Great Boulder

Great Boulder Resources uncovers potential ‘large’ hydrothermal gold camp at Side Well Project, WA

Mineral exploration company Great Boulder Resources (ASX:GBR) reports auger analysis from 2 prospects have indicated a ‘large’ hydrothermal gold camp stretching over 12km of strike at the Side Well Gold Project in Western Australia.

The company says results from a series of exploration targets announced in September in the area between the Ironbark Prospect and the southern tenement boundary represent a ‘significant’ breakthrough in its regional exploration program. These targets highlight the potential scale of gold mineralisation along the eastern limb of the syncline, comparable in strike extent to the Paddy’s Flat gold camp hosted on the western limb.

Great Boulder reports it has now completed infill auger sampling over the Ironbark South grid, with over 1,300 samples collected at a 200m by 50m grid cell size. The additional data density has confirmed and refined the new targets which will be tested by aircore (AC) drilling in 2023.

Analysis of the auger data concludes the presence of pathfinder anomalism together with gold, arsenic, and some copper suggests Side Well is a ‘large-scale’ hydrothermal camp. The scale of the anomalism over 12km is now equivalent to the strike extent of the Meekatharra camp.

It further states this hypothesis explains both the intrusive-related characteristics of Mulga Bill and the orogenic style of Ironbark which is likely to represent remobilisation of mineralising fluids into a ductile environment inboard from the granite contact.

Great Boulder Managing Director Andrew Paterson says: “The infill auger sampling south of Ironbark has provided increased definition on multiple targets.

“The infill auger sampling south of Ironbark has provided increased definition on multiple targets”

Further assessment of all the data supports our long-standing view that we are starting to uncover a significant hydrothermal gold camp which is comparable in scale to the Meekatharra gold camp with a 12km long strike footprint. This represents an opportunity of enormous untested potential.”

Great Boulder also reports results have been received from reverse circulation (RC) drilling at Mulga Bill where 12 holes were completed and Ironbark where 9 holes were drilled  up to the end of October.

Significant intercepts recorded include 8m @ 6.51g/t Au from 96m including 4m @ 11.85g/t Au from 96m in 22MBRC094 located at Mulga Bill; 24m @ 1.19g/t Au from 68m including 8m @ 2.76g/t Au from 76m in 22IBRC039 located at Ironbark; as well as 4m @ 1.15g/t Au from surface in 22IBRC043 also at Ironbark.

Paterson says: “These are the final batches of assays from RC drilling at Mulga Bill and Ironbark. We have demobilised the rig to give our field team a chance to complete geological mapping down the eastern side of Side Well including Ironbark and Ironbark South.

We have priority drill targets for the next round of drilling, including the new eastern zone at Mulga Bill as well as depth and strike extensions at Ironbark. We will also be testing further extensions of the HGV area at Mulga Bill, looking to extend the HGV along strike to the north and south.”

Side Well

On top of these findings, Great Boulder also reports during October rock chip samples were taken during field reconnaissance at Ironbark South, with 2 samples taken from a cluster of shallow historic workings around 1.5km from the southern tenement boundary.

These samples returned 7.34g/t Au, which the company states is significant as it confirms the presence of ‘high-grade’ gold-bearing structures at Ironbark South, and it confirms gold close to the surface. The latter observation is based on the fact that the shafts from which the quartz sample originated are less than 10m deep.

The company says its field team has commenced geological mapping of structure and stratigraphy from Ironbark to the southern tenement boundary to improve its understanding of the Polelle Syncline.

Great Boulder reports this mapping will assist in prioritising new areas for further exploration, and the team will also start mapping north from Ironbark in an ongoing program as time permits.

Regional auger sampling over the eastern stratigraphy including the area north of Ironbark will continue to infill the previous 400m by 50m grid to 200m by 50m coverage.

The geological team is also working to incorporate recent drilling results into the mineralisation models for Mulga Bill and Ironbark in order to update and refine wireframes of all mineralisation defined to date. These wireframes will be used as the basis for a maiden mineral resource estimate (MRE) that Great Boulder is aiming to complete in Q1 2023.

Great Boulder Resources is a mineral exploration company with a portfolio of gold and base metals assets ranging from greenfields through to advanced exploration in Western Australia.

The company’s core focus is the Whiteheads and Side Well Gold Projects, as well as the Wellington Base Metal Project.

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.