Kaiser Reef Limited (ASX: KAU) — Maldon Mill Doubles Throughput and Union Hill Decline Refurbishment Underway
- Noel Ong
- 2 days ago
- 11 min read
The mill in Victoria has just doubled its run-time, the Union Hill decline is being opened up after years of stillness, and a string of fresh exploration targets is queuing up for the drill bit.
Samso News | ASX: KAU | Gold | Maldon Gold Project
Kaiser Reef Limited (ASX: KAU) has accelerated operations this month across its Maldon Gold Project in Victoria.
As of 1 May 2026, the Porcupine Flat Processing Plant has transitioned to a two-shift operation, enhancing its processing capacity. On 18 May 2026, the company announced the commencement of underground refurbishment at the Union Hill Decline, signalling a significant step in the project's development.
In conjunction with the refurbishment efforts, the company is preparing several exploration targets within the Maldon Gold Project, aiming to expand its resource base and improve overall project viability.
Table 1: Summary of May 2026 activities
Samso Summary | Details |
Company | Kaiser Reef Limited |
ASX Code | KAU |
Primary Assets | Henty Gold Mine, Tasmania; Maldon Gold Project, Victoria |
Main Story | Maldon processing has moved to two shifts and Union Hill decline refurbishment is underway |
Operating Platform | March quarter production of 5,534oz gold across Henty and Maldon; closing cash of A$45.6M |
Maldon Processing | Porcupine Flat now processing day and night shift, Monday to Thursday |
Union Hill Stockpile | 566kt @ 0.48g/t for 8,649oz Au; supports processing to 2030 at 10,000t/month |
Key Exploration Work | Union Hill underground drill platform, Quill, Maldon North and Nuggetty South |
The Core Development Point
The processing update is the clearest operational change. Kaiser reported that Porcupine Flat (Figure 1) is now operating on day and night shifts Monday through Thursday. The company stated that this has doubled plant throughput for a limited increase in personnel and costs.
In that setting, throughput and processing cost per tonne become central to project management. Kaiser stated that the shift change is expected to reduce processing cost per tonne because capacity has increased without a significant rise in fixed costs or overheads.
The Union Hill Stockpile remains an important part of the processing schedule. Kaiser stated that the stockpile supports continued processing until 2030 at 10,000 tonnes per month. Small-scale ore purchases are also ongoing, giving the plant additional feed flexibility while the underground and exploration programs are advanced.
Porcupine Flat Processing Plant: The Practical Base of the Maldon Strategy
The Porcupine Flat Processing Plant is central to the Maldon update because it gives Kaiser an operating processing asset at the project. The move to two shifts is a practical improvement rather than a conceptual change. The plant is now operating across day and night shifts from Monday to Thursday, with the stated result being doubled throughput.
The company has framed this as an important change because the additional throughput has been achieved with limited additional personnel and costs. For a processing plant that is handling a large component of low-grade stockpile feed, this is a key operating point.
The plant does not need to wait for a discovery before contributing to the project strategy. It can process available material while the company works on underground access and target generation.
The release also notes that small-scale ore purchases are ongoing. This is not the main story, but it adds another practical layer to the processing model. It suggests that Porcupine Flat can operate with a mix of Union Hill stockpile material and external parcels while Kaiser continues to assess the broader Maldon opportunity.
Management Commentary
"Maldon is a fully permitted operation in the heart of Victoria's Golden Triangle, including the Porcupine Flat Processing Plant, which is pouring gold, and the Union Hill Underground Mine, where we are both reclaiming and trucking low-grade stockpile material and finalising preparations for decline refurbishment."
"The change to two shifts at Maldon will significantly reduce our processing cost per tonne, as we have doubled capacity without significantly increasing our fixed costs or overheads. This is a material change, especially given that the bulk of the mill feed is from low-grade stockpiles. We expect Maldon to be near self-funding, including for exploration, moving forward, "
— Brad Valiukas, Managing Director, Kaiser Reef Limited (1 May 2026)
Union Hill: Refurbishment Re-establishes Underground Access
Kaiser announced that the refurbishment of the Union Hill decline has begun (Figure 2). The initial phase includes establishing a new northern access drilling platform about 250 metres down the decline, targeting untested sections of the Eaglehawk and Ladies Reefs.
