Kaiser Reef (ASX: KAU) Breaks New Ground at Union Hill as Maldon Moves Back Underground
- Noel Ong
- Aug 13
- 8 min read
Updated: Aug 18
The first new underground development at Maldon in almost eight years moves Kaiser Reef beyond refurbishment and gives the company a platform to test several of the historic goldfield’s largely untested reef positions.
Kaiser Reef Limited (ASX: KAU) has kicked off new underground development at the Union Hill Gold Mine within its Maldon Gold Project in Victoria, taking the first cut of the Northern Drill Drive and marking the first new development at the site in almost eight years.
The development is significant because it is not being undertaken simply to rehabilitate old workings. It is designed to establish an underground drill position capable of testing areas north of the existing Union Hill workings, including extensions of the Eaglehawk and Linscott's Reefs and the parallel Ladies and Sailor's Reefs.
For Kaiser, the milestone moves Maldon from refurbishment into active underground development and provides a clearer pathway towards determining whether the historic goldfield can deliver additional resources and, ultimately, support expanded production.
Figure 1: Jumbo at the face, Northern Drill Drive (Source KAU ASX Announcement)
The work also comes with some important context. Kaiser entered the September quarter with A$37.0 million in cash and A$0.2 million in bullion, having produced 6,000 ounces of gold across Henty and Maldon during the June quarter. The company has also reaffirmed production guidance of 32,000 ounces for the coming financial year from the two operations.
That balance sheet gives the Maldon program a different complexion from a typical junior exploration campaign. Kaiser is funding development and exploration from within an operating gold business rather than relying solely on the promise of future discoveries.
From Refurbishment to Development
During the June quarter, refurbishment of the existing Union Hill decline had already commenced. The initial program was focused on establishing a northern underground drilling platform while stripping sections of the decline where necessary to provide a full-sized profile suitable for future life-of-mine haulage.
The first development cut now takes that work a step further.
Kaiser is no longer simply reopening access to historic workings. The company is creating new underground infrastructure specifically intended to improve its ability to test the geological system around Union Hill.
The plan accompanying the August announcement shows the proposed drill position relative to the Eaglehawk, Linscott's, Ladies and Sailor's reef corridors, with substantial portions of those interpreted mineralised trends remaining untested (Figure 2)
Figure 2: Union Hill North with proposed development and drill position to target untested sections of the Eaglehawk, Linscott’s, Ladies and Sailor’s Reefs (Source: KAU ASX Announcement)
That is the central point of the announcement.
Maldon has a long mining history, but Kaiser is attempting to use modern exploration from underground positions that can provide better access to parts of the system that have received relatively limited modern drilling.
Managing Director Brad Valiukas described Maldon as a district-scale opportunity, noting that the field has historically produced approximately 1.75 million ounces of gold at 28g/t, despite numerous mines and lines of working remaining substantially underexplored.
Figure 3: Maldon Gold Project (Source: KAU ASX Announcement)
“Crucially, Maldon offers more than just historical pedigree and exploration upside. It is supported by a fully permitted and operating processing plant, a fully permitted mining lease and an existing decline that will allow both access for exploration and potential future production," said Valiukas
Historical production alone does not establish the scale of what remains, but it provides the geological rationale for testing the extensions of these old reef systems more systematically.
Underground Drilling Adds Another Dimension
The Northern Drill Drive forms part of a broader exploration effort already underway across Maldon.
Kaiser had approximately 4,350 metres of initial surface drilling planned at the end of the June quarter, with drilling expected to continue through the remainder of 2026. The first-round program includes Union Hill North, Nuggetty South, Nuggetty and additional targets being generated from mapping, soil sampling and planned geophysical work.
Figure 4: Nuggetty Long Section showing 170m untested area in between successful drilling. (Source: KAU ASX Announcement)
At Union Hill North, surface drilling is already intended to test the northern extensions of Eaglehawk Reef mineralisation ahead of, and beyond, the planned underground program.
The new underground platform should therefore complement rather than replace the surface campaign.
From an exploration perspective, the advantage is access. Underground drilling allows Kaiser to position the drill closer to the structures it wants to test and potentially drill reef orientations and extensions that may be difficult or inefficient to investigate from surface.
That becomes particularly relevant in a mature goldfield where the obvious near-surface mineralisation has already attracted more than a century of mining attention.
Existing Infrastructure Changes the Maldon Equation
Another important part of the Maldon story is the infrastructure that already exists around the exploration opportunity.
