen pro Jahr, die auf den gewährten Abbaukonzessionen liegt (Abbildungen 1 und 3).
Folgend die Vorratsschätzung:
11,3 Mio. Tonnen mit 0,46 % Kupfer Kupfer für 52.100 Tonnen enthaltenes Kupfer.
Diese Erzvorratsschätzung wurde basierend auf der Integration in den Minenplan der Mine Little Eva durchgeführt. Der Minenplan für die Entwicklung der Mine Little Eva wurde in dem der ASX am 13. März 2014 vorgelegten Update der endgültigen Machbarkeitsstudie dargestellt. Die Tagebaugrube Turkey Creek wird 1,15 km lang und 175 m tief sein (Abbildung 2) und Sulfiderz an die geplante nahe gelegene Aufbereitungsanlage Little Eva liefern. Zurzeit sieht der Minenzeitplan den Abbau von Turkey Creek gegen Ende der Projektlaufzeit vor.
Der Vorrat basiert auf Ressourcen, die mit einem unteren Cut-Off-Gehalt von 0,3 % ausgewiesen wurden und als vermutliche Ressource klassifiziert ist (siehe Pressemitteilung vom 18. März 2015). Eine detaillierte Zusammenfassung der dahinterstehenden Daten und der Methodik finden Sie in Tabelle 3 (Tabelle 1 des JORC Code 2012).
Der Vorrat besteht vollständig aus Sulfiderz, das zwischen 25 m und 160 m unter der Oberfläche lagert. Eine Oxidationszone, die sich von der Oberfläche bis in Tiefen von 25 m bis 45 m erstreckt, wurde in die Schätzung nicht eingeschlossen, da im Rahmen der Flotationstestarbeiten (Sulfidierung) keine akzeptablen Ausbringungsraten erzielt wurden.
Folgend der gesamte Erzvorrat des Projekts Cloncurry:
86 Mio. Tonnen mit 0,50 % Kupfer, 0,07 g/t Gold für 427.000 Tonnen enthaltenes Kupfer und 205.000 Unzen enthaltenes Gold.
Eine vollständige Aufschlüsselung der Vorratsschätzung finden Sie in Tabelle 1. Die Erzvorratsschätzung ist in der Ressourcenschätzung Turkey Creek eingeschlossen (Tabellen 2 und 3).
Ein Neuentwurf der Infrastrukturanordnung für das Projekt wurde angefertigt, um eine Tagebaumine auf Turkey Creek (Abbildung 3) unterzubringen. Eine Nachbesserung für die Umweltbehörde wurde ebenfalls angefertigt, um die Änderungen im Betriebsplan zu berücksichtigen.
Die aktuelle Lebensdauer der Mine beträgt 11 Jahre und in Anbetracht der Bemessungskapazität der Aufbereitungsanlage von 7 Mio. Tonnen pro Jahr wird Turkey Creek die Lebensdauer der Mine um ungefähr zwei Jahre verlängern. Die zusätzlichen Jahre und der Aufschub der Aufbereitung von niedrig-haltigem Haldenmaterial werden die Projektrenditen gegen über jenen im Update der endgültigen Machbarkeitsstudie angegebenen verbessern.
Der Finanzabschluss der geplanten Joint-Venture
-Transaktion mit SRIG wird für den 31. Oktober 2016 anvisiert. Eine Optimierung des Projekts ist nach Beginn des JV beabsichtigt, um Turkey Creek in den Minenplan aufzunehmen und die Kosten und andere Eingangsgrößen im 2012-DFS und seinem 2014-Update zu überarbeiten. Man erwartet eine wesentliche Verbesserung der Investitions- und Betriebskosten.
Für Fragen wenden Sie sich bitte an:
Alistair Cowden Managing Director Altona Mining
Limited Tel: +61 8 9485 2929 firstname.lastname@example.org
David Tasker Professional Public Relations Perth Tel: +61 8 9388 0944 David.Tasker@ppr.com.au
Jochen Staiger Swiss Resource Capital AG Tel: +41 71 354 8501 email@example.com
Über Altona Altona Mining
Limited ist ein an der ASX notiertes Unternehmen, das sich auf das Projekt Cloncurry in Queensland, Australien, konzentriert. Das Projekt beherbergt Mineralressourcen, die ungefähr 1,65 Mio. Tonnen Kupfer und 0,41 Mio. Unzen Gold enthalten. Die erste vorgesehene Entwicklung ist die Kupfer-Gold-Tagebaumine Little Eva und Aufbereitungsanlage mit einer Kapazität von 7 Mio. Tonnen pro Jahr. Altona hat eine Rahmenvereinbarung mit Sichuan Railway Investment
Group zur vollständigen Finanzierung und Entwicklung von Little Eva geschlossen. Little Eva ist genehmigt mit einer geplanten Jahresproduktion1 von 38.800 t Kupfer und 17.200 Unzen Gold über mindestens 11 Jahre. Eine endgültige Machbarkeitsstudie wurde im März 2014 veröffentlicht.
