Ora Banda Mining Ltd (ASX:OBM) has received further high-grade gold results from resource definition drilling at the Callion project in Western Australia’s North-Eastern Goldfields and is now upgrading the resource model.

The best results from drilling of underground targets are 8 metres at 20.2 g/t from 118 metres and 8 metres at 16.4 g/t from 139 metres while the best result from open-pit targets is 2 metres at 6.95 g/t from 109 metres.

High-grade nature “shines through”

Ora Banda managing director David Quinlivan said: “Receiving these results now allows us to move forward with the progression of the Callion mineral resource update.

“Pleasingly, the high-grade nature of this deposit continues to shine through.”

Phase one and two drilling has now concluded with a total of 53 reverse circulation (RC) holes for 6,938 metres and 17 diamond tails for 1,948 metres.

Drilling results

Other strong underground target results:

  • 10 metres at 3.5 g/t from 158 metres,
  • 1.4 metres at 16.9 g/t from 179 metres, including 1 metre at 22.6 g/t,
  • 2.6 metres at 8.35 g/t from 183 metres, and
  • 2 metres at 9.68 g/t from 124 metres

Another open-pit target highlight is 7 metres at 1.7 g/t from 102 metres, including 3 metres at 3.34 g/t.

These results follow those from January 2020 with best underground target results of 4.8 metres at 34.4 g/t from 232 metres, including 0.3 metres at 498.2 g/t and 1.2 metres at 15.7 g/t from 220 metres and open-pit target results of 10 metres at 8.0 g/t from 76 metres and 5 metres at 3.3 g/t from 73 metres.

Historical workings

The existing Callion open pit is about 650 metres long and 40 metres deep, with the underground workings extending off the southern end of the pit to a vertical depth of 220 metres below surface.

This deposit has been mined underground by various operators since the early 1900s and has an historical published resource of 169,000 tonnes at 2.6 g/t for 14,000 contained ounces, which was constrained above the 350 metres reduced level (80 vertical metres below surface) to assess remnant open-cut potential only.

The recent batch of results from the underground diamond drilling is of note because hole CNRC19032 that returned 8 metres at 16.4 g/t from 139 metres intersected the along-strike continuation of the high-grade shoot associated with the historical main underground mining area.

Developing the deposit

The conceptual development plan for Callion deposit includes an open-pit cut-back to re-establish underground access and rehabilitating existing underground mine development where required to extract several high-grade zones remaining within the upper sections of the historical mine.

This will be followed by the development and extraction of new high-grade areas below the existing mine workings.

Ora Banda is focused on a mineral resource upgrade that will include both open pit and underground potential going forwards.