Fresnillo’s profit plunged by more than two-thirds in the first half of the year, hit by a drop in production and higher costs, the silver and gold miner said on Tuesday as it cut its capital spending budget for the year. "Continued challenges at our Fresnillo, Saucito and Herradura mines, combined with higher costs, have impacted profitability for the period," Chief Executive Officer Octavio AlvĂdrez said in a statement.