1Bitte beziehen Sie sich auf die ASX-Pressemitteilung Cost Review Delivers Major Upgrade to Little Eva vom 13. März 2014, die die Information bezüglich dieses Produktionsziels und die prognostizierte Finanzinformation, die auf diesem Produktionsziel basiert, zusammenfasst. Das Unternehmen bestätigt, dass alle wesentlichen Annahmen, die das Produktionsziel unterstützen und die auf diesem Produktionsziel basierenden Finanzprognosen, die in der oben genannten Pressemitteilung erwähnt werden, weiterhin gültig sind und sich nicht wesentlich geändert haben.
Aussage der kompetenten Person
Die Informationen in dieser ASX-Pressemitteilung, die sich auf Explorationsziele, Explorationsergebnisse, Mineralressourcen oder Erzvorräte beziehen, basieren auf Informationen, die von Herrn Roland Bartsch, B Sc (Hons) MAusIMM, MAIG und Dr. Alistair Cowden BSc (Hons), PhD, MAusIMM, MAIG zusammengestellt wurden. Herr Bartsch und Dr. Cowden sind Vollzeit-Mitarbeiter des Unternehmens und verfügen über ausreichendes Wissen und Erfahrung über diesen hier vorliegenden Vererzungs- und Lagerstättentyp. Ihre Tätigkeiten qualifizieren sie als kompetente Personen gemäß den Regeln des 2012 Edition of the Australasian Code for Reporting of Exploration Results, Mineral Resources
and Ore Reserves. Herr Bartsch und Dr. Cowden stimmen den hier eingefügten Informationen, die auf ihren Informationen basieren, in Form und Kontext je nach Erscheinen zu.
Bei Anwendung bezieht sich der Kupfer-Äquivalent auf Kupfer im produzierten Konzentrat oder im Konzentrat einer geplanten Produktion. Es bezieht sich nicht auf den Metallgehalt der Insitu Ressourcen, Vorräte oder Bohrergebnisse. Der Kupfer-Äquivalentgehalt wird für den entsprechenden Vorrat unter Berücksichtigung des Kupfergehalts aus allen Metallen (NSR) d. h. Kupfer, Zink, Gold und Silber
Die Ausgangssprache (in der Regel Englisch), in der der Originaltext veröffentlicht wird, ist die offizielle, autorisierte und rechtsgültige Version. Diese Übersetzung wird zur besseren Verständigung mitgeliefert. Die deutschsprachige Fassung kann gekürzt oder zusammengefasst sein. Es wird keine Verantwortung oder Haftung: für den Inhalt, für die Richtigkeit, der Angemessenheit oder der Genauigkeit dieser Übersetzung übernommen. Aus Sicht des Übersetzers stellt die Meldung keine Kauf- oder Verkaufsempfehlung dar! Bitte beachten Sie die englische Originalmeldung auf www.sedar.com , www.sec.gov , www.asx.com.au/ oder auf der Firmenwebsite!
Table 1: Turkey Creek Deposit Ore Reserve
The Turkey Creek deposit Ore Reserve is reported according to the JORC Code as follows:
Class Tonnes Copper Gold ContaineContaine (million(%) (g/t) d d ) Copper Gold
(kt) (koz) Ore Reserve Proven - - - - - Probable 11.3 0.46 0.00 52.1 0 Ore Reserve 11.3 0.46 0.00 52.1 0 Total
Mining Inventory3.6 0.47 0.00 17.0 0
Notes accompanying the Ore Reserve Statement:
1. Reserves are based upon a Long Term Copper Price of US$3.00 per pound and AUD:USD of 0.80. 2. The cut-off grade is 0.16% copper. 3. Resources have been reported as Inclusive of Reserves. 4. All data has been rounded to two significant figures. Discrepancies in summations may occur due to rounding. 5. The Turkey Creek Mineral Resources are classified as Indicated and Inferred. Pit designs and pit optimisations are based on both Indicated and Inferred Mineral Resource classes. 6. The overall pit comprises 3 stages of mining. Stage 1 and 2 pits are based on a pit shell optimised on Indicated Mineral Resources only. Indicated Mineral Resources within the first two stages have all been converted to Probable Ore Reserves. All Inferred Mineral Resources and Indicated Mineral Resources
within third stage are reported as Mining Inventory.
