AuTECO Minerals Revitalising Pickle Crow

THE CONFERENCE CALLER: Canada-focused AuTECO Minerals (ASX: AUT) wants to make one thing clear – it is not just revitalising an historic gold mine at its Pickle Crow gold brownfield project in Ontario, but is on the verge of establishing a major new gold camp. By Mark Fraser

The Perth-based company is now in the process of updating the project’s resource inventory and is looking to have new numbers in place sometime during the second quarter of 2021.

It plans, however, to also devote part of its current drilling campaign towards looking for further regional targets based on encouraging historical data.

The project, which sits 400 kilometres north of Thunder Bay in the Canadian province of Ontario, clocked up historic production of 3.1 million tonnes grading 16.1 grams per tonne for 1.05 million ounces between 1935-1966.

Although the company is encouraged by the drilling results coming from within the proverbial shadow of the headframe, regional assays have suggested there is more in the area than has previously met the eye.

During his appearance at the 20th RIU Explorers Conference in Fremantle, AuTECO chief operating office Darren Cooke said it was important to note that limited systematic exploration had taken place outside of the immediate Pickle Crow mine area which had revealed broad camp-scale mineralisation and compelling walk-up discovery targets.

Although previous work had shown structures parallel to the main Core Mine shear contained indications of significant gold mineralisation, limited follow-up activities were completed.

Some of these historical regional gold intercepts included 1.7 metres at 36.6 grams per tonne from 15.1m (Springer Shaft), 4.6m at 9.3 grams per tonne from 27.1m, (F Vein), 6.1m at 7.3 grams per tonne from 86.6m (SW Powerhouse) and 6m at 7.7 grams per tonne from 232m (East Pat Shear).

So far AuTECO has completed almost half (around 20,000m) of its 45,000m drill campaign and currently has four rigs on site. Cooke said it was now trying to procure a fifth one to up the field ante.

As it stands the company has already established a resource of 2.8 million tonnes at 11.3 grams per tonne for 1 million ounces.

Its tenure covers 496 square kilometres with 106 patented mining claims, with the regional exploration focus being on the Pickle Lake Greenstone Belt and Sioux Lookout.

Importantly, the project boasts on-site surface and below ground infrastructure including three main shafts, 38km of lateral development, a 225 tonne per day processing plant, a 24 person camp, a 600 kilowatt generator as well as a core processing facility.

In addition it is grid-connected to hydropower.

Cooke said he sometimes referred to Pickle Crow as the “Kundana of Canada” as the project contained numerous analogues to other stand-alone deposits that had been discovered on parallel trends – including the Kundana camp in WA, which has yielded over 9 million gold ounces.

Aside from the fact they are both the same deposit type (Archean orogenic vein), Kundana also has similar host rocks (a mafic sequence with interflow sediments proximal to conglomerates), structural architecture (a multi-phase history with sub parallel shear zones and Riedel shear geometrics) as well as similar mineralisation (both are high grade narrow vein low sulphide quartz-carbonate-scheelite veins with a predominantly steep dip).

Cooke also noted that Pickle Crow was second on a list of emerging tier-1 exploration properties in North America and Australia which have over 1 million ounces in resources, but no reserves.

The first is dual-listed international mining giant Barrick Gold Corporation’s (TSX: ABX; NYSE: GOLD) REN project in the US state of Nevada, which currently contains 1.65 million oz at a resource grade of 13.4 grams per tonne.



Firefly Resources Bitten by the Gold Bug

THE CONFERENCE CALLER: Having spun off its manganese assets into an oversubscribed IPO, Firefly Resources (ASX: FFR) is now set to devote its corporate attention to three predominantly gold exploration plays in Western Australia. By Mark Fraser

The first – which provided a “defining moment” in the company’s evolution when it acquired the asset last year and will take up most of its oxygen in the foreseeable future – is the historic Yalgoo gold project in the state’s Murchison, where the company holds 800 square kilometres of tenure covering real estate that has already yielded 140,000 gold ounces at a grade of 1.57 grams per tonne.

Over the coming year Firefly plans to drill 30,000 RC metres at Yalgoo as part of a resource upgrade. At the moment it has two rigs on site, with the company planning to employ a third rig during March.

