Below the 900 Fault & Western Splay
Systematic exploration prior to the closure of the mine in 2016 led to successive upgrades to the Savannah Resource over many years. A maiden Resource of 905kt @ 1.65% Ni for 14,900t Ni was announced by the Company in August 2015 for the sub 900 Fault Zone.
In early 2014, the Company announced it had intersected 89.3m @ 1.6% Ni and followed it up with another significant intersection of 33.7m @ 1.56% nickel at Savannah North approximately 600 metres north of the original Savannah orebody. Underground drilling completed between April and July 2015 from the new, purpose developed, 1570 Savannah North drill drive provided an interim Resource estimate of 3.15Mt @ 1.75% Ni for 55,200t Ni for Savannah North. The Savannah North resource consists mostly of two separate mineralised zones; an “Upper Zone” and a “Lower Zone”.
Savannah North Near Mine Exploration
Resource Open – The Savannah North resource drilling programs completed to date have not tested the full potential of the Savannah North mineralised system. The Upper Zone Resource remains open to the east and west and the Lower Zone Resource remains open down dip to the northwest.
The potential strike extent of the Upper Zone is estimated to be ~2km based, in part, on the large, highly conductive on and off-hole EM responses identified. Only approximately half of the potential Upper Zone strike extent has been tested by resource drilling completed to date.
- Mineral Resource drilling completed to date is mostly confined to the Savannah North Upper and Lower zones within an area between 5600mE to 6250mE
- Exploration drilling and associated DHEM surveying indicates the Savannah North mineralisation may extend well beyond this area
- Exploration upside includes:
- Only half of the potential Upper Zone mineralisation has been adequately tested
- The Upper Zone remains open up-plunge to the east and down-plunge to the north-west
- The Lower Zone remains open down-plunge to the north
- The faulted continuation of the Savannah intrusion located below the Savannah North orebody also remains a high priority exploration target
The Company resumed exploration activities in 2018 to drill test four under-explored layered mafic-ultramafic intrusions located near Savannah. The impetus and focus of the 2018 exploration program was driven by the results of a series of Panoramic / Minerals Research Institute of WA (MRIWA) funded research projects with CSIRO Mineral Resources. The aim of the research projects, which commenced in 2015, was to improve the Company’s understanding of the petrography, mineralogy, geochemistry and geochronology of the Savannah Style layered mafic intrusions and the origin and emplacement mechanisms of their parental melts.
A number of layered mafic-ultramafic intrusive bodies with many Savannah Style similarities occur close to Savannah. The Company intends to target these bodies for further exploration in the coming years.
Priority intrusive bodies that will be targeted include Dave Hill, Wilson Creek, Subchamber D and Frog Hollow. Little or no modern exploration has been conducted on these intrusions. Previous drilling by Panoramic has demonstrated that both Dave Hill and Wilson Creek host disseminated/blebby magmatic nickel-copper sulphide mineralisation. Past drilling has been minimal and has not tested the most prospective basal parts of these intrusive bodies.
Prior to 2018, past exploration by Panoramic at Dave Hill was limited one 700 metre deep diamond drill hole and five shallow RC holes. Wilson Creek had one 500 metre deep diamond drill hole and seven shallow RC holes. Past exploration on Subchamber D was restricted to a single diamond drill hole, while the Frog Hollow intrusion has never been drill tsted.
The research conducted by CSIRO Mineral Resources on Subchamber D, Dave Hill and Wilsons concluded that all three intrusions were emplaced at the same time and by the same magmatic event that was responsible for the emplacement of the mineralised Savannah and Savannah North intrusions. Consequently, the CSIRO considers all three intrusions to be highly prospective for Savannah Style magmatic nickel-copper sulphide mineralisation. The Frog Hollow intrusion, which has never been drill tested, was not part of the CSIRO research project but is included in the Company’s future exploration plans based on its many geological similarities with the other Savannah Style intrusions.