Table 2: Little Eva Project Ore Reserve
The Little Eva Project Ore Reserve is reported according to the JORC Code as follows:
Reserve Classification Tonnes CopperGold CopperGold (%) (g/t) (tonne(ounce s) s)
Little Eva Proved 31,200,0.64 0.08 198,2084,700 000 0
Probable 22,200,0.50 0.09 109,9062,600 000 0
Turkey Creek Probable 11,300,0.46 0 52,1000 000
Ivy Ann Probable 3,500,00.60 0.08 21,0009,000 00
Lady Clayre Probable 1,000,00.58 0.27 5,800 8,700 00
Bedford Probable 1,430,00.87 0.20 12,4009,200 00 Total
Proved and 70,630,0.57 0.08 399,40174,20 Probable Reserves 000 0 0 (excl. stockpiles)
Little Eva Low Grade Stockpile
Probable 15,400,0.18 0.06 28,10030,900 000
Contained Metal Including CopperGold Stockpile (tonne(ounce s) s)
427,00205,00 0 0
For initial disclosure of Ore Reserves other than Turkey Creek please see Altona ASX release dated 14 May 2012, subsequently updated on 13 March 2014.
Table 3: Summary of Little Eva Project Resources and Reserves
Tonnes Copper Gold ContainedContained (million(%) (g/t) Copper Gold ) (t) (oz) RESOURCES Measured 37.1 0.60 0.09 222,000 112,000 Indicated 73.0 0.52 0.07 376,000 158,000 Inferred 40.1 0.52 0.11 208,000 138,000 Total 150.2 0.54 0.09 807,000 409,000 RESERVES Proven 31.0 0.64 0.08 198,000 84.7 Probable 39.4 0.51 0.07 200,000 89.5 Sub Total
70.6 0.57 0.08 399,000 174.2 Probable 15.3 0.18 0.06 28,000 31,000 (stockpile) Total
86.0 0.50 0.07 427,000 205,000 Mining 5.5 0.49 0.08 27,000 14,000 Inventory
http://www.irw-press.at/prcom/images/messages/2016/36180/21062016_DE_AOH0766_First Reserve Estimate for Turkey Creek.001.jpeg
Figure 1: Project layout with new infrastructure http://www.irw-press.at/prcom/images/messages/2016/36180/21062016_DE_AOH0766_First Reserve Estimate for Turkey Creek.002.png
http://www.irw-press.at/prcom/images/messages/2016/36180/21062016_DE_AOH0766_First Reserve Estimate for Turkey Creek.003.png
Figure 2: Turkey Creek open pit (brown) and resource outlines by JORC class and mineralisation type http://www.irw-press.at/prcom/images/messages/2016/36180/21062016_DE_AOH0766_First Reserve Estimate for Turkey Creek.004.jpeg
Figure 3: Little Eva and Turkey Creek open pit mine and infrastructure layout
Table 3: Table 1 of the JORC Code, 2012 Edition
The table below is a description of the assessment and reporting criteria used in the Turkey Creek Mineral Resource and Reserve estimation that reflects those presented in Table 1 of The Australasian Code for the Reporting of Exploration Results, Mineral Resources
and Ore Reserves (The JORC Code, 2012).
Section 1: Sampling Techniques and Data Criteria Commentary Sampling The drilling dataset incorporates 53 Reverse technique Circulation (RC) holes for a total
of 7,814 s m etres drilling. Samples were collected at 1m intervals to obtain an average 3-4kg weight sample for analysis.
Samples were collected directly using a rig mounted cyclone and cone splitter into pre-numbered calico bags; packed by Altona staff in
bulka bags and shipped by truck for analysis. All samples were analysed at ALS laboratories in Townsville.
Drilling RC using 5.5 face sampling hammers. techniqueHoles were drilled at a dip angle of ~-60o to s intersect mineralisation at optimal true width angles.
Drill Recovery was visually estimated and recorded. sample Recoveries are considered to be excellent recovery averaging > 90%, and typically 100%. Lower recoveries were recorded occasionally in the
hole collars (top few metres). The majority of the samples were dry. Individual samples were collected into the cyclone prior to cone splitting. Cyclone and sampling equipment was checked and cleaned after each rod.
Sample bias due to preferential loss/gain for fine/coarse material is considered well within acceptable limits.
Logging Logging was completed by Altona Mining
geologists at the rig using Altona standard logging procedures.
Representative RC sample chips have been retained for all holes in chip trays.
Logging is qualitative and quantitative including, colour, lithology, mineralisation, alteration, sulphide and oxide mineralogy, sulphide and oxide amount, texture, grain size and structure.
Sub-sampliNo drill core. ng The RC samples were split to 87.5%: 12.5% technique ratio using a cyclone and s and cone sample . preparatiSplitter to obtain a 3-4kg sample for on analysis. The samples were sent to ALS Laboratories in Townsville for sample preparation and analysis. ALS is an independent commercial certified laboratory that uses industry standard sample preparation including drying, crushing and pulverisation.
Sample size >3kg is considered representative for typical copper mineralisation at
Roseby area. Quality All samples were analysed at ALS laboratories of assay in data and Townsville. laborator y Samples were analysed using an Aqua Regia diges tests t using ICPAES and ICP-MS (method code: ME-MS41) for 51 elements. This included copper, with a detection
limit of 0.2 ppm. Data reported from Aqua Regia digestion should be considered as representing only the leachable portion of a particular
analyte. On return of Cu values >1% a second series of analyses were undertaken. This involved an ore grade Aqua
Regia digestion (method code: ASY-AR01) followed by ICPAES analysis, optimised for accuracy and precision at high concentrations (method code: ME-OG46).
