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Mason Graphite Commissions Its Pilot Plant for Li-Ion Batteries

Press Release

MONTREAL, May 21, 2019 — Mason Graphite Inc. (“Mason Graphite” or “the Company”) (TSX.V: LLG; OTCQX: MGPHF) is pleased to announce the commissioning of its Li-ion battery materials pilot plant and provides an update with respect to recent activities of its Value-Added Products (“VAP”).

In parallel with the Lac Guéret Project, Mason Graphite continues to advance its highly strategic coated spherical graphite project for Li-ion batteries, and since the beginning of 2019, new milestones have been achieved on this project.

An integrated operation

The future coated spherical graphite and VAP plant (2nd transformation) would be connected to the concentrator (1sttransformation) located in Baie-Comeau and would be fed with the concentrate produced by the latter. Mason Graphite would thus be fully integrated, from the mine site to coated spherical graphite, thus serving the international Li-ion battery market from its operations in Quebec. Once these operations are completed, Mason Graphite would be the North American leader, and a major international player, in the supply chain of transportation electrification and energy storage, two markets that, according to several independent research firms, such as Industrial Minerals and Benchmark Mineral Intelligence, have potentially high growth prospects.

The technical and economic study on the VAP

Mason Graphite has started a technical and economic study on the future VAP plant. This study, which will be spread over several months, aims to industrialize VAP processes, maximize reuse of reagents and define effluent treatment needs. The preliminary engineering will be carried out, allowing the investment and operation costs to be evaluated with an accuracy of ± 25% and then to confirm the profitability of the project. This study will be produced by our internal resources and long-standing external partners Soutex and BBA.

Pilot plant, scaling and process reproducibility

The Company is pleased to announce the recent commissioning of its brand-new pilot plant for micronisation, spheronisation and classification. This pilot plant, located in the Quebec City region, will be used to produce spherical graphite samples in large quantities for potential customers with whom the Company is in discussions. This plant will significantly reduce sample delivery times and tailor product specifications to users’ highly diverse specifications. Photos of this pilot plant are available at

To supply this pilot plant, 350 kg of 99.95% purified graphite has been produced at COREM facilities in the last few months and another 500 kg batch is being prepared. These products were developed from fine concentrates generated during a pilot run in winter 2018 with ore from the Lac Guéret deposit, which generated several tons of concentrate.

In addition, two new batches of 30 kg each of coated spherical graphite, meeting the very stringent requirements of Li-ion batteries for electric vehicles, have recently been produced. These new results demonstrate once again the efficiency and reproducibility of purification, micronisation, spheronisation, classification and coating processes developed to treat the Lac Guéret graphite.

The scaling of the various process steps is progressing smoothly, with the successful pilot scale transition to alkaline melting, aqueous leaching and final coating at COREM. Acid leaching had already passed successfully on a pilot scale in October 2018.

Consent of the Qualified Person

Jean L’Heureux, Eng., M. Eng., Executive Vice President, Process Development for Mason Graphite, and a Qualified Person, as defined by NI 43-101 for Mason Graphite, was responsible for the audit of data presented in this press release and read and approved.

About Mason Graphite and the Lac Guéret Project

Mason Graphite is a Canadian mining and processing company focused on the development of its 100% owned Lac Guéret natural graphite deposit located in northeastern Québec. The Company is led by a highly experienced team that has over five decades of experience in graphite production, sales, and research and development. For more information, visit

Mason Graphite Inc. On Behalf of the Board

“Benoît Gascon, CPA, CA”, President & Chief Executive Officer

For more Information:
Simon Marcotte, CFA, Director Corporate Development at +1 (647) 801-7273 and at

For more information relating to local communities:
+1 (514) 289-3582 and at

Head Office: 3030, boulevard Le Carrefour, bureau 600, Laval, Québec, H7T 2P5



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