References
ULRIKSEN G., C., MAPA METALOGENICA DE CHILE, BOLETIN NO. 42,1990, #24, P.40.MINING JOURNAL, 5/92, P.20.MINING ENGINEERING, 4/92, P.308.AMERICAN METAL MARKET, 5/20/92, P.1.ENGINEERING AND MINING JOURNAL, 7/92, P.24.METALS WEEK, 7/20/92, P.9.MINING JOURNAL, 2/12/93, P.113.LATIN AMERICAN MINING LETTER, 7/31/92, P.4.METALS WEEK, 4/19/93, P.4,5.MINING JOURNAL, 4/30/93, P.305,306.METAL BULLETIN, 5/3/93, P.5.LATIN AMERICAN MINING LETTER, 4/29/93, P.1,2.LATIN AMERICAN MINING LETTER, 7/9/93, P.3,4.METALS WEEK, 5/3/93, P.7.METAL BULLETIN, 7/1/93, P.9.MINING JOURNAL, 7/9/93, P.22.LATIN AMERICAN MINING LETTER, 9/30/93, P.3.LATIN AMERICAN MINING LETTER, 11/15/93, P.8.METALS WEEK, 9/27/93, P.2.METALS WEEK, 1/10/94, P.7.MINING MAGAZINE, 11/93, P.278.METALS WEEK, 4/18/94, P.6.METALS WEEK, 8/8/94, P.3.LATIN AMERICAN MINING LETTER, 8/15/94, P.8.MINING MAGAZINE, 9/90, P.158,160.LATIN AMERICAN MINING LETTER, 2/12/93, P.2, VOL.12, NO.1.MINING MAGAZINE, 1/94, P.28.