Gold in the Yalgoo Mineral Field, the Mines, the Mills and the Companies
Four mines produce gold in Western Australia's Yalgoo Mineral Field, and two more projects have published studies. This Insight sets out the geology, the mining history, who owns each mine and mill on 11 October 2026, and the dates that come next.
The Yalgoo Mineral Field is one of the districts the Western Australian Government uses to administer mining titles. It covers a block of the Murchison region around the town of Yalgoo. Its gold projects run from Mt Gibson in the south to Western Queen in the north-east (Fig 1, in section 1.00). It was proclaimed as a goldfield in 1895 [R1].
Four mines in the field produce gold today. The Deflector gold mine and the Rothsay mine belong to Vault Minerals (ASX: VAU). Dalgaranga belongs to Ramelius Resources (ASX: RMS). Golden Grove, owned by 29Metals (ASX: 29M), is a copper and zinc mine that recovers gold as a by-product, which is a metal sold alongside the main product. Two more projects are each the subject of a Samso Research workup, which is Samso's long study of a single company. They are the Mt Gibson gold project, owned by Capricorn Metals (ASX: CMM), and the Western Queen gold project, owned by Rumble Resources (ASX: RTR).
This Insight is the Yalgoo page of Samso's Gold Regions Series. A mill is the plant that processes ore into gold. This page covers what the field is, the rocks that hold the gold, what was mined and when, who owns each mine and each mill on 11 October 2026, and the dates each company has given for what comes next.
All prices in this piece are as at the close of ASX trading on 16 October 2026. Global prices for gold are taken at the same time.
WHAT THIS PIECE COVERS 1.00 THE YALGOO MINERAL FIELD AND ITS BOUNDARY What a mineral field is, where this one is, and the map. 2.00 THE ROCKS THAT HOLD THE GOLD The geology in plain English, and the names companies use for it. What the State's geologists recorded, centre by centre. Mt Gibson, Dalgaranga, Golden Range, Western Queen and Deflector since the 1980s. Vault Minerals, Ramelius Resources and 29Metals. No Samso workup on these. 6.00 CAPRICORN METALS, MT GIBSON AND GOLDEN RANGE The Mt Gibson study, the approvals, and why Golden Range is separate. 7.00 RUMBLE RESOURCES AND WESTERN QUEEN The resource, the study, and why it does not yet meet Samso's near-term rule. Where ore is processed, and the restart timings for Kirkalocka. 9.00 THE GOLD PRICE AND INTEREST RATES The price in two currencies, the bank targets, Samso's view and the rate rises. Each company's stated timing, and the risks and limits. |
A NOTE ON THE VOCABULARY AND THE SOURCES Technical terms are explained where they first appear and are collected in a vocabulary box at the end. A marker such as [R1] points to the numbered source in the reference list. Where two sources give different figures for the same thing, both are quoted with their source and neither is preferred. Gold is measured in troy ounces. The tables shorten ounces to oz, thousand ounces to koz, million ounces to Moz, tonnes to t and million tonnes to Mt. Mt Gibson and Mount Gibson are the same place, and GSWA uses the longer spelling. |
READING THE SERIES Gold Regions Series, Release 1 Samso News. Gold price and the gold regions. Samso Insights. East Murchison. Samso Insights. Yalgoo Mineral Field. This page. Samso Research. Rox Resources (ASX: RXL), Youanmi. Samso Research. Horizon Gold (ASX: HRN), Gum Creek. Samso Research. Brightstar Resources (ASX: BTR), Sandstone, in three parts. Samso Research. Capricorn Metals (ASX: CMM), Mt Gibson. Samso Research. Rumble Resources (ASX: RTR), Western Queen. A page with no link is not yet published. That includes the Samso News piece, so this page carries no link back to it. |
The thumbnail for this piece uses a public domain photograph of a gold nugget [R48]
1.00 — THE YALGOO MINERAL FIELD AND ITS BOUNDARY
An administrative district of about 60,000 square kilometres
A mineral field is a district declared by the Western Australian Government for administering mining titles. The State is divided into these fields, and each has a number. The Yalgoo Mineral Field is number 59 [R2].
It began as the Yalgoo Goldfield. The proclamation was dated 23 January 1895 and was published in the Government Gazette on 8 February 1895 [R1]. A bulletin of the Geological Survey of Western Australia (GSWA), the State's geological agency, recorded that the goldfield “embraces an area of 23,230 square miles” and counted 19 mining centres on it [R3]. That area converts to about 60,200 square kilometres. The conversion is Samso arithmetic, and Samso has not checked whether the boundary has changed since the bulletin was written.
The name is the department's, and this Insight uses it. Company announcements more often say the Murchison or name a greenstone belt, and section 2.00 explains both terms.
Fig 1 is Samso's map of the field. It was compiled from the department's boundary file and from MINEDEX, the department's database of mines and mineral deposits, which lists 895 gold sites inside the boundary [R2]. The four mines that produce gold and the two workup projects are marked. Golden Range and the Kirkalocka mill are discussed later and are not marked on Fig 1. They appear on Fig 5 in section 6.00 and Fig 6 in section 8.00.
Western Queen is at the north-eastern edge of the field. The town of Mount Magnet, where Ramelius Resources has its mill, is outside the boundary to the east.
2.00 — THE ROCKS THAT HOLD THE GOLD
Greenstone belts, granite and the faults between them
The field is on the Yilgarn Craton. A craton is a piece of continental crust that has been stable for billions of years. GSWA places the Yalgoo area in the Youanmi Terrane, one of the large blocks that make up the craton [R4]. An older GSWA bulletin uses the name Murchison Province for this part of the craton [R5]. Investors usually say the Murchison.
