Great Boulder Resources expands shallow gold mineralisation at Mulga Bill prospect

Australian mineral exploration company Great Boulder Resources (ASX:GBR) has expanded the shallow gold mineralisation at the Mulga Bill prospect, located within the Side Well Gold Project in Western Australia.

Speaking to, Great Boulder Resources Managing Director Andrew Paterson says the recently completed Side Well aircore (AC) program comprised 97 holes for 10,361m. 

The MD tells this news service the company uses AC drilling to look for alteration, pathfinder anomalism, and bottom-of-hole gold anomalism.

Results for the first 25 holes were reported on 13 April, which were all completed at the Flagpole prospect. New results include more holes drilled at Flagpole, a small program around Loaded Dog, and a series of drill fences immediately east and northeast of Mulga Bill.

Drilling highlights from around Mulga Bill includes drillhole 23SWAC054 with 1m @ 8.78g/t Au from 98m; 23SWAC068 with 4m @ 2.29g/t Au from 88m; and 23SWAC066 with 16m @ 1.66g/t Au from 52m including 8m @ 2.78g/t Au from 56m.

Great Boulder suspects the results on 23SWAC066 possibly represent the near-surface expression of a ‘high-grade vein dipping west towards the HGV Zone, and notes the intersections in holes 23SWAC068, 23SWAC069, and 23SWAC070 might represent the same vein.

Paterson adds: “To get a couple of fairly thick intersections of plus 1g material is really a very good result. But more importantly, it’s just outside the resource and sort of opened up an area 200m to 300m wide immediately east of the high-grade vein (HGV) area in Mulga Bill. 

We think some of these intersections might be near-surface expressions of those high-grade veins. So they tend to be those west-dipping veins, so they would be dipping back towards Mulga Bill at depth, and it’s opened up quite a big new target area near the resource, but outside the resource and really there’s bugger all drilling in that space, so it looks like a great potential target to be hitting with RC.

“We didn’t have too many expectations, it was I suppose an obvious gap in drill coverage that needed to be tested, like a box that needed ticking, but in that sense, we didn’t really know what we would find”

We didn’t have too many expectations, it was I suppose an obvious gap in drill coverage that needed to be tested, like a box that needed ticking, but in that sense, we didn’t really know what we would find. So it was kind of a big open space and that’s why we’re pretty happy to find something in there and interested to get in with the RC rig and test it at depth.”

Paterson says the company plans to mobilise a diamond drill rig to Mulga Bill possibly in May, and is currently working on an Aboriginal heritage discussion ahead of testing regional targets.

The MD also believes testing these regional targets is the next big step change in discovery at Side Well.

“Given that we’re just north of 500,000 ounces now and we have multiple other targets to test, we’re hoping to find another 500,000 ounces in those new areas.That’s why we’re kind of chomping at the bit to get out and into these targets, so that’s probably going to be the big priority for the second half of the year.”

Great Boulder reports the reverse circulation (RC) rig is currently testing targets at Mulga Bill North, north of the Proterozoic dyke. The company says holes will now be designed to test primary mineralisation within the target area.

Great Boulder Resources is an Australian mineral exploration company with a portfolio of ‘highly’ prospective gold and base metals assets in Western Australia. 

The company’s core focus is the Side Well Gold Project at Meekatharra that hosts an inferred mineral resource of 6.192 million tonnes @ 2.6g/t Au for 518,000 ounces. The company is also progressing early-stage exploration at the Wellington Base Metal Project in the MVT province.

Images: Great Boulder Resources Ltd
Written By Harry Mulholland
Hailing from the Central Coast region of NSW, Harry is a passionate journalist with a background in print, radio and ESG news. When not bashing away on his keyboard, he can be found brewing a coffee or playing with his dog.