ECONOMIC GEOLOGY, 2000, V 95, N 7, November.

Preliminary Fluid Inclusion Constraints on Fluid Evolution in the Bayan Obo
Fe-REE-Nb Deposit, Inner Mongolia, China
Martin P. Smith and P. Henderson
1371

Regional Fluid Flow and Gold Mineralization in the Dalradian of the Sperrin
Mountains, Northern Ireland
J. Parnell, G. Earls, J. J. Wilkinson, D. H. W. Hutton, A. J. Boyce, A. E.
Fallick, R. M. Ellam, S. A. Gleeson, N. R. Moles, P. F. Carey, and I. Legg
1389

Dike-Hosted Ores of the Beast Deposit and the Importance of Eocene
Magmatism in Gold Mineralization of the Carlin Trend,Nevada
Michael W. Ressel, Donald C. Noble, Christopher D. Henry, and Wayne S.Trudel
1417

Porphyry Gold Deposits of the Refugio District, Maricunga Belt, Northern Chile
John L. Muntean and Marco T. Einaudi
1445

The Middle Valley Sulfide Deposits, Northern Juan de Fuca Ridge: Radiogenic
Isotope Systematics
T. Bjerkgård, B. L. Cousens, and J. M. Franklin
1473

Age of the Sherman-Type Zn-Pb-Ag Deposits, Mosquito Range,Colorado
D. T. A. Symons, M. T. Lewchuk, C. F. Taylor, and M. J. Harris
1489

Fluid Chemistry and Depositional Mechanism of the Epigenetic, Discordant
Ores of the Proterozoic Carbonate-Hosted, Zawarmala Pb-Zn Deposit, Udaipur
District, India
Jawahar Kumar Talluri, H. S. Pandalai and G. N. Jadhav
1505

Scientific Communications

Contrasting Fluid Types at the Nevoria Gold Deposit in the Southern Cross
Greenstone Belt, Western Australia: Implications of Auriferous Fluids
Depositing Ores within an Archean Banded Iron-Formation
Hong-Rui Fan, David I. Groves, Edward J. Mickucki, and Neal J. McNaughton
1527

Re-Os Ages for the Erdenet and Tsagaan Suvarga Porphyry Cu-Mo Deposits,
Mongolia, and Tectonic Implications
Yasushi Watanabe and Holly J. Stein 
1537

The Relationship between Intrusion-Hosted Cu-Mo Mineralization and the VMS
Deposits of the Archean Sturgeon Lake Mining Camp, Northwestern Ontario
Alan Galley, Otto van Breemen, and James Franklin
1543

Experimental Sulfur Isotope Studies of the Pyrite to Pyrrhotite Conversion
in a Hydrogen Atmosphere
Edward M. Ripley and Kossouth Snyder
1551