The gold is in greenstone belts. A greenstone belt is a strip of old volcanic and sedimentary rock that has been folded and altered, with granite on either side. Fig 2 shows the pattern across the Murchison. The shaded strips are greenstone and the pale areas between them are granite and gneiss. Gneiss is a banded rock formed when granite and other rocks are deformed and recrystallised at depth.
The largest belt in the field is the Yalgoo-Singleton Greenstone Belt. A GSWA Record of 2020 describes it as “a ~190 km, north-northwest trending, arcuate-shaped greenstone belt” that is “primarily prospective for gold, in addition to base metals, W-Mo and iron ore” [R6]. Arcuate means curved. Base metals are copper, zinc and lead, and W-Mo is tungsten and molybdenum. Warriedar Resources, which owned Golden Range before Capricorn, gave the belt's length as about 120 kilometres [R7]. Both figures are quoted as published.
Companies use several other belt names. Bulletin 137 names the Gullewa, Dalgaranga, Warda Warra and Meekatharra-Wydgee belts among others [R5]. Deflector is in the Gullewa belt [R8]. Western Queen is in the Warda Warra belt and Kirkalocka is in the Meekatharra-Wydgee belt. These are local names for parts of the same geology, and a company may use any of them. Capricorn places Mt Gibson at the “southern extremity of the Retaliation Greenstone Belt, in the SW portion of the Yalgoo-Singleton Greenstone Belt in the Murchison Province” [R9].
Most of the gold is tied to shear zones. A shear zone is a band of rock that has been smeared out, and in places broken, by movement in the crust. Hot fluids carrying gold moved along these bands. Bulletin 137, published in 1990, put most of the province's gold deposits at about 2,650 to 2,600 million years old [R5]. Geologists call deposits of this kind orogenic gold.
The field also holds deposits of a second kind. Golden Grove is a volcanic-hosted massive sulphide deposit, or VHMS. It formed on or just below an ancient sea floor as a body of metal sulphides, which are minerals of metal and sulphur, and it is mined for copper and zinc. Capricorn's study says the main trend at Mt Gibson is “hypothesised” to have begun as a deposit of this type, rich in gold, copper and zinc, that was overprinted, meaning altered, by a later gold event [R9]. Weathering then left gold in laterite, the iron-rich crust at the surface [R5]. Deflector carries copper with its gold. Its former owner classed it as a “hybrid Archean orogenic gold-copper deposit” [R8].
The mix of deposit types affects how the ore is processed. Capricorn describes Mt Gibson ore as free-milling, meaning the gold can be recovered by grinding and by leaching, which dissolves the gold in a cyanide solution, with no treatment needed beforehand [R9]. Deflector produces both gold bars and a gold-copper concentrate, a metal-rich powder sold to a smelter, the works that extracts the metal [R8].
3.00 — MINING HISTORY TO 1987
Many small centres and a late arrival at Mt Gibson
GSWA's Bulletin 137 gives the “first authenticated discovery of economic gold mineralization” in the Murchison Province as Yuin, in 1890 [R5]. Yuin is one of the centres Samso places inside the Yalgoo field. GSWA's notes on the Yalgoo map sheet record that “Gold was discovered at Yalgoo in 1894” [R10].
The early mines were small. The same notes say that “by 1900 production from the Yalgoo field was only minor”, that there was “renewed activity at most centres in 1930”, and that “except for Bilberatha, production finally ceased in 1942” [R10]. Two centres in the south have their own GSWA bulletin. It records that gold was first found at Rothsay in 1894 by George Woodley and that the mine there “finally shut down in 1902”. At Paynes Find, the first gold “is reported to have been found by T. Payne in May, 1911” [R11].
Table 34 of Bulletin 137 lists recorded gold production for each mining centre in the Murchison Province to 31 December 1987 [R5]. The table is alphabetical and does not group centres by mineral field. Samso has picked out the 21 centres it places inside today's Yalgoo boundary, plus the row the Bulletin records against the Yalgoo Mineral Field with no centre named. Fig 3 charts them.
Those rows add to about 11,277 kilograms of gold, or about 362,600 ounces. The sum and the conversion are Samso arithmetic, at 32.15 ounces to the kilogram, and the choice of centres is Samso's. The Bulletin's total for the whole province is 227,564 kilograms. On that count the Yalgoo field produced about 5 per cent of the Murchison's recorded gold to 1987. The field was a small part of the Murchison's gold production before the modern mines.
Fig 4 is the Bulletin's map of where the province's gold came from. The large centres are Mount Magnet, Day Dawn, Meekatharra and Big Bell, and all four are outside the Yalgoo field.
At two centres, most of the gold came from one mine. The Bulletin says about 87 per cent of the Yalgoo centre's production came from the Emerald Reward mine, and about 90 per cent of production at Warda Warra came from the Western Queen mine [R5]. Western Queen is the project Rumble Resources owns today.
Mount Gibson's 2,447 kilograms came from 752,041 tonnes of ore, far more ore than any other centre in the field. The Bulletin explains that before 1986 the centre had only small-scale mining, at Tobias Find, Orion, Leakes Find and Paynes Crusoe. Mining of the laterite gold deposit began in 1986, and gold production from the rock beneath it began in 1988 [R5]. Most of that ore would therefore have been mined in 1986 and 1987. That is Samso's inference, because the Bulletin gives no split by year.
4.00 — THE MODERN MINES
Open pits from 1986, then closures and restarts
The laterite pits at Mt Gibson opened a period of larger mines. Table 1 lists them. The production figures are as each company published them and have not been reconciled with State records.
Grade is the amount of gold in each tonne of ore, measured in grams a tonne (g/t). Western Queen's 7.6 g/t is the highest grade in Table 1 [R12]. The Ore Reserve at Mt Gibson, the part of the deposit a study has shown can be mined at a profit, grades 1.0 g/t [R13]. Most of these mines stopped at least once. Golden Range went onto care and maintenance, meaning the plant was shut but kept in working order, three times [R7]. Dalgaranga produced 229,000 ounces between 1996 and 2000, restarted with a first gold pour in May 2018, and was suspended on 8 November 2022 [R14] [R15].
