106 Samples Collected as Siren Gold Targets 12km Endeavour Shear Zone

Exploration Kickoff on a Historic Shear Zone

Siren Gold Limited (ASX, SNG) has embarked on a new chapter of exploration at its Queen Charlotte Antimony-Gold Project in Marlborough, New Zealand. The company’s initial fieldwork focused on the Endeavour Shear Zone, a 12-kilometre-long geological structure known for historic antimony mining. This shear zone, striking northwest-southeast and approximately 100 metres wide, hosts several historic mines including the Endeavour Inlet, Endeavour East, and Resolution Bay mines.

During the first phase, Siren collected 106 rock samples from various mineralised outcrops along the shear zone. These samples are currently undergoing assay testing, with results eagerly awaited by the market. Early indications suggest the presence of significant gold mineralisation alongside the historically mined antimony, a dual commodity potential that could enhance the project’s value.

Historic Mines and New Gold Potential

The Endeavour Inlet Mine, once New Zealand’s largest antimony producer, was mined extensively in the late 19th century. The mine extends over 1,200 metres along strike and was exploited vertically over at least 400 metres, with potential for deeper mineralisation. Siren’s exploration has identified two key mineralised reefs within the shear zone, the Maria Reef and the Skyline Reef. The Maria Reef, previously overlooked for gold, has shown promising grades in historic sampling, including a 2015 channel sample returning 5.4 metres at 5.4 grams per tonne gold.

Siren’s recent fieldwork located six outcrops of the Maria Reef and two of the Skyline Reef, with channel sampling completed and assay results pending. The Maria Reef varies in thickness from 2 to 6 metres and consists of quartz veins, breccia, and stibnite mineralisation. The Skyline Reef features a narrower but high-grade stibnite vein. These findings underscore the potential for both gold and antimony mineralisation along the shear zone.

Strategic Importance and Next Steps

Chief Executive Officer Zane Padman emphasised the strategic significance of the Queen Charlotte Project within Siren’s portfolio, highlighting the scale and continuity of mineralisation. The company plans to expand exploration efforts with regional soil geochemistry surveys, further mapping, and locating additional mineralised outcrops. Importantly, Siren is preparing to apply for drilling access agreements with the New Zealand Department of Conservation, aiming to advance from surface sampling to subsurface drilling.

The project’s location within a Department of Conservation estate and on private land necessitates careful environmental and regulatory management, but Siren has secured a minimum impact access agreement to date. The company’s methodical approach, combining historical data with modern exploration techniques, positions it well to unlock value from both greenfield and brownfield opportunities in this underexplored region.

Historical Context and Technical Foundations

Antimony mining at Endeavour Inlet dates back to the 1870s, with approximately 3,000 tonnes of ore extracted historically. Past metallurgical testing demonstrated the potential to produce high-grade stibnite concentrate with good recovery rates. However, previous exploration largely focused on antimony, with gold potential largely neglected until recent years.

Siren’s technical director, Paul Angus, a competent person under JORC standards, oversees the exploration program, ensuring rigorous sampling and data management. The company’s commitment to quality control and systematic exploration bodes well for defining a robust mineral resource in the future.