
Dr. Maria Kalashnikova, D.Sc.
Independent Metallurgy Consultant | Technical Due Diligence & Feasibility Review for Investment Funds & EPCM | Hydrometallurgical Flowsheet Design, Optimization & Commissioning
Advanced Hydrometallurgy & Base Metals Extraction
Providing independent technical due diligence, flowsheet optimization, and expert operational risk assessment for global mining, EPCM, and investment majors.
Independent Expertise for Capital-Intensive Industrial Projects.
I am an independent metallurgy & industrial consultant — not a vendor, not part of an EPCM team, not affiliated with any operator. My clients hire me directly when they need a senior, second-opinion technical authority on a defined scope: feasibility review, flowsheet audit, due diligence, or proprietary process design.
Based in Israel and working independently since 2014, I combined contract-based international engagements with leading the hydrometallurgy laboratory at the Gipronickel Institute (St. Petersburg) until January 2025, when I concluded that role to consult full-time. I hold no current employment, equity, or contractual obligations with any mining operator, and I operate under strict confidentiality discipline: client-specific information from past engagements is never disclosed.
Forty years of bench-to-plant practice — including tenure as Head of a premier Hydrometallurgy Laboratory — sit behind every engagement. Operating globally from Israel, I deliver independent technical review at the depth required for NI 43-101 / JORC reporting, alongside my own portfolio of 11 issued Russian Federation patents and a registered APC software algorithm (2025) — proprietary solutions that travel with me, not with any single employer.

Three Pillars of Independent Technical Authority.
Technical Due Diligence
Auditing metallurgical test-work, pilot plant data, and feasibility studies to mitigate investor risks.
Flowsheet Optimization
Troubleshooting acute operational bottlenecks in High-Pressure Acid Leaching (HPAL), Pressure Oxidation (POX), and matte conversion.
Digital Metallurgy (APC)
Translating physical chemistry into Advanced Process Control algorithms and automated industrial parameters.
Selected Client Projects & Independent Engagements.
Contract-based expert assessment, feasibility review and flowsheet auditing delivered for external clients — mining operators, financiers, and EPCM firms — under independent terms of reference.
- 2014–2015 · Fenix Nickel Project · Guatemala · client confidentialIndependent audit of the Hatch nickel-laterite scoping study (~$500M CAPEX)
Engaged under consulting contract as Independent Technical Reviewer. Audited the Hatch scoping study (completed 2015) and reviewed SGS metallurgical test-work campaigns (2008 and 2013); stress-tested acid-consumption, recovery and scaling assumptions; surfaced 6 critical operational and commercial risks — Magnesia Recovery, Residue Stability, Ocean Outfall Pipeline, Scaling of the Ocean Outfall Pipeline, Power Plant Availability, Cost of Sulphur. Findings informed the owner's decision not to advance the HPAL route to feasibility.
- Client: BHP Billiton (Australia)Precipitation Advisory — Laterite Leach Solutions
Engaged as external expert to engineer and evaluate alternative selective precipitation routes for nickel-cobalt laterite leach solutions, with the goal of optimizing downstream refinery efficiency.
- 2008–2015 · Nornickel Harjavalta (Finland) & Norilsk Nickel Polar DivisionAutoclave refining of copper-nickel matte in sulfate media
Developed and evaluated process options for autoclave (pressure) refining of copper-nickel matte in sulfate media across multiple engagements for the Harjavalta refinery and the Polar Division — technical reports and process recommendations supporting refinery flowsheet decisions.
- Institutional Client Engagement · Kola MMCKola High-Grade Nickel Operations
Long-running institutional R&D advisory for Kola MMC: complex variant processing simulations for high-grade nickel facilities with nominal outputs ranging from 125,000 to 170,000 metric tons per annum.
Author’s Developments — Solutions That Travel With Me.
Proprietary processes, flowsheets and control algorithms registered as my own intellectual property — independent of any single employer and available for licensing, joint development or transfer-of-know-how engagements.
Advanced Process Control Algorithm — Iron Removal from Nickel Solutions
Proprietary mathematical algorithm calculating real-time control actions for the iron-removal stage in nickel-solution refining, radically minimising base-metal losses. Co-developed and registered as my own intellectual property.
