RIYADH: Gold edged lower on Tuesday due to a slightly stronger dollar, but prices were stuck in a tight range as investors refrained from making big bets ahead of key central bank meetings. Spot gold was down 0.1 percent at $1,707.29 per ounce, as of 0313 GMT. US gold futures fell 0.3 percent to $1,705.10. Silver falls Spot silver fell 0.3 percent to $18.61 per ounce, while platinum slipped 0.6 percent to $857.40. Palladium climbed 1.2 percent to $1,877.89. Grains lose ground Chicago corn futures lost ground on Tuesday with prices under pressure after a weekly report showed the condition of the US crop is stabilizing in its key phase of development, easing concerns over global supplies. Wheat lost ground after a strong rally, although concerns about Black Sea supplies provided a floor under the market. The most-active corn contract on the Chicago Board of Trade lost 1.2 percent to $6.03-1/4 a bushel, as of 0413 GMT, and soybeans gave up 0.7 percent to $13.70-1/4 a bushel. Wheat fell 0.5 percent to $8.09 a bushel. London copper falls on weak demand outlook London copper prices fell on Tuesday, weighed by a firm dollar and fear of softening demand amid disappointing data from the US. Three-month copper on the London Metal Exchange fell 1.8 percent to $7,292 a ton by 0144 GMT. (With input from Reuters)