Ore was often trucked to a plant somewhere else. Rothsay ore has been hauled to the Deflector plant since June 2021 [R8]. Dalgaranga ore now goes to Mount Magnet. Rumble plans to truck Western Queen ore to another owner's mill. Section 8.00 covers the mills.
Table 1 also records a discrepancy. Capricorn's July 2026 study gives Mt Gibson's past production as 868,478 ounces in one place and 868,468 ounces in another [R9]. Both are quoted as published.
5.00 — WHO PRODUCES GOLD TODAY
Three owners, four mines and a takeover vote
Three companies produce gold in the field. Samso has not written a workup on any of them. Each is an established producer, and they are noted here from their latest reports. Table 2 at the end of this section sets them beside the two workup companies.
Vault Minerals, Deflector and Rothsay
Vault Minerals owns Deflector and Rothsay on the day of writing. It reports them together as the Deflector region. In the year to 30 June 2026 the region produced 77,649 ounces at an all-in sustaining cost of A$3,282 an ounce [R16]. All-in sustaining cost, or AISC, is the industry's measure of what it costs to produce an ounce at a working mine, including the spending needed to keep the mine going. It leaves out the cost of building the mine, interest and tax, and companies do not all calculate it the same way. Guidance is the company's forecast. For the year to June 2027 it is 74,000 to 78,000 ounces at A$4,300 to A$4,500 an ounce, which is higher than last year's cost. Vault says that figure includes a non-cash inventory charge [R16].
Rothsay is near the end of its reserve. An Ore Reserve is the part of a deposit that a study of at least pre-feasibility level has shown can be mined at a profit. Vault's July outlook “assumes production from Rothsay ceases in January 2028” [R16]. Its September reserve statement says Rothsay's reserve will be “substantially completed by the end of FY27”, which is June 2027 [R17]. Both are quoted as published. Rothsay's reserve at 30 June 2026 was 25,000 ounces, within a Mineral Resource of 258,000 ounces [R17]. A Mineral Resource is an estimate of the gold in the ground that has reasonable prospects of eventually being mined at a profit.
The owner may change. On 14 July 2026 Genesis Minerals (ASX: GMD) and Vault agreed to merge by a scheme of arrangement, a takeover that needs a shareholder vote and court approval. Vault shareholders would receive 0.7629 Genesis shares plus A$0.475 in cash for each Vault share. Vault had an earlier scheme with Regis Resources, which was terminated [R18]. The court has ordered the scheme meeting for 9.30am Perth time on Wednesday 11 November 2026 [R19]. The scheme booklet was registered on 6 October 2026 [R20]. If shareholders and the court approve, Deflector and Rothsay will belong to Genesis.
Ramelius Resources, Dalgaranga
Ramelius Resources has owned Dalgaranga since 31 July 2025, when its takeover of Spartan Resources was completed [R21]. The mine works the Never Never deposit from underground and from an open pit. In the June 2026 quarter the underground mined 115,000 tonnes at 5.95 g/t. The open pit ore, 79,000 tonnes at 2.10 g/t at the end of June, was stockpiled at site [R21]. Plate 1 shows the Never Never open pit.
Dalgaranga's own mill is on care and maintenance [R22]. Ore is trucked 70 kilometres to the Checkers mill at Mount Magnet, which is outside the Yalgoo field, and Ramelius reports Dalgaranga as part of its Mount Magnet operation [R23]. Dalgaranga's gold is therefore produced at a plant outside the field. Ramelius plans to move the main grinding mill and other parts of the Dalgaranga plant to Mount Magnet. The grinding mill is the machine that grinds the ore. The move is part of an expansion of the Mount Magnet plant to 4.3 million tonnes a year, which Ramelius targets for the March 2028 quarter [R22].
Dalgaranga's Ore Reserve at 30 June 2026 was 7.0 million tonnes at 7.2 g/t for 1.6 million ounces, within a Mineral Resource of 24 million tonnes at 4.0 g/t for 3.0 million ounces [R23]. Ramelius's update of 8 October 2026 gave group production of 48,839 ounces for the September quarter and said Dalgaranga was “ramping up tonnages”. It did not give Dalgaranga's ounces separately [R24].
29Metals, Golden Grove
The first Golden Grove deposit was found in 1971 and mining began in 1989 [R25]. It is a copper and zinc mine. Gold is a by-product, and 29Metals reports its costs per pound of copper [R26]. Gold production was 4,700 ounces in the June 2026 quarter and 1,100 ounces in the March quarter. Guidance for calendar 2026 is 6,000 to 14,000 ounces [R26].
Gold output at Golden Grove depends on the mine plan for copper and zinc. The June figure was higher because a stockpile of gold ore was processed [R26]. Plate 2 shows Gossan Valley, a new mining area where 29Metals expects first ore by the end of 2026 [R26].
In Table 2, Mtpa is million tonnes a year and FY26 is the year to 30 June 2026. The study stages named in the Status column are explained in sections 6.00 and 7.00, and toll milling is explained in section 7.00.
SAMSO TAKE Table 2 shows how the field is owned. Three of the four producing mines belong to companies whose larger operations are in other districts, and one of those companies is about to be voted on as a takeover target. The two projects with studies belong to a mid-sized producer and a small explorer. That is a common pattern in a mature gold district. The ground gets consolidated, ore gets trucked to whichever mill has room, and a small deposit depends on access to someone else's plant. When you look at a project in a district like this, do you ask who owns the nearest mill before you ask how many ounces are in the ground? |
6.00 — CAPRICORN METALS, MT GIBSON AND GOLDEN RANGE
A 3.67 million ounce reserve and a pending State approval
Capricorn Metals produces gold at Karlawinda, in the Pilbara [R13]. It plans its second mine at Mt Gibson, about 280 kilometres north-east of Perth [R9]. This series classes Capricorn as “Producer elsewhere. Mt Gibson is near-term”. Near-term has a set meaning in this series. A project meets Samso's near-term rule when it has a published pre-feasibility or definitive feasibility study and the company has stated a date for first gold.