Gold was analysed via a fire assay (30g) with an AAS finish, with a lower detection limit of 0.01 ppm and upper detection limit of 100 ppm.
Quality Control included: standards (certified reference materials) from
Geostats Ltd. Standards were inserted into the sampling sequence at 1:20 ratio and included representative material for copper, gold and blanks; and field duplicates taken using a riffle splitter on site for every 20th sample. Laboratory umpire checks were also carried out on sample pulps. The standards were inserted into each sample batch to test the accuracy of the laboratory analysis.
All duplicate and reference data display acceptable accuracy and precision.
No samples were analysed by an umpire laboratory.
No geophysical tools were used to determine the results reported here.
VerificatiResults were checked by several Altona on of personnel. sampling and No twinned holes. assaying All field logging data was done using laptop and uploaded into the company
Datashed database and validated by company database personnel.
All assay files were received in digital format from ALS Laboratories. Data was uploaded into the Altona
Datashed database and validated by company database personnel. No manual data inserts took place.
No adjustments have been applied to the results.
Location Collar locations have been surveyed using of data Altonas own DGPS with approximately 0.1 points metre horizontal accuracy. Elevation accuracy is considered to be less than 0.5 metres and has been verified against detailed ground survey previously completed in the area.
Down hole surveys were completed at the end of each hole within drill rods by Altona personnel using a non-magnetic Gyro tool for azimuth and dip.
The Grid is GDA94 MGA Zone 54.
Data 100 metre (section spacing along strike) and spacing 50m (down dip) with typically two or three and holes per distribut section. ion Consistent 1m sample intervals are maintained through the mineralised domains.
Unmineralised samples (determined in the field using a
Niton handheld XRF device) were composited for check analysis into 3m intervals by the laboratory in accordance with standard Altona procedures.
OrientatioMineralisation strike is approximately north - n of south and swings to the east in the
data in northern part of the deposit. Drilling was relation towards the west or north as deemed to appropriate. Drilling was completed generally geologica at -60 degree dip and with changing dip of l the mineralisation true widths are estimated structure to be 80% of the down
hole intercepts in the north, 90% in the central area and 80% in the south.
No bias is considered to result from drilling direction.
Sample Samples from RC drilling are collected and security bagged into pre-numbered calico bags at the drill site during the drilling operation. Unique sample number was retained during the whole process.
Samples were collected and delivered to ALS as they were collected.
Samples were stored in Altona facilities in Cloncurry prior to the transport to Townsville.
All samples were then catalogued and sealed prior to dispatch to laboratory by Altona staff.
Audits or QA/QC samples are routinely monitored by the reviews database manager and geologist on a batch and campaign basis. The accuracy of key elements such Cu and Au, was acceptable and the field duplicate assay data was unbiased and shows an acceptable level of precision.
No external audits or reviews have been undertaken.
Section 2: Reporting of Exploration Results Criteria Commentary Mineral Turkey Creek is within Mining Lease 90125 and tenement Green Hills within Mining Lease 90124. Both and land MLs are 100% owned by Altona Mining
Ltd. tenure status No joint ventures apply. There are agreements in place with the native title holders, the
Kalkadoon people and with landholders. No significant historic sites or national parks are located within the reported exploration sites.
Both Mining Leases were granted in late 2012 and are in good standing.
ExplorationCRA Exploration completed soil surveys, RC done by drilling and mapping at Turkey Creek. Soil other survey and mapping identified the parties mineralisation but drilling failed to intersect mineralisation due to the wrong drilling direction. Xstrata
Exploration drilled two RC holes at the southern portion of Turkey Creek in 2011 intersecting copper mineralisation.
Altona Mining followed with seven RC holes in 2012 extending the mineralisation some 400 metres to the north. Altona Mining
completed an additional 44 RC holes during 2014.
Geology Mineralisation is considered to be hydrothermal,
stratabound and structurally controlled following internal competency, chemical and permeability contrast typical to the
Roseby area metasediments. Mineralisation occurs both as fine grained pervasive dissemination and coarse grained vein hosted. Mineralisation is
sulphidic under shallow, approximately 25 metre, oxidised cap. Copper sulphides include chalcocite, chalcopyrite and
bornite. Majority of the oxide mineralisation consists of
copper oxides (malachite) and silicates. Drill hole Exploration results are not being reported Informatio for the Mineral Resource area. Drill n hole information is provided in the Mineral Resource estimation section.
Data Exploration results are not being reported aggregatio for the Mineral Resource n area. methods
RelationshiExploration results are not being reported p between for the Mineral Resource mineralisa area. tion widths Drilling azimuths are considered to be and approximately perpendicular to the strike intercept and dip of the mineralisation resulting lengths unbiased true widths.