The second cab off the rank is the Paterson copper-gold project in WA’s remote east Pilbara, which is currently at the early exploration stage.

Here, Firefly has around 600 square kilometres of highly prospective rocks in the under-explored Paterson Province. So far it has found some interesting copper-gold mineralisation less than 100m below surface – including grades of 6.5% copper, 1 gram per tonne gold and 900 parts per million molybdenum.

Finally, there’s the early stage Forrestonia gold project, which sits 380km east of Perth on the southern portion of the Forrestonia Greenstone Belt, where the company plans to follow up on some small discoveries at a later date.

For the time being, though, the focus is on Yalgoo, where the company is expecting to establish an update resource for the Melville gold deposit while advancing another seven firm gold prospects.

During the second day of the 2021 RIU Explorers Conference in WA, Firefly Resources managing director Simon Lawson said the company held almost 95 per cent of the upper northern part of the Yalgoo Greenstone Gold Belt.

“What I want to drive home to people is that we are pretty much alone on that belt, it’s already proven that it can produce gold and we have a number of different prospects that can become JORC 2012 resources very quickly,” he said.

In terms of the Melville deposit – which produced the aforementioned 140,000 ounces and was last subjected to a resource estimate in 2004 when the (Australian) gold price was $500 per ounce – Lawson noted that it contained thick high grade mineralisation in the main banded iron formation and further high-grade intercepts from 142m, reinforcing the recently discovered mineralised position both to the east and below the historic resource.

Furthermore, there was a broad mineralised oxide profile between the surface and 12m depth.

“One of the things we sort of discovered during the process of reviewing the old data, and during our own drilling, is that there is mineralisation from surface over a very extensive part of this ore body, and we are going to work on that as a separate model with the intention that we would like to commercialise that as an oxide gold opportunity,” Lawson explained.

Outside of Melville, Firefly has seven other prospects at Yalgoo with four of them (City of Melbourne, Brilliant, Lady Lydia, Prince George and Crescent) all having historic resources.

On the day before Lawson appeared at the RIU conference, Firefly announced it had spun out its Oakover manganese assets – located 80km east on Newman in WA – into a $5.5 million wholly-own IPO to be called Firebird Metals.

“The proposed IPO creates value from a non-core asset,” he added.

“Firefly shareholders will see the in-specie distribution of the shares in this company.

“Firefly won’t retain that value – we will give it to our shareholders. We will get a little bit of cash back from the initial IPO, but the majority of that will go out to our shareholders.”


Ardea Resources Goongarrie Resources Upgrade Sparks Interest

THE CONFERENCE CALLER: Following what has literally been decades in the making, 2021 could be the year that marks a major turning point in the evolution of one of Western Australia’s most anticipated critical metals projects. By Mark Fraser

With its Kalgoorlie Nickel Project (KNP), Ardea Resources (ASX: ARL) is confident it is sitting on one of the largest nickel-cobalt ore bodies in the developed world – a boast which is not unreasonable given it has a current resource inventory of 826 million tonnes of ore grading 0.7 per cent nickel and 0.046 per cent cobalt (for 5.8 Mt of contained nickel metal and 384,000t of contained cobalt).

Sitting within the western portion of the KNP tenements just 70 kilometres to the north west of Kalgoorlie-Boulder is the Goongarrie Nickel Cobalt Project (GNCP), which on its own contains resources that extend over 25km of strike.

Here the company has a resource – using a nickel cut-off grade of 0.5% – of 259 million tonnes at 0.7% nickel and 0.046% cobalt for 1.82 million tonnes and 119,200 tonnes of contained metal respectively.

These numbers were the result of a resource upgrade at Goongarrie, which Ardea announced on the day before this year’s RIU Explorers Conference in WA, where the junior presented during the opening day.

While at the podium, the company’s managing director and chief executive Andrew Penkethman was keen to make it clear that this mineralised reboot included the addition of 2,590 tonnes of contained scandium to the inventory.

It also meant the high grade component of the KNP was now 60 million tonnes at 1% nickel and 0.074 per cent cobalt for 595,000 tonnes of contained nickel and 44 tonnes of contained cobalt.

