Maritana Minerals (ASX: MRT)

Maritana Minerals Limited (ASX: MRT) was Horizon Minerals (ASX: HRZ) until April 2026. Both codes still turn up in search and in older announcements, so MRT and HRZ are the same company.

It is an emerging gold developer and producer advancing a portfolio of assets across Western Australia's prolific Eastern Goldfields.

Following its transformational merger with Poseidon Nickel and the subsequent Gordons acquisition, the company holds a mineral resource base of around 1.88Moz of gold (34.32Mt at 1.7 g/t Au) across roughly 1,386 km² of tenure in some of Australia's most productive gold belts.

Maritana Minerals holds a 100% interest in gold projects in the Kalgoorlie and Coolgardie regions, including the 428,000oz Boorara project and 1,372,000oz in satellite projects in close proximity.

At the centre of Maritana's strategy is the Black Swan Processing Hub, located approximately 50km from Kalgoorlie. Acquired as a brownfield concentrator through the Poseidon Nickel merger, the plant is being refurbished and converted into a gold Carbon-in-Leach (CIL) operation, with front-end engineering design lifting planned nameplate throughput to 2.5Mtpa.

Carbon-in-Leach, which we shorten to CIL, is a way of getting gold out of crushed ore. The ore is leached in a tank and the dissolved gold is picked up on activated carbon, which is later stripped to recover the metal. A brownfield plant is one that already exists, so refurbishing it is normally cheaper and quicker than building from nothing.

Samso's coverage of MRT on the ASX, and of HRZ before the name changed, includes the Black Swan pre-feasibility study, the Burbanks drilling and the Gordons Dam acquisition.

Last reviewed 22 September 2026.