Hecla Mining Co - Company Profile

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Hecla Mining Co: Patents

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Publication Identifier	Document Type	Title	Classification-CPC	Publication Date
CA2599557A1	Application	IN SITU IMMOBILIZATION WITHIN DENSITY VARIANT BODIES OF WATER		April 11, 2002
US4818025A	Grant	Narrow opening mechanical miner	E21C31/10; E21D9/106; E21D9/1093	April 04, 1989
CA1057506A	Grant	METHOD OF PRODUCING METALLIC LEAD AND SILVER FROM THEIR SULFIDES	C22B13/00; C22B11/04; C22B13/04	July 03, 1979
CA1039064A	Grant	PRODUCTION OF LEAD AND SILVER FROM THEIR SULFIDES	C25C1/18; C22B13/04; Y02P10/20; C22B11/04; C25C1/20	September 26, 1978
CA1019958A	Grant	METHOD AND APPARATUS FOR RECOVERING DISSOLVED COPPER FROM ACIDIC SOLUTIONS THEREOF		November 01, 1977

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