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Rio Tinto Group, the world’s second-largest mining company, is focused as much on driver-less trucks and automated drills as conventional shovels and loaders these days. That means it needs a whole lot more high-tech workers.

Caterpillar Inc., the iconic American machinery maker, is finally emerging from a four-year slump, thanks in part to China.

Ample used construction-equipment supplies and restrained spending from miners mean the commodities rebound won’t be giving much of a lift to beleaguered Caterpillar Inc., which forecast 2017 results that trailed analysts’ estimates. The shares fell.