As prices for heavy rare earths, scandium and gallium surge, Mount Ridley Mines has initiated a strategic re-assay program of 3300 historical drill pulps. The move aims to deliver low-cost, near-term resource growth for a suite of critical minerals at its Grass Patch project near Esperance in Western Australia.
Unlocking hidden value from historical data
The company states that the program is a high-impact pathway to unlock existing value from a massive resource footprint, targeting upgrades and expansions for high-demand heavy rare earth elements (HREE), scandium and gallium resources. This initiative follows a recent data deep dive that revealed a remarkable opportunity: a stockpile of approximately 17,000 drill pulps from previous campaigns that were never assayed for scandium.
For those familiar with market-moving events, this strategy should ring a bell. Last year, a similar re-assaying exercise by Mount Ridley for the then-overlooked mineral gallium resulted in the company reporting a massive 838.7-million-tonne gallium resource in October. The news propelled the company’s share price upward, surging more than tenfold and demonstrating how much value can be hidden in plain sight within old data.
First batch of samples selected
Mount Ridley says its first batch of samples has been selected from 134 historical diamond and air-core drillholes to fill gaps in existing assay data across its Grass Patch Complex. In addition to testing for scandium, the program is expected to improve data coverage for HREE and gallium mineralisation. Management believes that advances in modern analytical techniques and lower detection limits could provide a more complete understanding of historically drilled samples.
The beauty of this approach lies in its efficiency, allowing Mount Ridley to potentially expand its resource inventory at low cost through re-assaying. Allister Caird, managing director and CEO of Mount Ridley Mines, commented: "This program represents a fantastic opportunity to unlock additional value from our extensive historical sample inventory in a low cost and time efficient manner. The identification of a large volume of unassayed pulps provides a clear pathway to potentially expand and upgrade the Mineral Resource across our high value asset base at Mount Ridley."
Flagship project and existing resources
The company’s flagship Mount Ridley project is located 25 kilometres north of the deep-water port of Esperance and already hosts defined resources of HREE, scandium and gallium, delineated from about 70,000 metres of historical drilling. A recent inferred resource came in at 122.6 million tonnes grading 889 parts per million (ppm) total rare earth oxides (TREO), containing 108,954 tonnes of contained TREO, with 44,610 tonnes of that in the HREE basket.
While substantial work has already been completed, the project remains largely underexplored relative to its scale and geological endowment, with several walk-up drill targets ready for drilling.
Repeating recent success
Mount Ridley says it is essentially looking to repeat its recent success by turning old samples into new numbers on the resource ledger. The market has already witnessed what can happen when the company dusts off its historical samples and gives them a fresh look with modern technology. While there is never a guarantee that lightning will strike twice, the logic is sound. With a fresh batch of 3300 samples on the way to the lab, it might not be long before we see if this particular treasure hunt pays dividends once again.
