Ark Mines Limited (ASX:AHK) engages in mineral exploration and development in Australia, primarily focusing on critical minerals including rare earth elements, heavy minerals, nickel, cobalt, copper, iron, scandium, chromite and manganese; it advances its flagship Sandy Mitchell Rare Earth and Heavy Mineral Project in North Queensland, which hosts an indicated mineral resource of 21.7 million tonnes at a high magnetic rare earth oxide proportion and a measured resource of 71.8 million tonnes at 1,732.7ppm monazite equivalent, alongside heavy minerals such as monazite, zircon, rutile, xenotime and ilmenite for potential revenue from concentrates and sales. The company maintains additional tenements prospective for copper, nickel, iron, cobalt and gold projects including Gunnawarra, Pluton and Mt Jesse, targeting markets in clean energy supply chains for electric vehicles, wind turbines and advanced technologies. Founded in 2007 and headquartered in Sydney at Suite 9.04a, Level 9, MLC Centre, 19-29 Martin Place, Ark Mines operates exclusively in Australia with emphasis on Queensland-based assets. Recent developments include a January 2024 memorandum of understanding with Currumbin Minerals for downstream processing of Sandy Mitchell offtake to produce heavy minerals and rare earth concentrates; a $4.5 million investment in 2024-2025 from the QIC Critical Minerals and Battery Technology Fund comprising $4 million in royalty funding and $500,000 equity to accelerate development toward late-2027 production; ongoing stage-3 resource expansion drilling ahead of schedule, metallurgical testing with IHC Mining, and a pre-feasibility study planned for early 2026.