Knob Hill Mine & Plant

WASHINGTON DEPT. OF ECOLOGY TOXIC CLEANUP PROGRAM. AFFECTEDMEDIA AND CONTAMINATION REPORT, APR. 7, 1993.MINING JOURNAL-PRESS. REPUBLIC WASHINGTON NEEDS CAPITAL.VOL. 119, NO.9.COLVILLE ENG CO, FERRY COUNTY POWER SURVEY, FERRY CO PUD RPTPP 87-91.BOM INFORMATION CIRCULAS #48, P16.QUARTER RESULTS. AUG 5, 1981, P. 3.ENGINEERING AND MINING JOURNAL. KNOB HILL MINE PROSPERS ONNEWER ORE DISCOVERIES. MARCH 1948, P. 56-59.COOPER, CORWIN L. MINING AND MILLING METHODS AND COSTS ATKNOB HILL MINE. BUMINES IC 7123, JUNE 1940, 29 P.THE MINING RECORD.HECLA AND DAY MERGER-PREMIER SILVER MININGCOMPANY. DEC. 16, 1981, P. 7.THE MINING RECORD, LUCKY FRIDAY TOP GOLD PRODUCER. NOV 3,1982.THE MINING RECORD. THE REPUBLIC PM DISTRICT, WA. MAR 23,1983THE MINING RECORD. HECLAS MINING REPORTS LOSS FOR SECONDHECLA MINING COMPANY-ANNUAL REPORT, 1980.HECLA MINING COMPANY-ANNUAL REPORT, 1981.HECLA MINING COMPANY 1995 ANNUAL REPORT, P15.STATE OF WASHINGTON BUL. 37, PART 2, P 124.GOLD EXTRACTION COST $160/OZ, SPOKESMAN-REVIEW P.C1,1/11/871986 PRODUCTION 40000 OZ AU, S-R P.C1, 1/11/87.GOLDEN PROMISE SHAFT IS 1300 FT DEEP,TOOK 8 MONTHS TO SINK,AND COST $2.2 MILLION , S-R P.C1, 1/11/87.THROUGH 1985 4.3 MILLION ST OF ORE MINED, AT 0.557 OZ AU/ST,AND 3.23 OZ AG/ST, WALLACE MINER P.3, 12/18/86.RANDOL MINING DIRECTORY, 1996/97, P326.