Geology and Exploration
The Heemskirk Tin deposits are granite related cassiterite and basemetal stockwork and replacement style mineralisation hosted in older sediments and volcaniclastics of the Zeehan Sub Basin, Western Tasmania. Mineralisation is generally stratabound. The stratabound mineralisation is structurally controlled on fold/fault dilation zones between lithologies of contrasting rheology.
Schematic Geology Cross-Section Showing Queen Hill and Severn Tin Deposits
To the end of the 2023 Phase 2B Drilling Program, a total of 75 diamond drill holes (28,620m) have been completed by Stellar over the Heemskirk Tin deposits (Severn, Queen Hill and Montana) since 2010. A further 97 historic diamond drillholes (25,237m) have been completed prior to 2010 by other companies over the Heemskirk deposits.
In total, 172 diamond drill holes (53,857m) have been drilled over the Heemskirk Tin deposits.
The Severn tin deposit is a north trending, moderate to steeply east dipping and north plunging deposit with a strike length of over 500m, a width of 3-50m and down dip extent over 700m. The Severn tin deposit comprises of 3 main zones of mineralisation within a broader sulphide halo; the Main Lower Ore Zone (201), the Middle Ore Zone (202) and the Upper Ore Zone (203).
The Queen Hill tin deposit is a north trending, moderate to steeply east dipping and north plunging deposit with a strike length of over 450m, a width of 2-30m and down dip extent over 500m. The Queen Hill tin deposit comprises of 3 main zones of mineralisation within a broader sulphide halo; the Main Upper Ore Zone (301) the Middle Ore Zone (302) and the Lower Ore Zone (303).
Mineralisation in all of the Heemskirk deposits remains open down plunge. Tin occurs principally as cassiterite with minor stannite and base-metal sulphides located towards the top and periphery of the Queen Hill and Montana Deposits.