Diagrams Refer to ASX release dated 18/3/2015, Figures 1 to 6.
Balanced Exploration results are not being reported reporting for the Mineral Resource area.
Other Exploration results are not being reported substantiv for the Mineral Resource e area. exploratio n data
Further Additional work in the future will consist of work diamond core drilling for metallurgical
testwork sampling, infill and exploration step-out RC drilling resource definition purposes.
Section 3: Estimation and Reporting of Mineral Resources
Criteria Commentary Database Data used for estimation is stored within a integrity SQL Server database and is managed using
DataShed software. The structure of the drilling and sampling data is based on the Maxwell Data Model.
Drill data is logged directly into digital logging systems and uploaded to the database by the database administrator (Altona Standard procedures since 2006).
Laboratory data has been received in digital format and uploaded directly to the database. (Altona Standard procedures since 2002).
In both cases the data was validated on entry to the database, by a variety of means, including the enforcement of coding standards, constraints and triggers. These are features built into the data model that ensure that the data meets essential standards of validity and consistency.
Original data sheets and files have been retained and are used to validate the contents of the database against the original logging.
Extensive validation of existing collar, downhole survey and assay data was completed. Validation steps included:
· Drillhole collar locations were compared to the topographic surface.
· Downhole deviations of all drillhole traces were examined and problematic surveys were excluded.
· The downhole survey datum was checked to ensure grid transformations were correctly applied.
· All data (e.g. assay, bulk density, RQDs, core recovery) was checked for incorrect values by deriving minimum and maximum values.
· Lithology data was checked to ensure standard rock type codes were used.
· Meta-data fields were checked to ensure they were populated and that the data recorded was consistent.
Site visitsA number of site visits have been undertaken by Mr
Bartsch No site visit has been undertaken by Mrs Standing the independent consultant for the Mineral Resource estimate.
Geological Confidence in the geological interpretation interpreta of the deposit is moderate to high. The tion spatial extent and geometry of separate lithological components is well constrained by geological surface mapping and detailed logging of RC chips, supported by soil geochemistry and geophysical interpretation, including magnetics.
The Turkey Creek deposit, while copper dominat ed, is interpreted as part of the broader Iron-Oxide-Copper Gold (IOCG) style mineral system common to the Cloncurry district.
The deposit extends over 1.8 kilometres in length. Mineralisation occurs at surface, is exposed in sub-crop, and is confirmed through drilling in the main zone down dip to ~140 m vertical depth below surface. - Copper occurs predominantly as primary sulphides in fresh rock and as secondary oxide minerals (malachite) within a thin surficial cap.
Mineralisation is interpreted to be strataboun d , hosted within a sequence of interbedded meta sediments (biotite-schists, biotite-scapolite metasedim ents and marble). The host rocks are altered to carbonate and albite-hematite dominated assemblages.
The drilled mineralised zone has a simple tabular geometry that displays strong continuity, with true widths varying from approximately 10-30 m (southern end) to 30-50 m (northern end). The main portion of the deposit is oriented north and dips 60° to the east; at its northern end, the strike of the mineralisation and host stratigraphy is folded sharply east and dips steeply south. The broader mineralised sheet displays an upper and lower zone of stronger copper mineralisation.
Copper sulphide mineralisation is dominated by disseminated chalcocite and bornite, with subordinate chalcopyrite both disseminated and in carbonate veinlets.
Geological interpretation was completed on a sectional basis; from which geological surfaces were interpolated to create 3D solids for mineralisation and lithology.
There are no alternative detailed interpretations of geology. The geology interpretation has been refined and is believed to be highly robust.
The main mineralisation domains were defined using grade constraints in conjunction with lithological contacts. A nominal cut-off grade of 0.2% Cu was used to define boundaries between mineralised and weakly-mineralised or
unmineralised domains. Two main geological domains (Southern zone and Northern fold area) were defined. The Southern zone was sub-divided into a central low grade domain and two higher grade domains (footwall and hanging wall). Statistical and boundary analysis verified the domain definition.
All domains were subdivided using a base of oxidation surface to separate oxide mineralisation and primary sulphide mineralisation.
Dimensions The main zone of mineralisation extends over 1.8 kilometres in length and dips to the east -60 degrees.
Mineralisation occurs at surface, is exposed in sub-crop, and has been intersected in drilling to ~ 140 m depth beneath the main Southern zone. - The deposit remains open to the east and at depth.
Estimation Drillhole sample data was flagged from three and dimensional interpretations of the modelling mineralised techniques domains.
Sample data was composited to a 1 metre downho le length.
Data has a low coefficient of variation and top-cut grades were not applied.
Copper mineralisation continuity was interpreted from
variogram analyses to have an along strike range of 150 m etres to 250 metres and an across strike range of 20 m etres to 55 metres. Drillhole spacing ranges from 50 metres to 100 metres along strike; on-section spacing ranges from 25 m etres to 50 metres. Maximum extrapolation distance is 35 m etres along strike and up to 50 metres depth, in line with intersections from deeper
drillholes. Grade estimation was into parent blocks of 10 mE by 50 mN on 10 metre benches within the Southern zone and into 10
mE by 25 mN by 10 mRL parent blocks within the Northern fold area.