With numbers like this, Penketham suggested, the company is confident it is well placed to provide the world with essential supplies of ethically-sourced nickel and cobalt, along with other critical minerals like scandium and the rare earths duo of neodymium and cerium.

“With our ASX resource update released to the market yesterday, the core takeaway there is the 60 million tonnes at 1 per cent nickel (which) demonstrates high grade continuity,” he said.

“Our current base case is a 2 million tonnes per annum processing plant (at the GNCP), so you can see in sight ample production capacity.

“And again I’d just like to stress that Goongarrie is only the start of the KNP resource update – the next cab off the rank is Highway, located 30 kilometres to the north, so it is within easy hauling distance.”

While WA’s nickel laterite projects have something of a chequered history dating back to the late 1990s when Murrin Murrin, Cawse and Bulong all came on-stream only to be collectively plagued with a slew of ramp-up issues, Ardea is confident its so-called “WINNER” (Water, In-pit Neutraliser and Nickel Enhanced Reserve) strategy will add further value to the development of the GNCP and support the production aspirations of the KNP.

Part of this will involve a resource update of the Goongarrie Line, which is due to be completed during the March quarter, while resource estimation work is – as already mentioned – expected to continue on Highway, which represents a potential high grade satellite ore source for the proposed 2 Mtpa high pressure acid leach (HPAL) planned for the GNCP.

Ardea believes the latest Goongarrie resource update will be another large step forward in this initiative and, in addition to nickel and cobalt resources, will embrace the scandium, manganese and aluminium components.

Follow-up open pit optimisations are anticipated to target over 1% nickel leach feed grade, while plant optimisation will be complemented by mineralised neutraliser.

According to Ardea, neutraliser that can be sourced during open pit mining at Goongarrie is considered a large advantage over peer projects as it reduces the consumables that need to be purchased and transported to site, thereby reducing carbon emissions and lowers operating cost.

Ultimately, the aim is to optimise plant feed grades to the HPAL plant exceeding 1% nickel for at least 15 years. Options such as developing a second GNCP 2Mtpa HPAL train will also be considered, dependent upon the production requirements of the successful strategic partner.



Centaurus Metals Waiting for Jaguar to Roar

THE CONFERENCE CALLER: A busy six months with the drill rig hass merely confirmed what Centaurus Metals (ASX: CTM) has suspected for a while – that its evolving near-surface Jaguar nickel sulphide play in Brazil is a winner. By Mark Fraser

The company is currently in the process of completing two scoping studies for the project and is now hoping to make a decision-to-mine by 2023, with a 20,000 tonne-plus per annum nickel operation pencilled in to start by the end of the following year.

During the fortnight leading up to its appearance at the opening day of the RIU Explorers Conference in Western Australia, the WA-based junior announced it had significantly increased the indicated component of Jaguar’s Global Mineral Resource Estimate (GMRE) by over 50% to 223,400 contained tonnes of the base metal, a development which augurs well for the company’s first base case scoping document due next month.

The project – which is located in northern Brazil’s Carajas mineral province – now has a total GMRE of 58.6 million tonnes of ore grading 0.95 per cent nickel for 557,800 tonnes of contained nickel.

Importantly, the indicated component of this currently sits at 19.9 million tonnes at 1.12 per cent nickel for the aforementioned 223,400 tonnes, representing 40 per cent of the deposit’s GMRE, thanks to the junior’s in-fill diamond drilling campaign conducted over the past half year.

Significantly, the grade of this indicated material is almost 20% higher than the GMRE’s grade, demonstrating the project’s ability for early payback.

Furthermore, as more than 80% of the contained nickel in the global estimate sits within 200 metres from surface, all indications are that a large open pit will initially be established.

The February 2021 GMRE update is based on more than 74,500m of diamond drilling across 267 holes. This included an additional 49 diamond holes, for 8,150m, of predominantly infill drilling that was conducted since the company’s maiden JORC-compliant maiden global estimate was released in June last year.

The primary focus of this infill activity was to convert inferred resources to the indicated category within potential open pit limits.

