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Mardie Salt & Potash Project

The Mardie Salt and Potash Project (Mardie or the Project) is 100% owned by Mardie Minerals Pty Ltd, a wholly owned subsidiary of BCI Minerals Limited (BCI). The Project represents a rare, sustainable opportunity to develop a large-scale, multi-generational solar evaporation operation on the Pilbara coast of Western Australia (WA).

The Pilbara coast is one of the world’s premier regions for solar salt production. Five existing solar evaporation salt projects owned by Rio Tinto and major Japanese companies have been operating successfully in this region for up to fifty years, producing a high quality and reliable salt product which is consistently in high demand in the chemical and other industries.

Mardie’s site has all the critical characteristics for establishing a large-scale solar evaporation operation, including: optimum climate conditions (high temperatures, low rainfall, low humidity, and high windspeeds); a large area (~100km2) of impermeable mudflats as an ideal floor for evaporation ponds; minimal environmental and heritage sensitivities; and a coastal location for low cost shipping to Asian markets.

At Mardie, an inexhaustible seawater resource will be concentrated through solar and wind evaporation to sustainably produce 5.35 million tonnes per annum (Mtpa) of high purity sodium chloride (NaCl) salt and 140 thousand tonnes per annum (ktpa) of sulphate of potash (SOP or K2SO4) fertiliser for supply to the growing chemical and agricultural industries over an operating life of at least 60 years.

Figure 1:  Mardie Project Layout

mardie project layout new

Salt is one of the most widely used substances on earth, with over 10,000 direct and indirect uses. It has a large and mature market with approximately 335Mtpa consumed globally. SOP is a premium fertiliser containing essential macro-nutrients (potassium and sulphur) for plant growth. It accounts for approximately 10% of the global potash market of 70Mtpa, with the majority supplied as the chloride containing muriate of potash (MOP or KCl).

A Definitive Feasibility Study (DFS) was completed in July 2020 at a cost of $20M and optimised results were released in April 2021. The DFS and its optimisation were managed by BCI with support from GR Engineering Services Limited (GRES) as lead DFS engineer, and with additional support from Worley, CMW Geosciences, Preston Consulting, RPS, Roskill, Argus Consulting, Braemar ACM Shipbroking, KPMG and others. A summary of key optimised Project parameters are compared with those of the DFS in Table 1 below.

Table 1 :  Key Project Parameters


1 – Input resource is an infinite supply of natural seawater which could continue for 100+ years.

2 – All dollar values presented in Australian dollars unless specified.
3 – Excludes working capital, funding costs and Build Own Operate / Transfer (BOO/T) items partially funded by contractors.
4 – Discount rate supported by low interest rate environment and very long project life. 7% real discount rate equates to ~9% nominal.

Mardie will be the first major salt project developed in Australia in two decades and the only Australian operation producing commercially saleable salt and SOP. It will be the largest salt operation in Australia, and with the potential expansion into newly acquired tenements (not included in the optimisation), it can become one of the largest evaporative operations globally.

Production of a high value by-product from waste seawater adds downstream processing credentials to the Project, which aligns with the WA Government’s long-standing objective for the resources industry to include secondary processing in project planning.

In addition, the Project has strong “green” credentials given 99.9% of the energy requirement is derived from natural sun and wind to evaporate seawater, as defined by an independent KPMG study.

Project Description

The primary project components are below:

  • Seawater intake pumping station and evaporation ponds
  • Salt crystallisers and salt wash plant
  • KTMS crystallisers and SOP plant
  • Port facilities
  • Supporting infrastructure

The production concept involves a time-proven and low risk process. Seawater is pumped from the ocean into the first evaporation pond and progressively concentrated via natural sun and wind evaporation energy through a series of nine evaporation ponds over an eighteen-month period. Upon reaching NaCl saturation point in Pond 9, concentrated brine is transferred to the salt crystallisers where salt precipitates in solid form. The remaining brine liquid (bitterns) is drained from the salt crystallisers and raw salt is then harvested and purified in a two-stage counter-current wash plant to produce 5.35Mtpa salt with >99.5% NaCl content.

Figure 2:  Salt Wash Plant

Salt Wash Plant new

A unique attribute of Mardie compared with WA’s five existing salt producers is that it will also produce SOP as a by-product. Bitterns from the salt crystallisers, which is deficient in sodium but rich in potassium and magnesium, is pumped to the SOP crystallisers where kainite-type mixed salts (KTMS) precipitate. Approximately 1.1Mtpa of KTMS is harvested and converted to 140ktpa of granular SOP product with >52% K2O in a chemical flotation processing plant.

Figure 3: SOP Processing Plant

SOP Processing Plant new

Final salt and SOP products will be exported from a purpose-built port facility at the Mardie site. A range of port options have been studied and a transhipment facility together with a 2.4km jetty and 4.4km dredged navigation channel to open waters best satisfies the marine environment and product volumes to be exported by BCI. The jetty has been designed to withstand a 1-in 500-year extreme weather event. The navigation channel will accommodate a 12,000 deadweight tonnes (dwt) self-propelled and self-unloading transhipment vessel (TSV).

Salt product will be conveyed from salt stockpiles to the jetty head and loaded onto the TSV at a rate of 3,000 tonnes per hour (tph). SOP will be transported by truck from a SOP storage shed to a receival hopper, conveyed to the jetty head and loaded onto the TSV at a 700tph rate. The TSV will transport product 15 nautical miles (28km) offshore to ocean-going vessels (OGVs) at anchor

Figure 4: Port and Transhipper

Port and Transhipper new

BCI is planning to ship salt to customers in OGVs ranging from Supramax (50,000dwt) to Capesize (160,000 dwt). The use of larger average OGVs will reduce overall freight costs materially compared with other WA salt operations with berth constraints. SOP can be shipped by either small vessels or together with salt shipments, where the products have customers with a common or nearby port.

A Final Investment Decision was made for the Mardie Project in October 2021. BCI is finalising the funding, approvals and tenure required to commence Main Construction in early 2022, which will allow first salt sales to be achieved by Q4 2024 and first SOP sales by Q1 2026. On 18 November 2021, BCI announced a $360m capital raising to provide a key project funding component, subject to shareholder approval.

With attractive financial returns over many decades and expansion potential from the new tenements, development of the Mardie Project should result in considerable long-term value and dividends being created for shareholders.

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