Estimation was carried out using ordinary kriging at the parent block scale.
Three estimation passes were used; within the Southern zone the first search was based upon the
variogram ranges in the three principal directions; the second search was two times the initial search and the third search was six times the initial search, with reduced sample numbers required for estimation.
Data from the Northern fold area was unfolded and block grades estimated in unfolded space. Three estimation passes were used; first search was based upon the
variogram ranges in the three principal directions; the second search was two times the initial search and the third search was ten times the initial search, with reduced sample numbers required for estimation.
66% of the block grades were estimated in the first pass.
Post-processing of the data by local uniform conditioning was applied to estimate block grades at the selective mining (SMU) scale of 5
mE by 6.25 mN by 2.5 mRL. The estimated copper block model grades were visually validated against the input
drillhole data, comparisons were carried out against the
declustered drillhole data and by northing, easting and elevation slices.
Moisture Tonnes have been estimated on a dry basis. Moisture content has not been tested. Cut-off The Mineral Resource is reported above a 0.3% parameters copper cut-off grade and within 150 m of the surface, to reflect current commodity prices and open pit mining methods.
Mining Planned extraction is by open pit mining. factors Mining factors such as dilution and ore loss or have not been assumption applied s to the resource esitmate.
MetallurgicNo metallurgical assumptions have been built al factors into the resource or models. assumption s Preliminary metallurgical
and mineralogical testing on samples from the sulphide mineralisation from the main zones support recovery and indicate that economic concentrate grades can be achieved.
EnvironmentThe new Turkey Creek resource will be al factors included as a component of the Little Eva or Development Project assumption s coverd by a granted Environmental Management Plan (EMP). Accordingly the EMP will need to be updated to encapsulate its development.
The EMP considers a broad range of environmental considerations including:
· Flora and fauna · Soils · Radiation · Atmospheric emissions · Hydrogeology · Baseline and ongoing studies form part of EMP requirements
Analysis of simulated tailings fluids and solids prepared through laboratory scale test work indicates favourable environmental results for the neighbouring Little Eva deposit. Simulated sulphide and oxide tailings were found to be benign in terms of potential for formation of acidic, saline or metalliferous drainage.
Testwork on Turkey Creek has not been carried out.
By nature of similar setting to Little Eva, in-part shared host rocks and low sulphide content, no adverse environmental considerations have been built into the resource model.
Bulk In-situ bulk density values have been density confirmed
based on physical measurements conducted on dr ill core samples. The average measured densities are: su lphide mineralisation 2.73 t/m3; oxide mineralisation 2.5 9 t/m3. In-situ bulk densities applied to the resource estimate are: oxide mineralised
metasediments 2.5 t/m3; and, mineralised metas ediments 2.7 t/m3 ClassificatClassification for the Turkey Creek Mineral ion Resource is based upon the continuity of geology, mineralisation and grade, using
drillhole data spacing and quality, variograph y and estimation statistics (number of samples used, estimation pass,
kriging efficiency and slope of regression). Mineral Resources
have been classified on the basis of confidence in geological and grade continuity using the drilling density, geological model, modelled grade continuity and conditional bias measures (slope of the regression and kriging efficiency) as criteria.
· Measured Mineral Resources - none defined · Indicated Mineral Resources
- have been defined in areas where drill spacing is 100
metres by 50 metres or less, within a down dip extent of up to 25
metres below the drilling and where grade variance is moderate
· Inferred Mineral Resources
have been defined in areas where extension of
mineralisation is supported down dip and within the eastern extent of the
Nothern fold area. The classification considers all available data and quality of the estimate and reflects the Competent Persons view of the deposit.
Audits or The resource estimate has been internally reviews reviewed by Altona staff.
The geological interpretation, estimation parameters and validation of the resource models were peer reviewed by
Optiro staff. Discussion The assigned classification of Indicated and or Inferred reflects the Competent Persons relative assessment of the accuracy and confidence accuracy levels in the Mineral Resource / confiden estimate. ce The confidence levels reflect production volumes on an annual basis.
Section 4: Estimation and Reporting of Ore Reserves (Criteria listed in section 1, and where relevant in sections 2 and 3, also apply to this section) Criteria Commentary Mineral The geological model used to estimate the Min Resource eral Resource for Turkey Creek was developed estimate by Altona Mining
Ltd, and the block for model/resource estimate was created and conversion reported in March 2015 by to Ore Reserves Optiro. The stated Mineral Resource is inclusive of the Ore Reserve.
Site visits The competent persons are regular visitors to site.