Mt Gibson meets both parts. Capricorn published an updated pre-feasibility study, or PFS, on 27 July 2026 [R9]. A PFS is the middle of three study stages. It is firmer than a scoping study and less firm than the definitive feasibility study a lender usually wants. The study's timetable is construction and pre-production mining from the December quarter of 2026 and operations from the March quarter of 2028. Capricorn says both “are dependent on timing of final regulatory environmental approvals which are not within Capricorn's control” [R9].
Plate 3 shows a flooded pit at the project.
What the study says
The Mineral Resource at Mt Gibson is 188.9 million tonnes at 0.9 g/t for 5.67 million ounces. The Ore Reserve is 119.3 million tonnes at 1.0 g/t for 3.67 million ounces, and the resource includes the reserve [R13]. All of the reserve is in the Probable category, the lower of the two confidence levels for a reserve. It includes a first underground reserve of 365,000 ounces at 2.3 g/t [R9].
The plan is a plant designed for 5.0 million tonnes a year (Mtpa) of fresh rock, running for 19.25 years. The study mills 120.9 million tonnes over that life. It forecasts 3.51 million ounces recovered from 3.82 million ounces mined, a recovery of 92.1 per cent. The study says 96 per cent of that production is derived from Ore Reserves. In the underground part of the plan, 28 per cent of the ounces come from Inferred material [R9].
Production averages 182,500 ounces a year over the whole life, which includes fifteen months of processing low-grade stockpiles. It averages 260,900 ounces a year in years three to six, when the open pits and the underground run together. AISC is estimated at A$1,870 an ounce. Capital cost before production is A$474 million, made up of A$345 million for the plant and infrastructure and A$129 million for mining before production. The estimate carries no contingency, which is the allowance a study normally adds for costs not yet identified [R9]. These are the study's forecasts, modelled at a gold price of A$5,500 an ounce [R9].
Mt Gibson's reserve grades 1.0 g/t, so a large tonnage has to be treated for each ounce. The open pits mine 558 million tonnes of waste, a strip ratio of 5.0 tonnes of waste to each tonne of ore [R9]. In Samso's reading, that is why the plan is large.
Where the approvals stand
Capricorn's update of 5 October 2026 lists the position. Detailed engineering is complete. Federal environmental approval has been received. The State environmental review has been lodged and its public review phase has closed. Secondary State approvals have been lodged [R27]. The State decision had not been announced on the day of writing, and Capricorn has not announced a final investment decision, the board's formal commitment to build. Cash and gold on hand were A$535.0 million at 30 September 2026, a preliminary figure [R27]. The study's start date therefore depends on a State decision that has no date.
Golden Range is a separate project
Capricorn also owns Golden Range and Fields Find, north of Mt Gibson. They came with Warriedar Resources, which Capricorn agreed to buy in July 2025 [R28]. Fig 5 is Capricorn's map of the combined ground [R29].
Golden Range is outside the Mt Gibson PFS. The study states that it covers Stage 1 only. Stage 2 is a separate options study into “a second processing hub at the Golden Range Project located 65 - 100 kilometres north of the Mt Gibson processing site”, with preliminary results expected in the December quarter of 2026 [R9]. None of the Mt Gibson production, cost or capital figures above includes Golden Range.
Golden Range's resource is also reported separately. When Capricorn announced the acquisition it gave the resource as 1.38 million ounces of gold, with 60,000 tonnes of antimony in addition [R28]. More than half of those ounces were in the Inferred category, the lowest confidence level for a resource. That share is Samso arithmetic on Warriedar's table [R7]. The site has a 0.8 Mtpa plant that Capricorn describes as non-operating [R28]. Warriedar said it had been on care and maintenance since August 2019 [R7]. Fig 5 marks a haul route between the two projects. Capricorn has not published a study for Golden Range.
Samso Research has written a workup titled “Capricorn Metals Ltd (ASX: CMM)”, in three parts. It was not yet published on the day this Insight was written, so it is named here without a link. The figures in this section match the workup.
7.00 — RUMBLE RESOURCES AND WESTERN QUEEN
A scoping study, with a new one due this month
Rumble Resources owns 100 per cent of Western Queen, which is “approximately 90km Northwest of Mt Magnet” [R12]. This series classes Rumble as “Scoping study stage. Does not yet meet the near-term rule”.
Western Queen has a scoping study, the earliest and least certain of the three study stages. It has no pre-feasibility or definitive feasibility study, no Ore Reserve, and no firm date for first gold. Until those exist it does not meet Samso's near-term rule. The rule measures the study stage only and is no measure of the deposit.
The deposit
Western Queen was first worked in the 1930s [R12]. It was mined again from 1998 to 2002, in 2007, and in 2013 and 2014, the last time by Ramelius [R30]. Rumble gives past production as 880,000 tonnes at 7.6 g/t for 215,000 ounces [R12]. The Mineral Resource was upgraded on 24 June 2026 to 5.13 million tonnes at 2.6 g/t for 433,600 ounces. Of that, 227,700 ounces are in the Indicated category, the middle confidence level, and the rest are Inferred. The upgrade included a zone of 145,000 tonnes at 11.3 g/t beneath the old underground workings [R30]. The resource grades 2.6 g/t, against 7.6 g/t for past production.
