US EditionInvestor’s case against mining firm over timely disclosure can proceed: Supreme Court
The Supreme Court ruled an investor's lawsuit can proceed over delayed disclosure of a mining setback that caused a 16% drop in Lundin Mining's stock price.
- On Nov. 28, 2025, the Supreme Court of Canada allowed an investor's action over delayed disclosure to proceed in an 8-1 ruling.
- Just days after detecting pit wall instability, Lundin Mining Corp. shut part of its Chile open-pit mine in October 2017 and delayed a scheduled update lowering 2018 copper forecasts.
- The day after the update, Lundin's securities fell 16 per cent on the Toronto Stock Exchange, while Ontario law requires disclosure of material changes 'without delay' and permits courts to grant leave if claims are made in good faith.
- Writing for the majority, Justice Mahmud Jamal said disclosure promotes capital‑market efficiency and said the motion judge erred by applying restrictive definitions, noting key terms allow flexible application.
- The appellate path has returned class‑certification questions to the lower court after the Ontario Superior Court of Justice dismissed the motion but the Ontario Court of Appeal overturned that decision.
32 Articles
32 Articles
Midland Today
Investor's case against mining firm over timely disclosure can proceed: Supreme Court
OTTAWA — The Supreme Court of Canada says an investor can pursue legal action against a mining company on the basis that it did not immediately publicize information about a production setback.
Supreme Court says investor's action against mining company can proceed
OTTAWA — The Supreme Court of Canada says an investor's legal action against a mining company over its decision not to immediately publicize information about a production setback can proceed. Just days after Canadian firm Lundin Mining Corp.
Supreme Court says investor's action against mining company can proceed
OTTAWA — The Supreme Court of Canada says an investor's legal action against a mining company over its decision not to immediately publicize information about a production setback can proceed. Just days after Canadian firm Lundin Mining Corp.
Supreme Court says investor's action against mining company can proceed
OTTAWA — The Supreme Court of Canada says an investor’s legal action against a mining company over its decision not to immediately publicize information about a production setback can proceed. Just days after Canadian firm Lundin Mining Corp. detected wall instability at its open-pit mine in Chile in October 2017, a rock slide prompted the […]
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