This is a meaningful step for the project because underground access can improve the way the company tests the reef system. The release states that the Union Hill underground sits between and parallel to multiple lines of lode. The planned platform is designed to give Kaiser a position from which it can test areas that have not yet been drilled from that access point.
Figure 2: Jumbo in decline - Union Hill decline refurbishment work underway. (Source: Kaiser Reef ASX announcement dated 18 May 2026)
The refurbishment work also includes stripping sections of the decline where needed to establish a full-sized profile for life-of-mine haulage. That detail is important because it shows the work is not only about exploration access (Figure 3). It is also about preparing the underground infrastructure to support future operational use, subject to the results of ongoing work.
Management Commentary
"It's exciting to be back working underground at Maldon, and it's another milestone for Kaiser Reef. The Union Hill underground, with its existing footprint and positioning between and parallel to multiple lines of lode, is a key asset that will let us advance Maldon, both for exploration and production."
— Brad Valiukas, Managing Director, Kaiser Reef Limited (18 May 2026)
Figure 3: Union Hill North proposed drilling platform targeting untested sections of the Eaglehawk and Ladies Reefs. (Source: Kaiser Reef ASX announcement dated 18 May 2026)
Quill: A New Target Generated
The Quill target is one of the more interesting exploration components because it came from work associated with the proposed TSF 4 location (Figure 4). Kaiser reported that its recently completed 1,090 metre aircore program produced an anomalous intersection through in-situ material in drillhole TSAC_021. Follow-up one-metre samples upgraded the intersection to 8 metres at 4.16 g/t gold from 10 metres, including 2 metres at 9.90 g/t gold from 11 metres.
Kaiser also completed a reconnaissance electrical resistivity tomography survey over the area. The survey highlighted a high-resistivity zone running broadly north-south, coincident with the TSAC_021 intersection. Kaiser interpreted this as a potential quartz reef target, with follow-up RC drilling planned.
This remains an early-stage target. The significance is that the company now has a specific geophysical and geochemical target beneath a reported mineralised intersection. The next test is whether follow-up drilling can confirm continuity, geometry and grade beyond the initial aircore result.
Figure 4: Quill target and TSAC_021 location. (Source: Kaiser Reef ASX announcement dated 18 May 2026)
Maldon North: Soil Survey Results Build the District-Scale Picture
Kaiser also reported results from the phase one Maldon North soil sampling program. The survey was completed on a 160 metre by 80 metre grid and covered about 2.7 square kilometres of prospective tenure that had no previous surface sampling information available (Figure 5).
The program identified several areas of geochemical anomalism around the northern part of MIN5146. Kaiser highlighted an 850 metre north-northwest gold trend west of the Cumberland Line of mineralisation, as well as anomalism around the Sailors and Mosquito Reefs.
Figure 5: Maldon North soil sample locations with gridded gold percentile results and mapped quartz veins. (Source: Kaiser Reef ASX announcement dated 18 May 2026)
The company stated that the survey re-highlighted gold anomalism and mineralisation across multiple lodes over the full 4.4 kilometre strike within the tenement package (Figure 6). A phase two infill survey on 40 metre by 40 metre spacing is underway in areas of anomalous gold.
From a project assessment perspective, Maldon North is still at the target-generation stage. The value of the work is that it provides a more systematic surface dataset in an area that previously lacked that coverage. The infill program should help determine which anomalies are strong enough to move toward drilling.
Figure 6: Gridded soil sample percentile results across the Maldon Gold Project. (Source: Kaiser Reef ASX announcement dated 18 May 2026)
Nuggetty South: Permitted Drilling on a Defined Gap
Nuggetty South (Figure 7) provides a different kind of exploration target. Kaiser stated that drill planning is finalised, approvals are in place and a drilling contractor has been appointed. Drilling is scheduled to commence in late June.
The target is based on a newly interpreted shallow plunge south of the Nuggetty, or Tarrengower, Shaft. Kaiser noted historical drilling results including 3.4 metres at 34.0 g/t gold, including 0.35 metres at 187.5 g/t gold in DDH_57W1, and 4.3 metres at 11.2 g/t gold in DDH005.
The planned drilling will test an identified gap of approximately 170 metres of strike between known mineralisation along the interpreted plunge. Kaiser also noted that the Nuggetty Reef has estimated historical production of 301,000 ounces at approximately 187 g/t gold. The immediate question for investors is whether the untested gap can return results that support the interpreted plunge model.
