Highlights

  • Ark updated the Sandy Mitchell mineral resource to 379.4 million tonnes at 5,430ppm monazite equivalent.
  • Measured and indicated resources represent approximately 97% of the updated mineral resource tonnage.
  • Metallurgical testwork demonstrated substantial phosphate removal and light rare earth extraction from project material.
  • An updated scoping study outlined a potential 26-year operation and AUD 383.6 million pre-production capital.

Ark Mines (ASX:AHK) entered November with attention on its latest project activities and the milestones outlined in its September-quarter reporting. Its shares were priced at AUD .285 on 2 November 2026, up 5.56% in the trading figures for the session. The company’s operational agenda is shaped by several developments that need to be assessed separately: the work completed, the technical evidence gathered and the steps still planned. The distinction is particularly important for an exploration-stage business, where a successful programme may generate targets without establishing a producing asset.

Sandy Mitchell Resource Expands

Ark Mines reported an updated mineral resource estimate for its Sandy Mitchell Rare Earth Elements and Heavy Minerals Project of 379.4 million tonnes at 5,430 parts per million monazite equivalent. The September 2026 Quarterly Report described a 428% increase in resource tonnes compared with the October 2024 measured estimate of 71.8 million tonnes. This expansion is a resource-estimation milestone rather than evidence that Mining has commenced. Mineral resources also remain distinct from ore reserves and demonstrated project economics.

Resource Classification Strengthens

Of the updated total, 73.2 million tonnes were classified as measured, 296.4 million tonnes as indicated and 9.8 million tonnes as inferred. Together, measured and indicated material accounted for 369.6 million tonnes, or approximately 97% of the total resource by tonnage. The estimate was reported using a 1,957 parts per million monazite-equivalent lower cut-off grade. Classification provides information about geological confidence but does not remove the need for technical and commercial development work.

Processing Tests and Study Parameters

The company reported metallurgical testwork that achieved approximately 97% phosphate removal and around 98% light rare earth extraction through a hydrochloric acid leach route. Post-quarter testing also indicated high light rare earth extraction from monazite concentrate. An updated scoping study described a potential 26-year operation processing 13 million tonnes annually. Its reported post-tax net present value was AUD 883 million with a 29.7% internal rate of return, based on the study’s assumptions rather than guaranteed outcomes.

Capital Requirements and Development Path

The scoping study outlined estimated pre-production Capital of AUD 383.6 million including a 25% contingency, with average annual Revenue modelled at approximately AUD 348 million. These are study forecasts, not realised revenue or committed financing. Ark’s forward priorities involve further technical evaluation and steps required to advance Sandy Mitchell beyond the scoping stage. Funding, approvals, engineering and market conditions remain relevant to whether the conceptual development case can proceed.

On 2 November 2026, Ark Mines shares traded at AUD .285, gaining 5.56%. The session high was AUD .290 and low AUD .280. Market Capitalisation was approximately AUD 20.62 million, while the one-year change was -56.15%. These market figures describe trading performance and should not be confused with operational results.