U.S. futures exchange CME Group Inc is considering introducing daily limits on price moves in gold and silver futures in a bid to rein in wild volatility that has spooked investors in recent years, a CME official said on Tuesday.

CME at present has price fluctuation limits for futures contracts in some energy, agricultural commodities, and financial products, but none for its precious and base metal products.

The possible move reflects growing concern at the largest U.S. exchange of futures and options about big bouts of buying or selling that have caused huge fluctuations in prices without any apparent fundamental reason.