Figure 7: Nuggetty long section showing the 170m untested area between successful drilling. (Source: Kaiser Reef ASX announcement dated 18 May 2026)
Near-Term Milestones to Watch
The following near-term milestones have been disclosed in the two source releases:
Table 2: Near Milestones
Activity | Timing | Status/Source |
Porcupine Flat 2-shift processing (day and night, Mon–Thu) | Commenced | Confirmed in 1 May 2026 release. Underpinned by Union Hill Stockpile until 2030 at ~10,000 t/month. |
Union Hill decline refurbishment | Underway | Confirmed in 18 May 2026 release. Includes establishment of a new northern drill platform ~250m down decline and stripping for full-sized life-of-mine haulage profile. |
Underground drilling from new Union Hill North platform (Eaglehawk and Ladies Reefs) | Next quarter | Scheduled in line with the published Strategic Plan for the Maldon Gold Project (18 May 2026 release). |
Nuggetty South diamond drilling (170m untested strike) | Late June 2026 | Permitting complete; diamond drill contractor appointed (18 May 2026 release). |
RC follow-up drilling at Quill Target | Planned | To test interpreted quartz reef along N–S resistivity high coincident with TSAC_021 intersection (18 May 2026 release). |
Maldon North soil sampling — Phase 2 infill (40m x 40m) | Underway | Following Phase 1 results across 2.7 km² of MIN5146 (18 May 2026 release). |
Concluding Samso Comments
The kaiser story is one that I have like for a long time. The gold sector has had the limelight for the last couple of years and it is not cooling off in terms of the "hype". I have described that the deal that Kaiser Reeek Limited got to acquire the Henty Gold Mine as a deal of the century, but as Brad Valiukas has discussed with me in his last Coffee with Samso (see below), the Maldon project is a value creating asset as well.
In the wiser period of my life through multiple periods of learnings, I am now seeing with clear glasess that assets in the mining sector often appear to be boring and unassuming. In my simpleton thinking, the first thought of Maldon was not one of bells and whistles. Since talking to Brad and my recent understanding of the Victorian gold fields, I am now thinking clearer and seeing the upside, no matter how awkward is the project, namely being underneath a populated town.
Our recent coverage of Black Horse Mining Limited is point in case. Readers should take some time and read throught the Samso insight we wrote below.
The key aspect of the Maldon story is that you have someone that is a practitioner of making mines work. Patience is obviously a key component for Maldon, hence, you need a company that is self funding, which Kaiser Reef Limited is, because patience is a direct correlation to the size of your wallet. Developing Maldon is going tot ake time and a lot of money, so this is why my thoughts are very comfortable with someone liek Kaiser Reef Limited to create the opportunity and the ability to see through the potential.
As always, time will tell and Samso is well aware that anything can happen with a mining project. Having being in the industry for over three decades, I have seen many scenarios, predicted and not.
About Kaiser Reef Limited
Kaiser Reef Limited (ASX: KAU) is an Australian gold producer and exploration company with operating assets in Tasmania and Victoria. The company presents itself as a multi-asset gold producer with a growing production base, supported by annual production of more than 30,000 ounces from the Henty Gold Mine and a high-grade Maldon Gold Project with a fully operational 200ktpa processing plant.
In Tasmania, Kaiser owns and operates the Henty Gold Mine, an established underground gold operation with a processing facility and associated exploration tenure. Henty has become a key production asset for the company and provides Kaiser with operating exposure to the Australian gold sector.
In Victoria, Kaiser is advancing the Maldon Gold Project, located in the historic Victorian goldfields. Maldon includes the Porcupine Flat Processing Plant and the Union Hill underground mine area. The project has a long mining history and is reported by Kaiser to have produced approximately 1.75 million ounces of gold at 28g/t from quartz reefs.
Kaiser’s stated focus is on production growth, reserve expansion and building value from its Australian gold asset base. The company’s project portfolio gives it exposure to both current gold production and exploration upside across two established mining jurisdictions. Its published core values are integrity, respect, responsibility and performance.
Previous Samso Coverage
Samso has followed the Kaiser Reef Limited story across multiple ASX releases. The following represents our prior published coverage of the company:
April 01, 2026
February 25, 2026 |
December 17, 2025
November 21, 2025
November 07, 2025
October 14, 2025
May 31, 2025
May 22, 2025
April 27, 2025
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