CORRECTED-HECLA <HL> TO BUY MINE STAKE FROM BP Hecla Minging Co said it has agreed to purchase a 28 pct interest in the Greens Creek Joint Venture from British Petroleum Co PLC's <BP> Amselco Minerals Inc unit. The venture expects to bring into production a gold-silver-lead-zinc ore body on Admiralty Island, Alaska, containing about 3,500,000 short tons of ore assaying about 0.18 ounce of gold, 24.0 ounces of silver, 9.7 pct zinc and 3.9 pct lead per short ton, Hecla said. It said there is significant potential for the discovery of additional ore. Corrects last assay result to lead from zinc.