Great Boulder Side Well update: 1.5km strike growth and pit potential for planners
Reviewed by Tom Sullivan

First reported on Australian Mining
30 Second Briefing
Great Boulder Resources has extended gold mineralisation at the Mulga Bill East prospect at its Side Well project near Meekatharra, Western Australia, to 1.5km of strike, enlarging the mineralised corridor beyond the current JORC Mineral Resource envelope. The new drilling defines continuous gold-bearing structures east of the main Mulga Bill lode system, opening additional targets for step-out RC and diamond drilling. For mine planning and geotechnical teams, the longer strike length may support larger open-pit shells or staged underground development if grades and widths are confirmed.
Technical Brief
- The mineralised corridor lies outside the existing JORC Mineral Resource, implying future resource re‑optimisation work.
- Step‑out RC drilling is the primary method defining the new mineralised structures east of Mulga Bill.
- Diamond drilling is planned to refine structural controls and provide geotechnical data for potential pit or underground designs.
- New lodes east of the main Mulga Bill system may require updated pit shell geometries and wall design sectors.
- For similar greenfields‑to‑brownfields transitions, early geotech logging of step‑out core accelerates mine design trade‑offs.
Our Take
Great Boulder Resources’ acquisition of the Peak Hill Gold Project from Westgold for $54.4 million in Western Australia signals a strategy of building a critical mass of gold ounces in the region, so incremental resource growth at Side Well and Mulga Bill East is likely being targeted to leverage that broader regional footprint.
With a 1.5 km strike length already defined at the Mulga Bill East gold system, Side Well fits a pattern in our database of WA gold projects where juniors focus on demonstrating continuous, structurally controlled mineralisation to support future hub-and-spoke processing options rather than stand-alone plants.
Gold remains one of the most frequently covered commodities in our Mining category and keyword-matched pieces, suggesting that any resource upgrade at Side Well could attract disproportionate market attention compared with similarly sized advances in less-followed metals.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
Related Articles
Related Industries & Products
Mining
Geotechnical software solutions for mining operations including CMRR analysis, hydrogeological testing, and data management.
Construction
Quality control software for construction companies with material testing, batch tracking, and compliance management.
CMRR-io
Streamline coal mine roof stability assessments with our cloud-based CMRR software featuring automated calculations, multi-scenario analysis, and collaborative workflows.
HYDROGEO-io
Comprehensive hydrogeological testing platform for managing, analysing, and reporting on packer tests, lugeon values, and hydraulic conductivity assessments.
GEODB-io
Centralised geotechnical data management solution for storing, accessing, and analysing all your site investigation and material testing data.