This involved drilling on a 50 by 50m drill spacing (although there were times a closer spacing was used) at Jaguar South, Jaguar Central, Jaguar North and Onça Preta. Together, these ore bodies represent about 67% of the contained metal in the GMRE. All the core was diamond, while every hole was subjected to down-hole electromagnetic surveys.

According to Centaurus, this work correlated very well with the interpretation of the previous inferred resource. In addition to providing increasing control on the mineralised zones and grade distribution, the closer-spaced drilling also helped develop an important structural model.

The Jaguar Central and Jaguar South deposits are likely to deliver the bulk of the ore during the early years of any future operation and should underpin the project’s base line scoping due diligence.

Centaurus said Jaguar and Onça were unique in the nickel sulphide sector as the high grade mineralisation came to surface and remained open at depth. Significantly, more than 80% of the GMRE’s contained nickel is within 200m from surface.

During his appearance at the RIU show, Centaurus operations manager Roger Fitzhardinge said a second scoping study, which is set to be completed by April, would look at including pressure oxidation (POX) in Jaguar’s circuit.

“POX testing is demonstrating that we get good extraction,” he explained.

“The advantage of POX in producing the nickel metal is that you’ll get paid 100 per cent LME nickel price … which compared to the pay abilities that you might get for a nickel concentrate, which might be 72-75 per cent, is all in the bottom line, so it’s a very attractive case.”



Trigg Mining Declares Lake Throssell Target

THE CONFERENCE CALLER: If there is one compelling reason to invest in specialist sulphate of potash (SOP) explorer Trigg Mining (ASX: TMG) it’s that people have to eat. By Mark Fraser

Describing itself as a modern, purpose-driven exploration house set on helping to deliver global food security, Trigg plans to employ a sustainable “mining” method – the solar evaporation of hyper-saline brine – to produce a SOP premium mineral fertiliser essential for the production of high value agricultural products.

The company controls around 1,585 square kilometres of tenure covering two projects in Western Australia’s north eastern Goldfields, which includes 380 square kilometres of playa lakes and 140km of paleochannels – all of which are prospective for SOP mineralisation.

These projects lie near the terminus of extensive palaeovalley catchment areas
(ancient river valleys) which extend for over 500km and are underlain by potassium-bearing source rocks (namely granites, sandstones and salt diapirs).

Here, brine solutions carrying potassium mineralisation have been concentrating in
the palaeovalleys and salt lakes (evaporite systems) for millions of years.

Trigg’s flagship project, the high-grade Lake Throssell, covers 1,085sqkm and has around 70km of interpreted palaeovalley extent.

So far the highest SOP grade discovered in this tenure has been 14,800 milligrams per litre, while the initial results for the current air core drilling program – drilled to a depth of up to 130 metres – returned an average grade of 9,772 milligrams per litre.

Furthermore, 92% of all samples taken to date have revealed grades exceeding 9,000 milligrams per litre, while 64% are over 10,000 milligrams per litre.

Meanwhile, the junior’s second project – Lake Rason – is currently being seen as a potential satellite ore body.

It covers 500sqkm and includes 194sqkm of playa lake and 64km of interpreted palaeovalley.

Importantly, it already has an inferred mineral resource of 6 million tonnes at 5,080 milligrams per litre SOP and the potential to increase volume and grade to the west, with the western-most hole drilled (LRTAC001) returning results of up to 6,645 milligrams per litre.

Just before appearing at the RIU Explorers Conference in WA, the company announced that recent exploration success had enabled a sizeable initial high grade exploration target to be estimated at Lake Throssell, with outstanding growth potential.

This target was approximately 7.5 to 27 million tonnes at a grade ranging between 9,000 and 10,000 milligrams litre SOP equivalent and covered a strike length of around 70km of the interpreted palaeovalley within a total strike length of about 112km under tenure – including adjacent tenements under application.

Trigg said high grades and multiple potential aquifers were encountered throughout the profile, meaning that trenching and the establishment of deep production bores were possible.

Earlier this month the company also announced that 2021 air core drilling at Lake Throssell, where field work completed in 2020 within the northern half of the project area (16 holes for 1806m representing some 40 per cent of the program), confirmed the presence of a broad palaeovalley at least 1km wide, with some areas potentially broadening up to 3-4km wide.

