Tambo: Photon analysis grades up to 51.5 g/t gold

ECR Minerals plc (LON: ECR), the exploration and development company focused on gold in Australia, is pleased to provide the first gold results from photon analysis of rock chips from the historic Duke of Cornwall Mine, Swifts Creek (Tambo), Eastern Victoria, Australia.

HIGHLIGHTS

• A selection of 37 rock chips from the Duke of Cornwall Lode have been analysed for gold using photon analysis.
• Best results include 51.5 g/t Au, 26.5 g/t Au and 24 g/t Au.
• A further 5 rock chips contain gold grades greater than 5 g/t Au.
• Total of 56 rock chips and 84 soil samples were taken across the broader strike of mineralisation with results from these additional samples due shortly.
• The Eastern Victorian exploration tenements offer a new area for gold and base metal exploration.

Recently completed exploration

ECR Minerals holds exploration tenement EL007484 in eastern Victoria, Australia. It has also applied for, but is awaiting final approval, for exploration licence EL007486 (in the same area). Situated approximately 500km east of ECR's Central Victorian projects (Creswick and Bailieston), the project area hosts distinct geology offering potential opportunities for gold and base metals.

There has been no significant exploration work completed on EL007484 since a site visit by ECR in 2023. Initial findings at that time included a significant rock chip sample of 0.2m @ 22 g/t Au from the Duke of Cornwall Mine. Elevated levels of pathfinder elements arsenic and bismuth alongside gold indicated the potential for further discoveries.

A recent exploration campaign included detailed mapping of historical gold workings and the collection of 56 rock chips and 84 soil samples taken at spaced intervals across and along strike of the mineralisation to gain a better understanding of the spread of pathfinder elements. Notably, historical mine development below 20m from surface remains unexplored.

With positive community and landowner relations the Board is confident that ECR is well positioned to make substantial progress on the project going forward.

Photon analysis

In response to recent challenges in obtaining laboratory results for gold through conventional fire assay methods, as previously announced, ECR has been trialling alternative approaches, including the use of photon analysis. PhotonAssay, described in more detail at the end of this announcement, is a novel, cost effective and non-destructive analytical technique, which can significantly reduce both sample preparation time and the duration of final analysis. This method has undergone testing by a number of mining companies and its consultants, in recent years, to understand its precision and the Directors understand it has been extensively used for grade control sampling at the Fosterville Goldmine (owned by Agnico-Eagle). Whilst it is still a new technique, the work done to date suggests that gold grade analysis does not necessarily need fire assay accuracy and that photon analysis can achieve the same results, particularly if grades mined are high and the sample size is large.

Out of the 56 rock chips, 37 have been analysed for their gold content using Photon analysis. The initial findings suggest encouraging indications of high-grade gold. Notably, eight samples have revealed gold concentrations exceeding 5 grams per tonne (g/t). Sample BTR056 was obtained from in-situ unmined vein material and has demonstrated an expected grade of up to 51.5 g/t Au. Sample BTR047, extracted from a vein previously sampled in 2023 where a fire assay indicated 0.2 meters at 22 g/t Au, yielded a photon analysis result consistent with expectations, measuring 24 g/t Au.

All 56 rock chips are now undergoing duplicate analysis for gold by way of fire assay, and the results of this analysis will be announced as soon as they are available. In addition, earlier findings from 2023 indicate the presence of the metal bismuth, with concentrations reaching up to 0.4 kilograms per tonne, alongside gold. Further work is underway to better understand the significance and implications of bismuth in these samples.

Table One: Rock chip results above 0.5g/t Gold from Latest Tambo Project Exploration

No other rock chip samples returned reportable results.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Figure One: Plan view of Duke of Cornwall Lode and Best Rock Chips.

Mike Whitlow Chief Operating Officer said: "Our technical strategy in Victoria continues to deliver promising results. We are observing significant variations in the geological age and footprint at our easternmost tenement, Tambo. Today's findings are particularly encouraging, as they are based on new scientific data analysis, further supporting the potential for drilling this asset in the second half of this year.''

Adam Jones Chief Geologist added: "The Eastern Adit has shown very encouraging high-grade results which merit further exploration. Although still early stage, our work done to date suggests these grades continue at greater depths below surface and beyond the shallow historical workings. These encouraging findings have pinpointed several high-priority drill targets which we will revisit in the coming months. What was also apparent during my visit is that large parts of the tenement are yet to be explored so there is considerable scope to follow up. It's worth considering what other sites have been overlooked since the early days of mining, especially in the current strong gold price environment.''

REVIEW OF ANNOUNCEMENT BY QUALIFIED PERSON

ABOUT PHOTON ASSAY

Developed by Australia's national science agency, CSIRO, photon assay is described as a technique that can deliver faster, safer, and more accurate gold analysis. The developers of PhotonAssay are positioning it as an environmentally-friendly replacement for fire assay that can provide rapid turnaround on high sample volumes. Samples can be processed in less than 2 minutes in an automated process, compared to 3-4 hours for fire assay samples. A number of companies have undertaken a thorough evaluation of the method on their projects by undertaking extensive testing against fire assays (currently considered the gold standard for grade determination) with excellent results. PhotonAssay is considered most suitable for coarse gold mineralisation where analysis of large sample sizes is advantageous.

The technique works by hitting samples with high-energy X-rays, which causes excitation of atomic nuclei allowing enhanced analysis of gold, silver, copper and other elements in as little as two minutes. A highly sensitive detector picks up the unique atomic signatures from these elements to determine concentrations.

PhotonAssay has the following features:

• Bulk measurement of large samples, typically 400-650 g
• Minimal sample preparation e.g. crush to 2-3 mm top-size
• Non-destructive; no chemical reagents required
• Rapid (< 2 mins per sample, 70 samples/hour)
• Excellent sensitivity (0.01 ppm detection limit on reagent blanks, 0.015-0.030 on typical gold ores)
• Independent of sample matrix, chemistry or mineralogy
• Fully-automated