Study statusA Definitive Feasibility Study (DFS) was carried out in 2011/12 for the Little Eva Project and a cost update was completed in 2014. Input parameters for
integrating Turkey Creek into the project were based (and adjusted as required to reflect current conditions) on the DFS. Mine layouts were adjusted to accommodate the addition of Turkey Creek.
The work to incorporate Turkey Creek into the Little Eva project has been compiled as an addendum to the Little Eva DFS.
All material modifying factors have been considered.
Cut-off Minimum cut-off grades for Turkey Creek were parameters calculated at 0.16% Cu. This is based on the ability to mine the resource on an economic basis. The copper price used was based on information on consensus pricing provided by Altona.
Cut-off grade varies over the mine valuation period.
Mining Integration of the Turkey Creek deposit into factors or the Little Eva Project, which envisages a 7 assumptions million tonnes per annum processing facility (SAG/Ball
and flotation circuit) to produce a concentrate.
Several optimisations were carried out based on input parameters from the original DFS and the 2014 update. Pit optimisations were undertaken by independent resource consultancy
Optiro Pty Ltd. and by independent resource consultancy
Orelogy. Orelogy developed pit designs and mine schedules.
The Ore Reserves are reported within pit designs. Designs which are based on bulk mining using conventional load and haul practices, with drill and blast where required.
The pit design was based upon pit shell optimisations of all resource categories (Measured, Indicated and Inferred). Optimisations excluding Inferred resources capture all Measured and Indicated resources.
There are however no Measured Resources. The overall pit slopes used for the pit optimisation were those used for the Little Eva pit design of 40° in the oxide zone and 43°in fresh rock No geotechnical assessment has been conducted however geotechnical logging indicate conditions equal to or better than those seen at Little Eva.
Summary of pit optimisation input parameters:
· Direct mining costs inclusive of Load & Haul, Drill & Blast of A$2.77/t at the surface plus a vertical incremental cost per 10m bench of +
A$0.072/t. · Ore haulage cost from the Turkey Creek pit to the Little Eva plant of
A$ 1.00/t. · Mining recovery 96% . · Dilution 6%. · Processing costs are AU$10.26/t which is inclusive of:
- General and Administration - Sustaining Capital - Grade Control - Ore haulage cost. · Processing recovery for copper 96%. · 25% copper in concentrate with a moisture content of 9% . · Concentrate transport and shipping A$48.75 /t . · Concentrate treatment charge of A$93.75/t concentrate . · Refining costs of A$206.68/t copper metal. · Copper price of A$8,267/t. · Copper payability of 96%.
MetallurgicaOre will be processed through the proposed l factors Little Eva Project process plant at a rate or of 7 million tonnes per annum flotation assumptions circuit to produce a concentrate; the plant utilises industry standard and simple proven technology.
recoveries to copper concentrate
used for pit optimisation are based on detail ed optimised
testwork on the neighbouring Little Eva deposit . Testwork carried out to date on Turkey Creek ore indicates that at a finer grind
size the Turkey Creek ore should perform similarly to the Little Eva ore with respect to copper recovery. Metallurgical
testwork followed flowsheets ba sed on previous studies and results from the Little Eva Project and reflecting the established DFS project process design.
Two programmes of testwork have been conducted. The first testwork programme was completed using composite samples from RC resource drill
hole samples. GR Engineering Services managed the
programme.The second programme used diamond d rill
core holes targeting representative geometall urgical domains within the optimised pit shell.. Alt ona managed this programme. Both testwork programs were conducted by ALS AMMTEC.
The testwork programmes showed that the copper sulphides could be recovered into rougher concentrates at around 93% copper recovery. Optimum response (range 91 to 95% copper recovery) was at a grind size P80 of 106
m and 75 m. More detailed work was performed in the second programme.
At the optimum rougher stage grind sizes of P80 of
106 m to 75 m concentrate grades of 8.5 - 1 2.1 %
copper approximated those achieved on the Little Eva Ore
of 8.7 - 14.7 % copper at a grind size P80 of 212 m. A finer grind gave a higher concentrate grade
which was supported by mineralogical analysis which showed copper mineral (chalcocite, bornite, cha lcopyrite) grain sizes predominantly in the 200 to 30
m range. A single unoptimised cleaner test was conducted on a rougher concentrate sample at a 106
m with regrind at a P80 of 35 m. A high grade concentrate of 32.6%
copper was achieved. The results indicate tha t the Little Eva flowsheet of a coarse grind followed by regrinding of a rougher concentrate is a viable option for the Turkey Creek ore.
Characterisation of the breakage behaviour of mineralisation types from Turkey Creek was undertaken on diamond
drillcore. Sulphide ore is softer than Little Eva ore. Bond work indices ( BRMWi 19.9 and BMWi 14.9) for sulphide ore from Turkey creek are lower than the average determined for Little Eva ore (20.4 and 18.0 respectively) within the lower end of the range of variability displayed by Little Eva ore.
EnvironmentaEnvironmental impact studies have been l completed and an Environmental Authority (EA) was granted permitting the grant of Mining Leases. Amendments to the EA are required to incorporate Turkey Creek into the Project.
