The deposit is currently known over a strike length of more than 500 metres with an average width of approximately 150 metres. The depth extent of the deposit is not known with relatively minor deeper drilling having encountered mineralisation to depths of approximately 300m below surface.
The mineralisation at Great Pyramid is formed by closely spaced sheeted northeast trending, cassiterite (SnO₂) bearing veins associated with silicification and sericite-pyrite alteration. The deposit style and regional comparisons suggests that a tin-fertile granite exists at depth below the deposit, however this has not been encountered and the deposit is open at depth.
Drilling commenced at the deposit in 1964, with BHP drilling shallow percussion holes and one diamond drill hole. Between 1969 and 1974 Aberfoyle Tin drilled a series of close spaced shallow percussion holes and diamond drill holes. The Tasmanian Mines Department drilled four diamond holes in the 1970’s and Shell drilled a further two diamond holes in 1983. The final drilling on the project was in 2018 with previous owners TNT Mines drilling a single diamond drill hole.
A total of 199 holes have been drilled at the deposit with an average depth of 46m. The maximum hole depth is 348.3 m and only 5 holes deeper than 150 metres have been drilled.
The deposit’s nature and extent are not constrained laterally or vertically, and the deposit is considered open for extension in all directions.
Prior to TinOne Resources Inc., no modern geophysical methods had been conducted.
The Inferred Resource was estimated using Multiple Indicator Kriging method of 1.5 metre down-hole composites within a mineralised domain interpreted from tin grade. The estimate is restricted to the area of close spaced drilling and 90% of the resource occurs within 40m of surface. Although the limited deeper drilling has encountered mineralised material this was not included in the resource.Additional drilling utilising modern drill techniques, analytical techniques and QA/QC will be required to re-estimate the resource and report under NI 43-101.
A qualified person has not done sufficient work to classify the historical estimate as current mineral resources or mineral reserves and TinOne is not treating the historical estimate as current mineral resources or mineral reserves.
Great Pyramid oblique view showing the Inferred Resource model blocks and drill holes coloured by tin. This figure highlights that the resource is confined to shallow levels. Deeper mineralised drilling is not included in the current resource.
TinOne Resources Inc. Exploration
The principal work undertaken by TinOne Resources Inc. has been the collection of a trial 3D IP-Resistivity survey. No previous modern geophysics has ever been conducted on the project and geological observation of quartz-pyrite alteration and veining suggested to Gondwana that IP-Resistivity may be an applicable technique.
The trial survey was conducted on north westerly oriented lines and was highly successful in confirming that known mineralisation is associated with a strong chargeability response. Furthermore, the survey was highly encouraging in defining three significant targets for follow up. These targets include a major combined chargeability and resistivity target beneath and to northeast of the current resource and additional strong chargeability anomalies to south and southeast. Two of these targets are undrilled and the third has a single drillhole. The northeast and southeast targets extend to the limits of the current survey and hence are entirely open.
TinOne Resources Inc. plans to execute systematic exploration utilising modern techniques. This is likely to include:
- Additional IP/resistivity
- Reverse Circulation and diamond drilling within and below the current resource
- Reverse circulation and/or diamond drilling of IP/resistivity targets
The scientific and technical information in this website has been prepared in accordance with the Canadian regulatory requirements set out in National Instrument 43-101 (Standards of Disclosure for Mineral Projects) and reviewed and approved by Dr Stuart Smith as a Qualified Person as defined by NI 43-101 (the “Qualified Person”). Dr Smith is a Technical Adviser to the company.