Iltani’s Orient silver–indium project: 2025 drilling and mine design takeaways
Reviewed by Joe Ashwell

First reported on Australian Mining
30 Second Briefing
Iltani Resources’ Orient project in North Queensland, billed as one of Australia’s largest silver–indium developments, has reported standout 2025 drilling results that support a potential resource expansion. The polymetallic system targets silver, indium, zinc and lead, with recent intercepts extending known mineralisation along strike and at depth beyond the current drilling grid. Iltani is now planning follow-up step-out drilling and updated resource modelling, which could materially influence mine design, metallurgical testwork priorities and long-term development options for the Orient tenements.
Technical Brief
- Orient project is located in North Queensland, implying tropical rainfall, soft ground and potential pit dewatering challenges.
- Silver–indium association suggests epithermal or polymetallic vein systems, influencing expected vein continuity and ground conditions.
- Polymetallic nature (Ag–In–Zn–Pb) will drive complex flotation flowsheet design and differential recovery testwork.
- Indium credits can materially affect cut-off grade optimisation and pit shell economics in Whittle-style studies.
- High indium content typically concentrates in sphalerite, so zinc deportment studies will be critical for circuit design.
- Any resource expansion at Orient will likely require staged geotechnical drilling for pit slope design and hydrogeology.
- North Queensland setting raises cyclonic wind and intense rainfall design criteria for surface infrastructure and TSFs.
- Similar silver–indium systems globally often transition underground as depth increases, affecting long-term geotechnical strategy.
Our Take
Among the 47 keyword-matched pieces on silver and indium in our database, very few are Australia-based, so the Orient project in North Queensland stands out as one of the more advanced attempts to position indium as a co-product rather than a minor by-product of base metals processing.
For silver projects in Australia, North Queensland assets like Orient typically face cyclonic weather and access constraints, which often pushes operators such as Iltani Resources to front-load geotechnical and hydrological work in their 2025 drilling and study programmes to de-risk future open-pit or underground designs.
Indium-linked stories in our coverage are usually tied to electronics and solar supply chains rather than primary mining, suggesting that if Orient can demonstrate consistent indium grades, Iltani Resources may gain leverage in offtake talks with downstream tech and PV manufacturers seeking non-Chinese supply.
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.
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