An EA amendment application has been prepare d and lodged by MBS Environmental. All necessary studies and designs have been completed for a revised mine layout to include Turkey Creek
to support the amendment. A decision by the Q ueensland Department of Environment and Heritage Protection on the amendment application is pending with no objections from affected parties having been received.
InfrastructuDetails of the proposed project are re described more fully in ASX release of 13 March 2014.
The project is located in an established mining district with close access to required infrastructure. It is approximately 65km by road to Cloncurry.
Concentrate trucked 65km to Cloncurry in half containers on existing sealed roads within 10 km of the plant; containerised rail to Townsville port.
Power supply is to be provided via a proposed 9km line from the Dugald River mine substation. The 220KV power line to bring power from Cloncurry to Dugald River substation is a part of the MMG
Dugald River Project which was approved for development in mid-2015.
Ground water will be sourced primarily from pit dewatering bores at active pits supplemented by permitted dewatering of the
Blackard resource. Blackard is not currently included in the mine plan. Back up water can be
purchased from the Lake Julius - Ernest Henry water pipeline which is 2.5 km from the plant.
A fly-in fly-out work force is to be complemented by local drive in-drive out employees from Cloncurry and Mt Isa. Accommodation will be on site in a 220 man village or in Cloncurry.
DFS mine site infrastructure layouts and designs have been revised by Knight
Piesold (tailings storage facility, drainage diversions) and
Orelogy (waste dumps) to incorporate mining of Turkey Creek.
Costs Appropriate estimating and costing techniques and studies were used throughout this study. Costs were apportioned appropriately to either capital or operating cost categories. The mining costs are those provided by reputable mining contractors based on a mining schedule developed prior to the upgrade in resource model. The processing, engineering and other costs are obtained from: a) quantities determined from material take off; b) direct costs and schedules of rates; c) spare and first fill requirements. All other costs being generated from various studies associated with current activities. Altona.
Revenue The long term copper price used is factors US$6,614/t. Allowances are made for transport charges and royalty charges where appropriate. Any forward product cost projections, exchange rates is based on assessment of the relevant market analys t information. Market There are currently no offtake agreements in assessment place and these will be secured closer to a final investment
decision. It should also be noted that Altona have experience in this market, as they successfully secured offtake agreements for a previous Altona mining operation.
Economic Inputs for the economic analysis are as listed under Mining factors or Assumptions.
Social All access, heritage and compensation agreements required with key stakeholders are in place.
Other Natural risks, such as flooding, have been considered in the design and work undertaken to
mitigate against any ill effects from up to a 1 in 100 year event.
It is considered that the current planning and layout can be developed into a viable operation. However, there are several opportunities which can be
explored prior to implementation which, if completed, will improve the outcome.
All other legal social and government factors have been reviewed and do not show any signs of hindering the viability of the project.
All titles have been checked against the Gove rnment of Queenslands data base and appear in order.
The primary permits required are either already in place. It is not expected that any outstanding permits or required amendments will be an issue as no negative receptors have been identified.
ClassificatiOnly fresh (sulphide) ore has been converted on to Ore Reserves.
The Turkey Creek Mineral Resources
are classified as Indicated and Inferred. Pit designs and pit optimisations are based on both Indicated and Inferred Mineral Resource classes.
The overall pit comprises 3 stages of mining. Stage 1 and 2 pits are based on a pit shell optimised on Indicated Mineral Resources only. Indicated Mineral Resources within the first two stages have all been converted to Probable Ore Reserves. All Inferred Mineral Resources and Indicated Mineral Resources
within the third stage are reported as Mining Inventory.
Audits or No previous Ore Reserves have been declared reviews for Turkey Creek.
Internal peer reviews were undertaken. Consideration of current market conditions (l ower operating costs and lower metal prices ) have been assessed has having an overall positive or neutral impact.
Preliminary pit optimisations conducted by Op tiro are consistent with the outcomes of more expansive work by
Orelogy. Discussion The assigned classification of Probable of Reserve reflects the Competent Persons relative assessment of the accuracy and confidence accuracy levels in the estimate. / confidence The confidence levels reflect production volumes on a Life of Mine and annual basis.
Die englische Originalmeldung finden Sie unter folgendem Link: http://www.irw-press.at/press_html.aspx?messageID=36180 Die übersetzte Meldung finden Sie unter folgendem Link: http://www.irw-press.at/press_html.aspx?messageID=36180&tr=1 NEWSLETTER REGISTRIERUNG:
Aktuelle Pressemeldungen dieses Unternehmens direkt in Ihr Postfach: http://www.irw-press.com/alert_subscription.php?lang=de&isin=AU000000AOH9
Mitteilung übermittelt durch IRW-Press.com. Für den Inhalt ist der Aussender verantwortlich.
Kostenloser Abdruck mit Quellenangabe erlaubt.