Kaiser describes Maldon as having a fully permitted and operating 200ktpa CIL processing facility, existing underground access and high-grade exploration potential. The company also holds the infrastructure and permits required to continue advancing the project within Victoria's historic Golden Triangle.
Valiukas stated: “It’s a milestone for both the Maldon Gold Project and Kaiser to have jumbo development underway beneath Union Hill, establishing this new drill platform for exploration. We have been stripping some narrow sections at the top of the decline already, with a view to future haulage, but it’s good to now be taking cuts and breaking new ground at the Union Hill Gold Mine."
This does not remove the need to demonstrate economic mineralisation.
It does, however, mean that Kaiser is not starting with an isolated discovery requiring an entirely new mine, processing plant and access network.
The company is simultaneously preparing sections of the Union Hill decline for potential future haulage while using that same underground access to establish exploration drill positions. Kaiser has said underground drilling forms part of its strategy to both define resources and clear the way for the next stage of development.
That dual-purpose investment is worth noting.
If drilling does not deliver sufficient mineralisation, the project still faces the usual exploration risk. If drilling is successful, however, some of the physical infrastructure required to advance the project is already being put in place.
A Producing Business Funding Growth
The June quarterly also provides useful perspective on Kaiser's ability to continue spending at Maldon.
The company produced 5,563 ounces from Henty and 437 ounces from Maldon, for total quarterly production of 6,000 ounces, while closing the period with A$37.2 million in cash and bullion.
“Kaiser is a profitable gold miner with a robust balance sheet and a strong pipeline of exploration and development opportunities. We are well-positioned to both capitalise on a strong gold price and add significant further value to our assets with targeted investment.”
Kaiser also continued to reinvest across the business.
During the quarter, the company spent approximately A$1.6 million on strategic land purchases at Maldon and A$1.4 million on Maldon exploration and set-up, alongside infrastructure investment at Henty, debt reduction and environmental bonding commitments.
That expenditure helps explain the importance of the latest announcement.
The Northern Drill Drive is the physical outcome of a broader program that has already been funded, commenced and progressively advanced. Rather than announcing an intention to eventually return underground at Maldon, Kaiser now has development equipment operating at the face.
What Comes Next
The next stage of the Maldon story will increasingly depend on what the drilling reveals.
The first development cut does not, by itself, add ounces to Kaiser's resource base, nor does it establish that the untested reef positions will ultimately support commercial mining.
It improves Kaiser's ability to answer those questions.
For investors, that shifts the focus from rehabilitation progress towards exploration results from areas that have been difficult to test effectively from surface.
Maldon's historical production of 1.75Moz at 28g/t provides the geological pedigree. The processing plant, underground access and permits provide infrastructure. Kaiser's producing Henty operation and cash position provide financial support.
The missing piece remains the geology.
With new development now underway beneath Union Hill, Kaiser is putting itself in a better position to determine how much of that historic gold system remains to be found.
Samso Concluding Comments
There is a tendency in the exploration market to wait for drill results because drill results give us the numbers everyone wants to analyse.
In this case, I think the more useful observation is what Kaiser is doing before those numbers arrive.
The June quarterly told us that the Union Hill decline was being refurbished. The latest announcement tells us that Kaiser has moved beyond refurbishment and started breaking new ground. That is a small distinction in wording, but a much larger distinction operationally.
The new development is being built to create access to parts of Eaglehawk, Linscott's, Ladies and Sailor's that remain poorly tested. At the same time, surface drilling is working across a broader collection of Maldon targets.
The attraction of the story is therefore not simply the historical 1.75Moz at 28g/t headline. History alone does not create a modern resource.
The more relevant question is whether modern exploration, using access that previous miners never had or never properly exploited, can demonstrate that meaningful high-grade gold remains around those old workings.
Kaiser now has an operating gold mine at Henty, cash on the balance sheet, processing infrastructure at Maldon and a development jumbo working underground at Union Hill. The next part of the story should increasingly become about what that investment discovers.
For investors, that is probably the part worth watching.
About Kaiser Reef Limited
Kaiser Reef Limited (ASX: KAU) is an Australian gold producer operating the Henty Gold Mine in Tasmania while advancing the Maldon Gold Project in Victoria.
Henty is supported by a 199koz Ore Reserve and a processing facility with capacity above 300ktpa.
Maldon provides the company's Victorian growth option through its existing underground access, permitted 200ktpa CIL processing plant and high-grade exploration potential.
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