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MINING JOURNAL, 10/16/87, P.310MINING JOURNAL, 10/23/87, P.330LATIN AMERICAN MINING LETTER, 10/30/87, P.4PAY DIRT, 12/87, P.12BMINING MAGAZINE, 12/87, P.523ENGINEERING AND MINING JOURNAL, 12/87, P.92ENGINEERING AND MINING JOURNAL, 4/88, P.92MINING JOURNAL, 2/17/89, P.121LATIN AMERICAN MINING LETTER, 6/16/88, P.6ENGINEERING AND MINING JOURNAL, 4/89, P.75ENGINEERING AND MINING JOURNAL, 6/92, P.24.REUSS, R.J., AND F.J. OLLIVIER, MINA MARIA: A NEW MINE INMEXICO'S OLD CANANEA DISTRICT, MINING ENGINEERING, 11/92,P.1323.COMINCO RESOURCES INTERNATIONAL LTD., 1990 ANNUAL RPT., P.1.COMINCO RESOURCES INTERNATIONAL LTD., 1992 ANNUAL RPT.,SOUTHWESTERN PAY DIRT, 4/94, P.10B.COMINCO RESOURCES INTERNATIONAL LTD., 1993 ANN. RPT., P.COMINCO LTD., 1993 ANNUAL REPORT, P.35.