BacTech Environmental Corporation (CSE: BAC | OTCQB: BCCEF) has filed an Australian provisional patent application for a four-step process that recovers iron sulphate crystals, sulphuric acid, and valuable metals from acidic, iron-rich mine water — waste streams that the industry currently neutralises with limestone and buries as sludge. The filing, titled "A Process for Producing Concentrated Iron and Acid Streams from an Acidic Ferric Iron Containing Solution," secures BacTech's priority date for the invention. The company now has 12 months to convert the provisional filing into a full patent application. Investors may be watching closely given the potential to commercialise an output that currently represents a significant industry liability.

Key Points

  • BacTech Environmental Corporation (CSE: BAC | OTCQB: BCCEF) announced the provisional patent filing on October 20, 2026
  • The process targets acidic, iron-laden water from sulphide ore processing, bioleaching, tailings, and acid mine drainage
  • The filing states treating one tonne of dissolved iron via the conventional limestone method generates roughly eight tonnes of sludge and consumes approximately five tonnes of limestone
  • Investors should watch whether BacTech files a full patent application within the 12-month window and advances the process toward commercial-scale demonstration

The Limestone Problem BacTech's Patent Aims to Solve

The conventional treatment for acidic, iron-rich mine water is to neutralise it with crushed limestone, producing large volumes of sludge that must be stored and monitored indefinitely. According to the filing, treating one tonne of dissolved iron this way consumes approximately five tonnes of limestone and generates roughly eight tonnes of sludge plus another eight tonnes of water trapped within it. Valuable iron, acid, and trace metals are discarded in the process, and arsenic — where present — is diluted across a bulky low-grade waste rather than being concentrated into a manageable form.

How BacTech's Four-Step Recovery Process Works

The patented process first converts reactive iron into a more stable dissolved form using a gas treatment, which also generates additional acid. A second step causes copper, zinc, arsenic, and other metals — including critical minerals such as indium, gallium, germanium, scandium, and rare earths — to precipitate as recoverable solids while iron remains in solution. Specialised membranes and crystallisation then separate clean iron sulphate crystals from concentrated sulphuric acid. Arsenic is concentrated into a compact, stable mineral form. The release states iron losses during the cleaning steps are expected to be only approximately one to three per cent.

Revenue Potential From Iron Sulphate, Acid, and Critical Minerals

BacTech identifies established markets for iron sulphate crystals in water treatment, cement, fertiliser, animal feed, and pigments. Recovered sulphuric acid can be reused on-site or supplied to copper and uranium operations where acid is a primary reagent cost, and supply is described as tight in landlocked regions. The filing states one worked example raises acid strength roughly twentyfold. The release also notes the process is applicable to large zinc-industry stockpiles of jarosite and zinc ferrite, potentially converting long-term environmental liabilities into productive resources.

BacTech's Zero-Tailings™ Technology and Strategic Fit

BacTech positions this patent as a complement to its existing bioleaching operations under its patent-pending Zero-Tailings™ technology, which uses naturally occurring bacteria to recover metals while stabilising harmful elements such as arsenic. Vice-President Technology Dr. Paul Miller stated in the release that bioleaching produces exactly the types of acidic, iron-rich streams the new process is designed to treat. The company trades on the CSE, OTCQB, and Frankfurt Stock Exchange. The immediate share price impact was not clear from available public information.