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.

In its 8-1 decision Friday, the top court provided guidance on determination of a “material change” in a firm’s operations that must be disclosed in a timely way under Ontario’s securities law.

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 company to shut down part of the mine.

Lundin did not publicly disclose the events at the time but advised investors in a scheduled update about a month later.

The news release described the events and said the company was lowering its copper production forec

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