CANADIAN gold-mining company Barrick Gold, the world’s number two producer, announced on Tuesday plans to invest $280-million in a new site in Tanzania. Production will begin in early 2001 at the Bulyanhulu mine, whose site was acquired by Barrick when it took over Vancouver-based Sutton Resources in March. “We see Bulyanhulu making a strong contribution to production, earnings and cash flow from the very start,” said Randall Oliphant, president of Barrick. The mine is expected to yield 400000 ounces of gold at $130 an ounce during its estimated 15-year life.