Galileo Mining has announced the maiden Mineral Resource Estimate (MRE) for the Callisto deposit – the first of its type identified in Australia – within the company’s 100 per cent owned Norseman project in Western Australia. 

Galileo engaged Cube Consulting to complete the maiden MRE for the deposit.

Highlights of the Maiden Indicated and Inferred MRE for the Callisto deposit include: 

  • 17.5Mt at 1.04g/t 4E¹, 0.20 per cent Nickel (Ni), 0.16 per cent Copper (Cu) (2.3g/t PdEq² or 0.52 per cent NiEq³)
  • Contained metal includes 585,000oz 4E, 35kt Ni and 28kt Cu (~1.27Moz PdEq or approximately 91,000t NiEq)
  • Approximately 8Mt (46 per cent) of the resource is inside the indicated category with a 2.5g/t PdEq grade or 0.58 per cent NiEq (metal content within indicated resource category of approximately 639,000oz PdEq or approximately 45,800t NiEq)

The Callisto deposit is an undercover discovery found after a review of two drill holes which targeted a geophysical electromagnetic conductor. 

While the source of the conductor was a sulphidic sediment it was noted that the drill holes had passed through a band of weakly disseminated sulphide mineralisation in the overlying ultramafic intrusive rock. 

Recognition of the mineralised intervals, the interpretation of increasing metal grades to the east, and understanding the context of the potential mineralisation within the broader regional ultramafic geology provided the drill target which led to the discovery. 

A regional interpretation of prospective rock units shows that the mafic-ultramafic sill complex which hosts the Callisto deposit is continuous over 20km of strike length. 

The potential occurrence of additional mineralisation within the host rock complex is now the focus of Galileo Mining’s exploration activity, with drill programs and geophysical IP surveys planned to advance the project toward new discoveries. 

Galileo Managing Director, Brad Underwood, said that the discovery of the Callisto deposit has been a major breakthrough in understanding the geology and prospectivity at the company’s Norseman project. 

“We have now defined a significant resource from a total of 147 drill holes (38,695m) within an established mining district of Western Australia,” Mr Underwood said.  

“The discovery occurs on a granted Mining Lease just 15km from the town of Norseman and with extensive nearby infrastructure including gas pipeline, water pipeline, railway, and sealed highway.

“The nature of the mineralisation at Callisto is analogous to the Platreef deposits in South Africa where several deposits occur over a strike length of tens of kilometres. Applying this knowledge, we will broaden our search for more discoveries starting with the prospective areas at our North and South Callisto prospects.”

Mr Underwood said that this search space will encompass the full 20km of the prospective host rocks at the Callisto trend and the further 12km of prospective strike length at the Mission Sill prospect where similar geology has been intersected in drilling.

“We believe the potential for new discoveries within our project area is high and will be undertaking extensive drill campaigns aimed at generating new discoveries. The next drill program will test targets at both South and North Callisto prospects and is scheduled to commence in late October. 

“We very much look forward to getting these drill campaigns underway in this exciting new mineral province.”


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