Assay results were positive, returning high grades of up to 11,519 milligrams per litre SOP (or 11.5 kilograms per cubic metre) with an average grade of 9,772 milligrams per litre SOP.

During her appearance at the RIU conference, Trigg managing director and chief executive Keren Peterson said the company was looking to establish a maiden JORC resource in the second quarter of 2002.

“So that (February 16) announcement – that exploration target – has us very excited because it is substantial,” she noted.

“This is a project that has never had any drilling done until we got out there (last) July.

“And it’s taken a fair bit of innovation … because it is of substantial scale.

“It’s going to be big. It’s going to have a long life when we bring it into production, and it’s got the grade to do that.”

Petersen said SOP was an essential fertiliser for high value, chloride sensitive crops like fruit, vegetables, avocados, coffee beans, grapes, tree nuts, cocoa and anything grown under glass and in arid and acidic soils.

In addition, with the natural endowment of the minerals dissolved in brine and the ability to harvest solar evaporation to produce SOP, brine producers were generally low cost ones.



Azure Minerals Drills Andover, Andover Again

THE CONFERENCE CALLER: If Azure Minerals (ASX: AZS) and Joint Venture partner the Creasy Group continue to tackle 2021 at the same cracking pace they found themselves moving in the field during the second half of 2020, they could find themselves nominated for the Craig Oliver Award at next year’s RIU Explorers Conference. By Mark Fraser

Just eight days before his appearance at the 2021 RIU show, Azure managing director Tony Rovira told the market that an ongoing drilling campaign at the emerging Andover base metals project in Western Australia’s Pilbara had revealed new zones of nickel-copper sulphide mineralisation to the east of the highly prospective VC-23 prospect.

In particular, four new drill holes (ANDD0012, 0013, 0016 and 0017) intersected shallow sulphide mineralisation associated with electromagnetic (EM) conductors at VC-23.

These latest holes followed on from multiple mineralised intersections in the first three ones announced during the second half of January, ultimately resulting in the impressive discovery of mineralisation in seven VC-23 holes.

ANDD0012 intersected 4.6 metres of continuous massive and semi-massive nickel-copper sulphides within a 19.4m-wide mineralised envelope coincident with a previously undrilled EM conductor.

Meanwhile, ANDD0013, 0016 and 0017 demonstrated continuity of sulphide mineralisation over 150m of strike, which remained open both along strike and down-dip.

High nickel and copper grades were subsequently confirmed by pXRF and verified by Azure’s on-site geologists. Two other rigs are now set to continue drilling the VC-7 conductor plate.

During his appearance at the RIU conference, Rovira said the JV partners had – after joining forces in August last year – initially identified 10 targets which indicated bedrock-hosted sulphide accumulations after conducting a number of fix looped surface EM surveys.

The project area, which covers 7,000 square kilometres and sits just south of the small town of Roebourne, had been in the hands of legendary WA prospector Mark Creasy, whose company had carried out a small amount of RC drilling in 2018, intersecting a small amount of nickel and copper mineralisation in the areas which are now known as VC-23 and VC-07.

“In addition to that there are numerous other EM conductors throughout the project and all of them are just waiting there to be drilled – they have never been drill tested, so there are a lot of opportunities on the property for finding bedrock-hosted sulphide mineralisation and potential nickel and copper-rich mineralisation,” Rovira explained.

Rovira said to date a total of 10 diamond holes had been drilled at Andover for 4,200m, with every one of them intersecting nickel and copper sulphide mineralisation.

“One of the holes has drilled over the top of the magnetic conductor and only intersected minor mineralisation, but the other nine all went through the modelled locations and all nine of those hit significant quantities of massive, and semi massive, and other styles of nickel and copper sulphide mineralisation,” he noted.

“So, to date we have tested the eastern 200m strike length of that VC-07 conductor (and) there’s at least another 800m further to the west for us to test, and we are expanding our drilling out along strike and to the west as we go.

