Key Highlights

  • Diatreme Resources (ASX:DRX) reported on 22 July 2026 that it completed the sale of the Cape Flattery Silica Project to Cape Silica Holdings, its joint venture company with Sibelco, receiving about $2.1 million of cost reimbursement.
  • The silica sand resource base expanded to 632.8 million tonnes, including a maiden 102.7 million tonne resource at the Casuarina Deposit and a 10.6% upgrade at the Si2 Deposit.
  • Total cash was $7.2 million at 30 June 2026, including $4.5 million held in the silica projects joint venture, and the $1 million debt facility was extended to 30 May 2027.

Diatreme Resources Limited (ASX:DRX) released its Quarterly Activities Report for the period ended 30 June 2026 on 22 July 2026. The report covers the Northern Silica Project in Queensland, the sale of the Cape Flattery Silica Project, the Cyclone Zircon Project and the company's corporate and cash position.

This article describes the company, the sector context, the report and the factors that may influence its activities.

About Diatreme Resources

Diatreme Resources Limited is an ASX-listed company based in Brisbane, Queensland. Its flagship asset is the Northern Silica Project (NSP) in Far North Queensland, a silica sand project that is moving through final approvals, financing and development processes. The company also holds the Cyclone Zircon Project and has sold its Clermont Copper/Gold Project.

Diatreme does not report production revenue. Its silica projects are held partly through a joint venture with Sibelco, and the company reports cash held in the silica projects joint venture separately from its own cash.

Sector backdrop

High-purity silica sand is used in glass, solar panels, foundry and other industrial applications. Projects in Far North Queensland, such as those near Cape Flattery, rely on port access and on agreements with native title holders and communities for their development.

Environmental Impact Statements (EIS) form part of the approvals process for new mining projects in Queensland. A Draft EIS is submitted for review, and the project proceeds through assessment, public comment and a decision.

Companies often use joint ventures with industry partners to fund and progress projects, and these can involve call options and cost reimbursements.

Quarterly Activities Report released on 22 July 2026

Cape Flattery sale and corporate

During the quarter Diatreme completed the sale of the Cape Flattery Silica Project (CFSP) to Cape Silica Holdings (CSH), the Diatreme/Sibelco joint venture company, and received reimbursement of about $2.1 million for agreed costs. After Sibelco exercised a call option after quarter-end, total funding received by CSH under the transaction was about $7.4 million before costs and applicable stamp duty, and a further $4.4 million was received by CSH post-quarter.

The company's cash and cash equivalents were $2.7 million, not including a further $4.5 million in the silica projects joint venture, for total cash of $7.2 million at 30 June 2026. Diatreme secured a further 12-month extension to its $1 million debt facility, with maturity extended to 30 May 2027. Payments to related parties were $115,000, comprising $88,000 of director fees and $27,000 for specialist marketing consultancy services provided by a related party of one director. A new Chair took office on 17 June 2026, and all seven resolutions at the 29 May 2026 AGM passed on a poll.

Silica resources and Cyclone

The company reported a 10.6% upgrade to the Mineral Resource Estimate for the Si2 Deposit, to a total of 301.5 million tonnes of silica sand, with mineralisation extending to the south-east. A maiden estimate of 102.7 million tonnes for the Casuarina Deposit, contiguous with the existing Cape Flattery Silica Mine, lifted the total silica sand resource base to 632.8 million tonnes. The annual report also referred to the submission of a Draft EIS for the NSP and improved heavy mineral recoveries from the Cyclone Zircon Project.

September quarter focus

Planned activities include negotiations with Ports North for access to infrastructure at the Cape Flattery port, progression through the EIS approvals process, completion of a Pre-Feasibility Study and maiden Ore Reserves, community engagement and negotiation of a mining project agreement with Hopevale Congress Aboriginal Corporation RNTBC, Walmbaar Aboriginal Corporation RNTBC and affected native title holders. At Cyclone, the company plans processing test work to confirm previous drilling results for potential customers and investors.

Core growth drivers and material operating risks

Core growth drivers

The items identified are the EIS process, the Pre-Feasibility Study and maiden Ore Reserves for the NSP, agreements with Ports North and native title holders, and the processing test work at Cyclone.

Material operating risks

The NSP depends on approvals, port access, a mining project agreement and financing, none of which was completed in the quarter. The company's own cash of $2.7 million is small relative to development needs, and its debt facility matures on 30 May 2027. Resource estimates may change with further work, and the Cyclone Zircon Project requires test work and site visits to confirm earlier study assumptions.

The report lists Diatreme's FNQ silica sand projects as the focus for the September quarter, with the Northern Silica Project progressing through the EIS, a Pre-Feasibility Study and maiden Ore Reserves. The company also refers to meetings with potential project partners and investors in Tokyo and Washington for the Cyclone Zircon Project, which it describes as a critical minerals project. Neither the NSP nor Cyclone has a funding package or final approvals reported in the quarter, and the company's reported cash excludes amounts held in the joint venture.