Comex gold futures prices ended higher and hit a fresh four-week high Thursday, on safe-haven investment demand due to Middle East tensions. Meantime, Comex silver futures rallied to a new 30-year high on building bullish technical momentum. Comex April gold last traded up $9.20 at $1,384.30 an ounce. Spot gold last traded up $8.30 at $1,384.50.