“And the drilling is continuing – and at this stage we consider this to be: we’ve identified the body; we have a great understanding of the shape and the potential size of the body. So the diamond drilling we are doing now is with the intention of being able to produce a mineral resource at the completion of the drilling program.

“And importantly where we have drilled into EM conductors we have hit nickel and copper sulphide mineralisation – it is actually a 100 per cent hit rate.”

Azure holds a 60 per cent stake in Andover, while the Creasy Group has the remaining 40 per cent.



Chalice Mining Chasing Polymetallic Performance

THE CONFERENCE CALLER: If all goes to plan, Chalice Mining (ASX: CHN) should unequivocally confirm it is sitting on a potential multi-deposit world class mineral province at its wholly-owned Julimar polymetallic play in Western Australia by the middle of the year. By Mark Fraser

The junior will also be able to say if it has made not only Australia’s first major palladium discovery, but is on the cusp of establishing a very large strategic deposit of critical energy metals.

Located around 70 kilometres north east of Perth, the 26km-long Julimar has so far this year been subjected to a busy field program, with the company employing six rigs (three RC and three diamond) to carry out an initial 160,000 metre step-out and resource definition drill program at the (approximate) 1.6 km by (greater than) 0.8 km Gonneville intrusion.

First pass reconnaissance soil sampling and moving loop electromagnetic programs have also started concurrently in the Julimar State Forest just to the north.

Situated on private farmland and within the forest, the project was staked in 2018 as part of Chalice’s global search for high-potential nickel sulphide exploration opportunities.

The company interpreted the possible presence of a mafic-ultramafic layered intrusive complex (aptly called the Julimar Complex) based on high resolution airborne magnetics.

So far, this structure is interpreted to extend over (around) 26km of strike and is confirmed to be highly prospective for nickel, copper and platinum group elements (PGE).

First mover Chalice started a systematic greenfields exploration program over the Gonneville intrusion in mid-2019.

The initial drilling began in the first quarter of 2020 and resulted in the discovery of shallow high grade PGE-nickel-copper-cobalt mineralisation, with the first drill hole (JRC001) intersecting 19m at 8.4 grams per tonne palladium, 1.1 grams per tonne platinum, 2.6 per cent nickel, 1 per cent copper and 0.14 per cent cobalt from 48m.

According to the company, the Gonneville discovery defined the new West Yilgarn nickel-copper-PGE province, with the intrusion being interpreted to be a layered mafic-ultramafic sill with a moderate westerly dip and gentle northerly plunge.

The potential feeder for the system, a highly prospective area for high grade
mineralisation, is yet to be discovered.

However, PGE-nickel-copper-cobalt plus-minus gold sulphide mineralisation was widespread throughout the intrusion and has been intersected down to around 850m below surface. The intrusion is open to the north in the Julimar State Forest and its depth extent remains unknown.

Speaking during the first day of the RIU Explorers Conference in Fremantle, Chalice managing director Alex Dorsch said the company had yet to find the limits of the ore body, with the search so far being confined to the southern end of the tenements.

“One of the challenges we’ve got is that thing just keeps getting bigger and bigger,” he told delegates.

“We had the benefit in September of being able to fly airborne EM over the discovery, as well as over all of other untouched area to the north, and you can see there we have this Hartog EM anomaly that extends over about 6.5km, which has yet to have a drill hole in it.

“So you can see (with this) sort of scale that we are really in the top echelon of minerals potential here.”

Earlier in the day Chalice had told the market it had just completed some initial metallurgical testwork which had shown the deposit had high palladium-nickel-copper recoveries which could yield commercially attractive base metal concentrates using simple flotation techniques.

This, Dorsch said, augured well for Chalice becoming a major player in the critical metals sector, with the electric vehicle market being “very dependent on class one nickel-cobalt-cobalt”, while hybrids “are very much dependent on palladium”.

“What’s most interesting to know about PGEs, and what is just emerging at the moment in the market, is really the criticality of these metals if we move to the hydrogen economy.

“So producing, purifying and then ultimately converting hydrogen into electricity through a fuel cell requires lots of PGEs.

“(And) at the moment the vast majority of PGEs come out of Russia and South Africa so there is obviously a big push, and that makes our discovery even more special being in a Western country.”

