MGX Resources Limited Appoints Macmahon Underground Pty Ltd as Preferred Contractor for CTPJV Groundrush Exploration Decline

MGX Resources Limited (ASX: MGX) announced on 21 April 2026 that its 50‑per‑cent stake in the Central Tanami Project Joint Venture (CTPJV) has selected Macmahon Underground Pty Ltd—an operating arm of Macmahon Holdings Limited (ASX: MAH)—as the preferred mining contractor for the Groundrush exploration decline.

Strategic Significance

The Groundrush exploration decline sits within the Tanami region of the Northern Territory, a zone where the CTPJV has already demonstrated a robust drilling programme and encouraging mineralogical indications. By appointing a seasoned underground contractor, MGX and Tanami Gold NL (ASX: TAM) are positioning the joint venture to accelerate the transition from exploration to development.

Macmahon Underground brings a proven track record in complex underground operations, a reputation for safety excellence, and cost‑control discipline that aligns with the CTPJV’s disciplined capital allocation strategy. The partnership is expected to deliver a faster, more efficient resource definition and to reduce the time‑to‑first‑production window for the venture.

Market Context

MGX’s share price, trading at AUD 0.41 as of 16 April 2026, sits near the lower end of its 52‑week range (AUD 0.255–0.495). Despite a negative price‑earnings ratio of –15.3, the company’s market cap of approximately AUD 484 million reflects investor confidence in its resource potential and its strategic partnership model. The recent contractor appointment is likely to be viewed as a catalyst that could lift the share price closer to its 52‑week high, particularly if the contractor’s expertise translates into measurable cost savings and accelerated resource milestones.

Forward‑Looking Outlook

  1. Resource Definition Acceleration – With Macmahon’s underground expertise, the CTPJV is projected to complete a high‑resolution decline by Q3 2026, providing a clearer picture of the deposit’s economic viability.
  2. Capital Efficiency – The contractor’s proven cost‑management framework is expected to reduce the JV’s exploration spend by 10–15 % relative to industry averages.
  3. Risk Mitigation – The appointment mitigates key operational risks associated with underground development, including ventilation, ground control, and logistical challenges in the remote Tanami region.
  4. Investor Appeal – Demonstrated progress toward a definitive mine plan is likely to enhance MGX’s attractiveness to value‑focused investors, potentially supporting an upward revision of the company’s valuation multiples.

In sum, the selection of Macmahon Underground Pty Ltd as preferred contractor represents a decisive step forward for MGX Resources and Tanami Gold NL. The partnership’s focus on efficiency, safety, and rapid resource definition positions the joint venture to capitalize on the Tanami region’s high‑grade iron ore potential and to deliver shareholder value in the medium term.