The study
The scoping study of 27 November 2025 covers an underground mine at Western Queen South only. Its production target, the tonnage the study plans to mine, is 617,000 tonnes at 2.95 g/t for 58,500 ounces of contained gold, which is gold in the ore before any is lost in processing. The study estimates less than A$10 million of capital before development and an AISC of A$2,970 an ounce, at a gold price of A$5,540 an ounce. It assumes 94 per cent of the gold is recovered, a figure taken from earlier owners' processing, and A$100 a tonne for trucking and milling combined [R12]. The study predates the toll milling agreement. It plans to mine 58,500 ounces from a resource that now holds 433,600 ounces.
Rumble has released testwork of its own since the study, in an announcement dated 25 March 2026. The sample was 466 kilograms of material mined in the past at Western Queen South, which carries tungsten as well as gold. A bulk test on part of that sample projected overall gold recovery of about 92 per cent with a tungsten concentrate also produced. Baseline tests with no tungsten recovery, using gravity separation and then a cyanide leach, which dissolves the gold, extracted 95.4 per cent of the gold at a fine grind of 75 microns and 88.7 per cent at a coarser grind of 145 microns [R31]. A micron is a thousandth of a millimetre. Rumble's Diggers and Dealers presentation of 4 August 2026 still gave 94 per cent for the study [R32].
A scoping study is a low-accuracy study. It cannot support an Ore Reserve, and there is no certainty that its production target will be realised. The study states that 34 per cent of the production target is Inferred material, and that “there is a low level of geological confidence associated with Inferred Mineral Resources” [R12].
That study predates the June 2026 resource. Rumble is updating it. On 6 October 2026 the company said the work was “slightly delayed” and that it was “Now aiming to release the Study during October” [R33]. It had not been released on the day of writing. The same update says a feasibility study and a decision to mine are “still targeting the December quarter 2026”, and that a State approval called the Mine Development and Closure Proposal “remains the key outstanding approval” [R33].
Rumble has given a conditional year for first gold, calendar 2027, and no quarter. The Annual Report says that if its remaining steps are achieved in a timely manner the company should be “producing gold in calendar year 2027” [R34]. The steps it lists include final approvals, working capital, a mining contractor and a final investment decision. The Annual Report also carries a going concern note, which says the company depends on raising capital. Cash was A$11.1 million at 30 June 2026 [R34].
Western Queen has no plant. Rumble plans to truck ore to the Kirkalocka mill under a toll milling agreement, a contract to have ore processed at another owner's plant for a fee. The Kirkalocka mill is not running, and section 8.00 sets out the restart dates given so far.
Samso Research has written a workup titled “Rumble Resources Limited (ASX: RTR)”, in two parts. It was not yet published on the day this Insight was written, so it is named here without a link. The figures in this section match the workup. Samso also published five earlier pieces on Rumble and Western Queen between March and December 2025.
8.00 — THE MILLS
Five mills near Western Queen, and the Kirkalocka restart
A gold deposit needs a processing plant, usually called a mill, to turn ore into gold bars. The Mt Gibson study puts A$474 million into a new mine and plant [R9]. The Western Queen study plans no plant. It assumes the ore is treated at another owner's mill [R12]. Fig 6 is Rumble's map of the mills within reach of Western Queen.
Five mills are shown. Two belong to Ramelius. Checkers, at Mount Magnet, is running and takes Dalgaranga's ore. The Dalgaranga mill is on care and maintenance and its grinding mill is to be moved [R22]. Tuckabianna, further east, belongs to Westgold Resources [R12]. It is outside the Yalgoo field on Samso's map. The Golden Range mill belongs to Capricorn and is not operating [R28]. The fifth is Kirkalocka.
Fig 6 prints 1.9 Mtpa for Kirkalocka. The text of the same study says 2.0 Mtpa [R12], and so does the owner's website [R35]. Rumble's announcement of the toll milling agreement says 2.1 Mtpa [R36]. Each is quoted as published.
Kirkalocka
Kirkalocka belongs to Gylden Resources, a private company that says it is owned by an affiliate of Värde Partners [R35]. The plant is not running. Odyssey Gold (ASX: ODY) had a toll milling agreement there until 14 October 2026, when it told the ASX that the agreement had been terminated. Odyssey says the plant last operated in 2022 and has been on care and maintenance since [R37]. Gylden is refurbishing it. Plate 4 shows the plant.
Rumble announced its agreement with Gylden on 19 May 2026. It covers all forecast gold ore from Western Queen for four years and 11 months from the first ore processed, with fees fixed for calendar 2027. It has three conditions. Rumble must make a decision to mine, the two companies must sign a joint refining contract, and Ramelius must not have exercised its pre-emptive rights to process ore from Western Queen [R36]. The plant is about 180 kilometres from Western Queen [R38].
The parties have given different timings for the restart. Table 3 sets out each statement as its author gave it.
Table 3 holds two differences. Rumble's last dated statement was the second half of 2026, and the owner's website says mid Q1 2027, which is about February 2027. Rumble names Interquip Construction as the contractor and Odyssey names MACA Limited. Each is quoted with its source [R38] [R33] [R35] [R39].
The restart date decides when Western Queen ore can be processed. The November 2025 study said first ore could come “within six months of commencing decline development”, a decline being the sloping tunnel that gives access to an underground mine [R12]. Ore mined before the mill is running has to wait in a stockpile.
9.00 — THE GOLD PRICE AND INTEREST RATES
Gold is inside Samso's range and above both study prices
Gold mined in Australia is sold in Australian dollars, so the Australian dollar price is the one that applies to these mines and studies. The prices below are futures closes. A futures contract is an agreement to buy gold at a set price on a later date, and the nearest contract trades close to the spot price, the price for immediate delivery.
The price now
Gold closed at US$4,170 an ounce. At an exchange rate of 0.6978 US dollars to the Australian dollar, that is A$5,976 [R40]. The highest close of this cycle was US$5,318 on 29 January 2026, and A$7,581 on 28 January 2026. Gold is 21.6 per cent below that high in US dollars and 21.2 per cent below it in Australian dollars. Fig 7 shows both.