Although Chalice’s plan was now to have a maiden mineral resource in place for Gonneville by mid- 2021, this was not – according to Dorsch – “the end of the story”.


De Grey Mining Metallurgic Testwork Confirms High Recoveries

THE DRILL SERGEANT: De Grey Mining (ASX: DEG) reported results from a metallurgical testwork program undertaken at the company’s Hemi and regional deposits, south of Port Hedland in Western Australia.

De Grey Mining is conducting a comprehensive metallurgical testwork program across each of the mineralised zones at Hemi (Brolga, Aquila, Crow and Falcon) and the regional deposits of Mallina and Withnell.

The other main regional deposits of Toweranna and Wingina are free milling and will be able to be treated through a conventional CIL circuit.

Gravity testwork on three composite samples from Brolga achieved gold recoveries of 12.4 per cent, 27.3 per cent and 12.1 per cent as gravity testwork continues on samples from Aquila, Crow and Falcon.

Overall gold recoveries of 95 per cent have been achieved on samples from Brolga using a flowsheet combining gravity, flotation/oxidation and CIL in initial testwork to date.

“The results from our ongoing metallurgical testwork program continue to give us confidence in the multiple pathways we have to achieve high gold recoveries from Hemi and the regional deposits at Mallina,” De Grey Mining managing director Glenn Jardine said in the company’s ASX announcement.

“Each of the potential oxidation processes delivered high recoveries, with POX and Albion® the standouts respectively at 97 per cent and 98 per cent.

“Further testwork and trade off studies underway will enable us to optimise the various aspects of our metallurgical program in terms of capital, operating costs, recoveries and operability.”








Ardiden Reports on Pickle Lake Progress

THE DRILL SERGEANT: Ardiden Limited (ASX: ADV) brought the market up to speed on progress of Winter exploration activities at the company’s Pickle Lake gold project in north-west Ontario, Canada.

Ardiden is currently drilling four holes into the Winter programme at South Limb, which is situated immediately along strike of the Dona Lake Gold mine of Newmont.

Preparation is also underway for drilling over the frozen lake section of the Kasagiminnis gold deposit, 17km south-west of South Limb.

“Ground exploration activities at Pickle Lake are running smoothly and some exciting sulphides have been intersected in our South Limb drilling next to the Dona Lake Mine,” Ardiden managing director and CEO Rob Longley said in the company’s ASX announcement.

“We are on schedule to complete the initial drilling at South Limb and then move across to drill at Kas.

“It is great to see processed imagery from the drone mag survey over the frozen lake at Kas, help map out the highly prospective Iron Formation.

“Our site geologists are unravelling the structural and lithological controls on gold mineralisation at South Limb and Kas, as we collect more oriented data from these previously untested areas.”

Elsewhere in Ontario, Ardiden holds 100 per cent-ownership of three high-grade, hard-rock (spodumene) lithium projects.

The company has drilled over 25,000m on its lithium projects where it continues to hold exploration credits.

Ardiden is now undertaking a review of its Lithium assets at a time of rapidly growing lithium demand in the context of increasing focus on electric vehicles, energy storage and renewable energy generation.








Horizon Gold Updates Gum Creek Minerals Resource Estimate

THE DRILL SERGEANT: Horizon Gold (ASX: HRN) reported an updated Mineral Resource Estimate (MRE) for the Swan and Swift deposits located within the company’s 100 per cent-owned Gum Creek gold project, located in the Murchison Region of Western Australia.

The updated MRE for the Swan and Swift open cut deposits now stands at:

4.16 million tonnes at 2.41 grams per tonne gold for 323,000 ounces contained gold.

The MRE for the Swan and Swift underground deposits is:

0.7 million tonnes at 6.71g/t gold for 150,000 ounces contained gold.

The revised Total Mineral Resource for the Gum Creek project is:

18.59 million tonnes at 2.28g/t gold for 1.36 million ounces contained gold.

Horizon Gold explained the updated MRE represents a 26 per cent increase in global Indicated resources and a less than 2 per cent decrease in contained gold (26,900oz) when compared with Mineral Resources the company reported in July 2019.