The historic high-grade Storey’s Creek tungsten mine is located 3 km north of the similar-scale Aberfoyle tin mine, and are part of the broader mineralised system. Both prospects sit in sedimentary rocks directly above buried ‘cupolas’ of Ben Lomond Granite, which is the source of tin and tungsten mineralisation. Mineralisation is typically zoned from tin-dominant distal to the granite, becoming tungsten dominant downward toward the intrusive contact.
The deposit had a production history of more than 1.1 Mt @ 1.09% WO3 and 0.18% Sn. These production grades compare favourably with global tungsten deposits, and presents as an exciting exploration property.
The Company sees strong potential to locate additional blind vein mineralisation in the under-explored areas nearby.
Storey’s Creek Cross Section through main shaft showing mineralised vein arrays
Mineralisation at Storey’s Creek is hosted within a 30–50m wide, north-northeast striking sheeted vein array which dips to the southwest. The system can be traced along strike for 300m and extends 400m in the down dip direction.
The Ben Lomond Granite crops out approximately 1km west of the mine and has been identified at depth 180m below the surface. The principal ore minerals are wolframite and cassiterite, the grade of which varies with the distance from the cupola.
Tin mineralisation was discovered at Storey’s Creek in 1872 and sporadic mining activities have been undertaken since that time:
- 1891–1913; mining of tin and tungsten by small scale mining parties.
- 1913–1928; the Storey’s Creek Tin Mining Syndicate mined up to 12,000 t/y ore, grading between 0.75 – 1.75 % Sn and 0.75% - 2.0% WO3
- 1937–1962; The Storey’s Creek Tin Mining Company produced a total of 1.1 Mt @ 1.09% WO3 and 0.18% Sn ores.
Historical exploration to date has identified sufficient near surface and underground tin mineralisation to warrant further investigation, and the nearby unexplored areas are seen as having potential to deliver blind similar vein arrays. In order to better target priority areas the Company carried out modelling of earlier gravity data to try map the topography of the underlying granite pluton.
This work identified five anomalies: Storey’s s Creek SE, Aberfoyle SE, Golf Course West, Eastern Hill North, and Anomaly Nine. The Golf Course West anomaly requires additional gravity data to improve the reliability of the modelling. The anomalies at Storey’s Creek and Aberfoyle are a good fit with the old mines, leaving three anomalies recommended for further work.
3D sub-surface granite modelling from gravity data