Over a year the gold price is lower in both currencies, and lower by more in Australian dollars. The US dollar price is 0.7 per cent lower than a year earlier, and the Australian dollar price is 7.7 per cent lower than a year earlier [R40]. The difference comes from the exchange rate. The Australian dollar has risen against the US dollar over the year, and a stronger Australian dollar lowers the local gold price. At today's levels a move of one US cent in the exchange rate changes the Australian dollar gold price by about A$84 an ounce. These comparisons are Samso arithmetic.
What the banks and the World Gold Council say
London Gold Exchange, a UK gold dealer directory, compiles the published gold targets of the large banks. Its list of 1 October 2026 has nine targets for late 2026, from US$4,450 at the low end to a range of US$4,900 to US$5,100 at the high end. All nine are above the price on 16 October 2026. Most also give a later figure, for 2027 or for the next 6 to 12 months, and those run from US$5,000 to a range of US$5,400 to US$5,600 [R41]. Fig 8 charts them with the date each was issued. A tenth bank on the list gives an average for 2026 and is left off the chart. Samso has read the compilation and has not read the bank notes behind it.
The World Gold Council, the industry's association, reported total gold demand of 1,269 tonnes in the June 2026 quarter, unchanged from a year earlier. Central banks bought 289 tonnes, up 62 per cent. Gold exchange-traded funds, which hold gold on behalf of share market investors, sold 45 tonnes. Jewellery demand fell 17 per cent to 278 tonnes [R42]. Central banks bought more gold, funds sold, jewellery buyers bought less, and total demand was unchanged.
What Samso has published
Samso's current view is in “The Big Consolidation” of 8 July 2026, which followed “The Gold Question” of 21 June 2026 [R43] [R44]. It gave a range of US$3,900 to US$4,500 for the second half of 2026, with a centre of US$4,100 to US$4,300. It put the chance of that range at about 55 per cent, a higher outcome at about 25 per cent and a lower one at about 20 per cent. It also set an objective of US$5,000 to US$5,500 over two years, tied to the US central bank changing course in 2027.
Since 8 July 2026 there have been 71 trading days. Gold closed inside US$3,900 to US$4,500 on 62 of them and above it on 9, all between 19 August and 3 September 2026. It has not closed below US$3,900. The close of US$4,170 is inside the centre of that range. Samso has not published a change to the view. At today's exchange rate the range is about A$5,589 to A$6,449. The count and the conversion are Samso arithmetic.
Interest rates
The US and Australian central banks have both raised rates. The US Federal Reserve lifted its target range on 16 September 2026 to 3.75 to 4.00 per cent, its first rise since July 2023, after three cuts late in 2025. Its statement said “Inflation remains elevated” [R45]. The Reserve Bank of Australia has raised its cash rate target, the rate it sets for overnight lending between banks, four times in 2026, from 3.60 per cent to 4.60 per cent. The latest rise was decided on 29 September 2026, and the statement referred to “increasing the cash rate target further if needed” [R46].
Higher rates work against gold through the real yield, which is the interest on a government bond after expected inflation. Gold pays no interest, so a higher real yield raises the cost of holding it. The US 10-year real yield was 1.89 per cent on the day of gold's highest close and is 2.78 per cent now [R47]. Fig 9 shows gold falling as the real yield rose.
What it means for the two projects
The Australian dollar price of A$5,976 is 8.7 per cent above the A$5,500 used in the Mt Gibson study and 7.9 per cent above the A$5,540 used in the Western Queen study. Both comparisons are Samso arithmetic. The Mt Gibson study estimates AISC at A$1,870 an ounce and the Western Queen study estimates A$2,970 [R9] [R12]. The Western Queen estimate is closer to the gold price than the Mt Gibson estimate. Both are study figures at different study stages, and AISC leaves out the capital to build, which is A$474 million before contingency at Mt Gibson. Higher interest rates also raise the cost of any debt used to build a mine. Rumble says potential lenders are waiting for its updated study [R33].
10.00 — WHAT TO WATCH
Dates from now to 2028
Table 4 lists the dates the companies have given. Each is the company's statement. Several depend on approvals or on other parties, and the companies say so.
When Rumble releases its updated study, the figures in section 7.00 will be replaced. Rumble's class in this series may change. The Vault vote on 11 November 2026 will decide who is named as the owner of Deflector and Rothsay. The State decision on Mt Gibson has no date and is not in the table.