Non-Toxic Cu / Ni / Co Sulfide Precipitation from Sulfate Solutions
Authored method for selective precipitation of nickel, cobalt and copper as sulfides from dilute sulfate streams — replacing toxic reagents and reducing tailings load. Independently licensable IP, applied in BHP Billiton advisory.
Pressure-Leaching Flowsheet for Pyrrhotite-Pentlandite Concentrates
Authored advanced pressure-leaching configuration that converts low-grade sulfide pyrrhotite — previously a tailings stream — into a profitable feedstock. Unlocks 10–25% base-metal and 15–30% PGM recovery gains depending on feed.
Custom Flowsheets for Refractory Polymetallic & Pb-Zn Concentrates
Authored specialised chemical parameters and atmospheric / pressure flowsheets for ultra-low-grade laterites and complex Pb-Zn concentrates unsuited to conventional smelting routes — bypassing pyrometallurgical limits.
Patented Processes. Productionised Algorithms.
Four decades of bench-to-plant practice now extending into Industry 4.0 — turning empirical chemistry into governed control logic for modern refineries. All processes below are registered as my own intellectual property and are not bound to any single operator or employer.
11 issued Russian Federation patents covering selective sulfide precipitation, pressure leaching of pyrrhotite-pentlandite concentrates, and autoclave-process flowsheets.
Advanced Process Control (APC) Software IP (Registered 2025): Co-developer of a proprietary mathematical algorithm designed for calculating real-time control actions during complex iron removal processes from nickel solutions, radically minimizing base metal losses.
- Advanced Process Control (APC) Algorithm — Method of Calculating Control Actions for Iron Purification. State Registration No. 2025665318, 2025.
- Patent RU 2573306 — Processing sulfide pyrrhotite-pentlandite concentrates containing precious metals.
- Patent RU 2328537 — Selective precipitation of nickel, cobalt, and copper from sulfate solutions.
Peer-Reviewed & Symposium Record.
Author of three fundamental textbooks and 18 peer-reviewed and international symposium papers on the hydrometallurgy of non-ferrous metals. Featured entries below; full record on the dedicated page.
View full Publications & Patents- 01Klimenko I.V., Greyver M.B., Kalashnikova M.I., Vostrikova N.M.
Influence of Various Factors on Iron Oxidation in Highly Concentrated Chloride Nickel Solutions
Tsvetnye Metally (Non-Ferrous Metals)2024, №10, pp. 47–54 - 02Kalashnikova M.I., Tsymbulov L.B., Naboychenko S.S., Kolmachikhina O.B.
Promising Directions for the Processing of Oxidized Nickel Ores (Laterites) Applicable to Ural Deposits
Tsvetnye Metally (Non-Ferrous Metals)2019, №8, pp. 4–10 - 03Petrov G.V., Kalashnikova M.I., Fokina S.B.
Regularities of Selenium and Chromium Behavior in Redox Processes During Hydrometallurgical Treatment of Solid-Phase Products of Rhenium Extraction
Notes of the Mining Institute (PMI)2016, Vol. 220, pp. 601–606 - 04Saltykov P.M., Kalashnikova M.I., Saltykova E.G., Trubina O.A., Kotukhov S.B.
Hydrometallurgical processing of nickel sulphide concentrates from Australian deposits
Tsvetnye Metally (Non-Ferrous Metals)2014, №9, pp. 68–75 - 05Sizyakov V.M., Dubovikov O.A., Nikolaeva N.V., Kalashnikova M.I.
The role of mineralized additives in the alumina phase transformation process
Journal of Mining Institute2013, Vol. 202, pp. 48–55 - 06Volkov L.V., Kalashnikova M.I., Shneerson Ya.M.
The behaviour of copper during the dissolution of metallic nickel in CuSO₄ solutions
Copper / Cobre 2007, John E. Dutrizac Symposium on Copper Hydrometallurgy, Toronto, Canada2007, pp. 333–343 - 07Kalashnikova M.I., Shneerson Ya.M., Keskinova M.V., Chetvertakov V.V.
Non-Traditional Methods of Heavy Metals Precipitation from Solution in the Form of Sulfide
Sohn International Symposium, San Diego, USA2006, pp. 555–561 - 08Kalashnikova M.I., Shneerson Ya.M., Keskinova M.V.
Interactions of ferriferous copper-nickel mattes with sulphuric acid: study of chemistry and kinetics
Pressure Hydrometallurgy 2004, Alberta, Canada2004, pp. 887–898