Canada's main stock index topped 30,000 for the first time as strength in the energy and base metal sectors helped it climb into record territory, while U.S. stock markets were mixed in late-morning trading on Tuesday.

The S&P/TSX composite index surpassed 30,000 at some points in early trading, before dipping back down. As of 11 a.m. ET, the index was hovering just above that mark.

In New York, the Dow Jones industrial average was up 66.27 points at 46,381.54. The S&P 500 index was up 29.39 points at 6,693.75, while the Nasdaq composite was up 157.50 points at 22,788.98.

Shares in chipmaker Nvidia soared 3.9 per cent after it announced it will invest $100 billion US in OpenAI, owner of the artificial intelligence chatbot ChatGPT. The partnership is to add at least 10 gigawatts of Nvidi

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