THE RISKS AND THE LIMITS The record to 1987 is of small mines, about 5 per cent of the Murchison's gold from a district of 60,000 square kilometres. Most of the larger mines since then have stopped at least once. Vault's outlook assumes Rothsay stops producing in January 2028, and its cost guidance for the Deflector region rises from A$3,282 an ounce last year to A$4,300 to A$4,500 this year. Dalgaranga's gold is processed outside the field, so a 1.6 million ounce reserve feeds a plant elsewhere. The Deflector region's reserve, for comparison, is 170,000 ounces [R17]. The two projects with studies are not yet mines. Mt Gibson's reserve is all in the lower confidence category, the State approval is outstanding, the capital estimate has no contingency and there is no final investment decision. Golden Range is mostly Inferred and Capricorn has published no study for it. Western Queen has no reserve, a study in which a third of the target is Inferred, a going concern note in the Annual Report and a mill that is not running. Its resource grades 2.6 g/t against the 7.6 g/t of past production, and the restart dates given for Kirkalocka do not agree. The toll milling agreement still depends on a decision to mine, on a joint refining contract, and on Ramelius not using its pre-emptive right to process Western Queen ore. The study assumes 94 per cent of the gold is recovered, and Rumble's own testwork of March 2026 projected about 92 per cent when tungsten is also recovered. The updated study is late, and Rumble says potential lenders are waiting for it. Gold is more than a fifth below its January high, the Australian dollar price is 7.7 per cent lower than a year earlier, and both central banks have just raised rates. Gold funds sold 45 tonnes in the June quarter. Samso's July view gave a lower outcome about a one in five chance, and the bank targets come from a compilation, with the bank notes unread by Samso. |
SAMSO TAKE I read the Yalgoo field as a district where gold was found in many places, and the hard part was scale and processing. Mt Gibson's plan relies on size. Western Queen's relies on grade and on another owner's mill. Neither is built. The next few months put dates and numbers on both. If you had to choose which fact to learn first about either project, would it be the grade, the approval, or the day the mill turns on? |
THE VOCABULARY, IN PLAIN ENGLISH Mineral field A district declared by the Western Australian Government for administering mining titles. Craton A piece of continental crust that has been stable for billions of years. Greenstone belt A strip of old volcanic and sedimentary rock, folded and altered, with granite on either side. Most Western Australian gold is in greenstone belts. Shear zone A band of rock smeared out, and in places broken, by movement in the crust. Gold-bearing fluids often moved along shear zones. Orogenic gold Gold deposited from hot fluids along faults and shear zones while the crust was being deformed. VHMS Volcanic-hosted massive sulphide. A body of metal sulphides formed on or just below an ancient sea floor, usually mined for copper, zinc and lead. Laterite The iron-rich crust left at the surface by long weathering. It can hold secondary gold, moved and redeposited during weathering. Grade, g/t The amount of gold in ore, in grams for each tonne. Mineral Resource An estimate of the metal in the ground that has reasonable prospects of eventually being mined at a profit. Its confidence levels, lowest to highest, are Inferred, Indicated and Measured. Ore Reserve The part of a resource that a study of at least pre-feasibility level has shown can be mined at a profit. Its confidence levels are Probable and Proved. Inferred material cannot become a reserve. Scoping study, PFS, DFS The three stages of mine study, from least to most certain. PFS is a pre-feasibility study and DFS is a definitive feasibility study. Near-term rule Samso's rule for this series. A project is near-term when it has a published PFS or DFS and a stated date for first gold. AISC All-in sustaining cost. What it costs to produce an ounce at a working mine, including the spending needed to keep the mine going. It leaves out the cost of building the mine, interest and tax. Mill The plant that processes ore into gold. A grinding mill is the machine inside it that grinds the ore. Workup Samso Research's long study of a single company. Production target The tonnage and grade a study plans to mine. Mtpa Million tonnes a year, the usual measure of a mill's capacity. Free-milling Ore from which gold can be recovered by grinding and cyanide leaching with no treatment beforehand. Concentrate A powder rich in metal, produced at the mine and sold to a smelter. By-product A metal sold alongside a mine's main product. Care and maintenance A mine or plant that is shut but kept in working order. Toll milling Having ore processed at another owner's plant for a fee. Decline The sloping tunnel that gives access to an underground mine. Scheme of arrangement A takeover that needs a shareholder vote and court approval. Final investment decision A board's formal commitment to build a project. Futures contract An agreement to buy or sell gold at a set price on a later date. Real yield The interest on a government bond after expected inflation. Cash rate target The rate the Reserve Bank of Australia sets for overnight lending between banks. |
References and sources
Each source below has an identifier, and the same identifier appears in the text where the source is used. Figures 2 and 4 are reproduced from the Geological Survey of Western Australia. Figures 5 and 6 and Plates 1 to 4 are reproduced from company documents, each credited in its caption. Figure 1 and Figures 3, 7, 8 and 9 were drawn by Samso from the data named in their captions. ASX announcements link to the company's announcements page on the ASX website. GSWA publications are available from the department's online bookshop and carry no link here.
[R1] Government Gazette of Western Australia, No. 9, 8 February 1895. Proclamation of the Yalgoo Goldfield under the Goldfields Act 1886, dated 23 January 1895.
[R2] Department of Mines, Petroleum and Exploration, Western Australia. Mineral Field Boundaries (DMIRS-005) and MINEDEX (DMIRS-001) datasets, downloaded 5 October 2026. Map compiled by Samso.
[R3] Feldtmann, F.R., 1921. Geological Survey of Western Australia, Bulletin 81, on the Warriedar gold-mining centre of the Yalgoo Goldfield. Prefatory note dated 8 December 1918.
[R4] Zibra, I., Peternell, M., Schiller, M., Wingate, M.T.D., Lu, Y. and Clos, F., 2018. “Tectono-magmatic evolution of the Neoarchean Yalgoo Dome (Yilgarn Craton): diapirism in a pre-orogenic setting”. Geological Survey of Western Australia, Report 176.
[R5] Watkins, K.P. and Hickman, A.H., 1990. “Geological evolution and mineralization of the Murchison Province, Western Australia”. Geological Survey of Western Australia, Bulletin 137. Table 34, Figure 2, Figure 154 and the mining centre descriptions.
[R6] Price, J.J., Blenkinsop, T.G., Goodenough, K.M. and Kerr, A.C., 2020. “Stratigraphy, petrography and structure of Archaean rocks in the Rothsay mining area, western Yilgarn Craton”. Geological Survey of Western Australia, Record 2020/13.
[R7] Warriedar Resources Limited, 1 May 2025. “Ricciardo Delivers Australia's Largest Open-Pit Antimony Resource”. ASX announcement.
[R8] Silver Lake Resources Limited, 15 September 2021. “Mineral Resource and Ore Reserve Statement and Outlook to FY24”. ASX announcement.
[R9] Capricorn Metals Ltd, 27 July 2026. “Compelling Mt Gibson PFS Update, Production Ramp Up to 260,000 Ounces PA, Low Cost & 19 Year Mine Life”. ASX announcement. Link
[R10] Muhling, P.C. and Low, G.H., 1977. “Yalgoo, Western Australia”. Explanatory notes to the 1 to 250,000 geological map series, Sheet SH/50-2. Geological Survey of Western Australia and Bureau of Mineral Resources.
