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  • Great Boulder Resources (GBR) highlights a sulphide-rich copper zone at the Mulga Bill prospect in WA
  • The company says new diamond drill results and reviewing samples from previous RC drilling highlighted the zone of elevated copper and silver with low-grade gold mineralisation
  • New assays include peak grades of 3.44 per cent copper and 171.38 g/t silver which suggests the zone could host a “significant amount of metal”
  • Despite this, Great Boulder is focused on drilling for high-grade gold at Mulga Bill with drilling expected to continue for the remainder of 2022
  • Great Boulder Resources is down 4.04 per cent to 9.5 cents per share as of 10:56 am AEST

Great Boulder Resources (GBR) has received results from recent drilling at the Mulga Bill prospect within its Side Well project in WA.

The company said new assays from the seven-hole diamond drilling program, along with retrospective multi-element assays from earlier reverse circulation (RC) holes, have highlighted the continuity of a broad copper zone at Mulga Bill.

According to GBR, the sulphide-rich zone was recognised in previous drilling but a lack of continuous base metal assays impacted interpretation.

“After recognising the chalcopyrite-rich copper zone in our initial RC programs last year we recently started retrospectively assaying RC samples for a 48-element suite including silver and base metals,” Managing Director Andrew Paterson said.

“It’s exciting to see this zone now appears to be a large tabular zone of elevated copper and silver with low-grade gold mineralisation,” Mr Paterson said.

New copper intersections at Mulga Bill include 14.5 metres at 0.59 per cent copper, 1.17 grams per tonne (g/t) gold and 10.74 g/t silver from 189.5 metres including 0.7 metres at 2.25 per cent copper, 1.48 g/t gold and 27.1 g/t silver in 22MBDD001.

The sulphide intersection in the above hole sits within a 74.6-metre-wide zone averaging 5.76 parts per million bismuth, suggesting it sits in the centre of the alteration system.

Drill hole 21MBRC051 returned a high-grade copper and silver result of one metre at 3.44 per cent copper and 171.38 g/t silver.

“The fact that we see individual samples with copper as high as 3.44 per cent and silver at 171.38 g/t indicates this zone could host a significant amount of metal,” Mr Paterson said.

Great Boulder Resources said the copper zone findings do not change its focus on drilling for high-grade gold at Mulga Bill but it has helped it understand the project’s “full potential.”

The company expects to receive further assays from diamond drilling over the coming weeks.

Looking ahead, an aircore drilling program is underway at Mulga Bill and scheduled to move to Whiteheads to test several geochemical targets. The company will also mobilise an RC rig to the Side Well project in late June with drilling planned to continue for the remainder of the year.

Great Boulder Resources is down 4.04 per cent to 9.5 cents per share as of 10:56 am AEST.

GBR by the numbers
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