Platinum futures rose above $1,870 an ounce to an 11-week high as a weaker U.S. dollar and renewed demand for precious metals lifted the market. The dollar faced pressure from concerns about the U.S. fiscal outlook and skepticism that the Treasury's expanded bond-buyback program would offer a lasting solution to elevated borrowing costs. Lower yields earlier in the week increased demand for non-yielding assets, while expectations that the Federal Reserve (U.S. central bank) could leave interest rates unchanged in September provided additional support. Platinum also benefited from persistent global supply deficits and low inventories, which limited available metal. Geopolitical tensions in the Middle East and elevated oil prices added inflation and economic uncertainty, encouraging demand for precious metals as a hedge.