| References: |
- Deposit:: STAFF, 1978 ENGINEERING AND MINING JOURNAL INTERNATIONAL
- Deposit:: DIRECTORY OF MINING, 1978, P. 276.
- Deposit:: A BAN ON SCHEELITE ORE EXPORTS, ENGINEERING AND MINING
- Deposit:: JOURNAL, SEPT. 1977, P. 44.
- Deposit:: LEFOND, S. J., BRAZILIAN MINING: RELAXED GO*. ATTITUDES
- Deposit:: PAVE THE WAY FOR EXPLOITING CRITICAL RESERVES, MINING
- Deposit:: ENGINEERING, NOV. 1973, P. 44.
- Deposit:: STAFF, MINING MAGAZINE, JAN. 1979, P. 55.
- Deposit:: YIH, STEPHEN W.H. AND WANG, CHUN T.; TUNGSTEN: SOURCES,
- Deposit:: METALLURGY, PROPERTIES, AND APPLICATIONS., PLENUM PRESS
- Deposit:: NEW YORK, 1979. P 47.
- Deposit:: ROSKILL INFORMATION SERVICES LTD., THE ECONOMICS OF TUNGSTEN
- Deposit:: *H EDITION 1990. P 55.
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