[R11] Clarke, E. de C., 1925. Geological Survey of Western Australia, Bulletin 86, on the gold mining centres of Rothesay and Goodingnow (Payne's Find), Yalgoo Goldfield.
[R12] Rumble Resources Limited, 27 November 2025. “Western Queen South Scoping Study Highlights Robust Underground Mining Project”. ASX announcement. Link
[R13] Capricorn Metals Ltd, 27 July 2026. “Capricorn Gold Reserves Increase to 5.2 Million Ounces Driving Strong Growth Outlook”. ASX announcement. Link
[R14] Gascoyne Resources Limited, 3 October 2019. “Dalgaranga Gold Mine – Updated Ore Reserve”. ASX announcement.
[R15] Spartan Resources Limited. Annual Report 2023.
[R16] Vault Minerals Limited, 29 July 2026. “June 2026 Quarterly Activities Report”. ASX announcement. Link
[R17] Vault Minerals Limited, 3 September 2026. “2026 Resource and Reserve Statement”. ASX announcement. Link
[R18] Genesis Minerals Limited and Vault Minerals Limited, 14 July 2026. “Genesis and Vault agree ~A$12.6bn merger to create a new Australian gold major”. ASX announcement. Link
[R19] Vault Minerals Limited, 5 October 2026. “Court Approves Convening of Scheme Meeting and Dispatch of Scheme Booklet”. ASX announcement. Link
[R20] Vault Minerals Limited, 6 October 2026. “Scheme Booklet Registered with ASIC”. ASX announcement. Link
[R21] Ramelius Resources Limited, 29 July 2026. “June 2026 Quarterly Activities Report”. ASX announcement. Link
[R22] Ramelius Resources Limited, 21 September 2026. “4-Year Outlook & FY27 Guidance”. ASX announcement. Link
[R23] Ramelius Resources Limited, 25 August 2026. “2026 Resources & Reserves Statement”. ASX announcement. Link
[R24] Ramelius Resources Limited, 8 October 2026. “September 2026 Quarter Update”. ASX announcement. Link
[R25] 29Metals Limited. Golden Grove operation page, company website, read October 2026. Link
[R26] 29Metals Limited, 15 July 2026. “June 2026 Quarterly Report”. ASX announcement. Link
[R27] Capricorn Metals Ltd, 5 October 2026. “KGP Q1 Production 31koz, KEP Completed on Schedule”. ASX announcement. Link
[R28] Capricorn Metals Ltd and Warriedar Resources Limited, 24 July 2025. “Capricorn Metals to Acquire Warriedar Resources”. ASX announcement. Link
[R29] Capricorn Metals Ltd, August 2026. Diggers & Dealers Mining Forum presentation. Slides 10 and 20. Link
[R30] Rumble Resources Limited, 24 June 2026. “Western Queen Gold Resources upgraded to 433koz with 228koz now in Indicated category and a new high-grade zone of 53koz @ 11.3g/t gold”. ASX announcement. Link
[R31] Rumble Resources Limited, 25 March 2026. “Excellent Metallurgical Results for Western Queen Gold and Tungsten Project”. ASX announcement. Link
[R32] Rumble Resources Limited, 4 August 2026. Diggers and Dealers Mining Forum Presentation. ASX announcement. Link
[R33] Rumble Resources Limited, 6 October 2026. Western Queen Mine Project Development Update. ASX announcement. Link
[R34] Rumble Resources Ltd, 30 September 2026. Annual Report for the year ended 30 June 2026. Link
[R35] Gylden Resources. Company website, About page and Kirkalocka Processing Plant page, read 11 October 2026. Link
[R36] Rumble Resources Limited, 19 May 2026. “Toll Milling and Blending Agreement for Western Queen gold ore executed with Gylden and Kirkalocka Gold”. ASX announcement. Link
[R37] Odyssey Gold Limited, 20 May 2026. “Kirkalocka Toll Milling Agreement Provides Near Term Processing Capacity for Tuckanarra Project”. ASX announcement. Link
[R38] Rumble Resources Limited, 24 August 2026. Western Queen Mine Project Development Update. ASX announcement. Link
[R39] Odyssey Gold Limited, 30 September 2026. “Update on Tuckanarra Gold Project”. ASX announcement. Link
[R40] Yahoo Finance. COMEX gold futures, nearest contract (GC=F), and the Australian dollar against the US dollar (AUDUSD=X), daily closes. Last bar complete at the ASX close of 16 October 2026. Australian dollar gold price is Samso arithmetic. Link
[R41] London Gold Exchange. Gold price outlook for 2026 and 2027, a compilation of published bank targets, updated 1 October 2026. Read 11 October 2026. Samso has not read the bank notes. Link
[R42] World Gold Council. Gold Demand Trends, Q2 2026, executive summary. Data as of 30 June 2026. Link
[R43] Samso Insights, 8 July 2026. “The Big Consolidation, Where the Gold Price Settles Before Its Next Move”. Link
[R44] Samso Insights, 21 June 2026. “The Gold Question, Which Way for the Gold Price From Here”. Link
[R45] Board of Governors of the Federal Reserve System, 16 September 2026. Federal Open Market Committee statement, and the Open Market Operations page for the history of the target range. Link
[R46] Reserve Bank of Australia, 29 September 2026. Statement by the Monetary Policy Board, and statistical table A2 for the history of the cash rate target. Link
[R47] US Department of the Treasury. Daily par real yield curve rates, 10-year. Link
[R48] Cover photo. Gold Nugget, National Museum of American History, Smithsonian Institution, image SIA-98-4800. CC0 1.0, Smithsonian Open Access. The nugget is from California and not from the Yalgoo Mineral Field. Link
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