Anil Agarwal’s surprise move into Anglo American Plc suggests the mining industry may be on the cusp of a new wave of deals. For years, Anglo has been the subject of takeover speculation and during the worst of the commodities crisis it seemed on the verge of a breakup. It spent last year getting back on firmer footing, but the 2 billion pound ($2.4 billion) investment by one-time Anglo suitor Agarwal has sparked the return of speculation about the company’s future. “I’m pretty sure every investment banker in London is running around, dusting off old pitch books and going to...