THE ERIE LAKE AREA , WITH EMPHASIS ON STRATIGRAPHY AND STRUCTURE OF THE HALL FORMATION , SOUTHEASTERN BRITISH COLU ~ MBIA ( 82 F / 3 W ) By

Regional mapping and mineral deposit studies have been carried out in the Rossland Group since lY87. The aim 01 the project is to develop ;I better understanding of the stratigraphic and structurill setting of the Rossland Group and to assess controls on mineraliz,ation within it. The project includes systematic whole-rock and trxc element analyses of volcanic rocks. uraniutwlead dating of intrusi\‘e rocks and Elise volcanic rocks, and fluid inclusion, stabla and radiogenic isotope studies of mineral occurrences. During the I990 field sewon. I:20 OOO-scale regional mapping was completed in both the Salmo and Rosslend map areas (Figure I 1~ I ). The Salmo mapping ties together previous work in the Nelson map xca to the north (Hay and Andrew, IY89h) and in the Mount Kelly Hellroaring Creek and Beaver Creek areas to the south (Hiiy and Andrew, IY9Ob, hndrcw of ui., IYYOa, b). Previous to this study, the stru~t~rzal tie between the Nelson and Salmo map sheets was unre%,lved. Special emphsis is given to the distribution. facie\ changes and contact relationships of the Hall Formation in both the Salmo and Nelson map areas. Previous regional mapping of the Rosslu~d Group in the Erie Lake area has been by Little (1960, 1965). Fitzpatrick (1985). Mulligan (IYSI, 1952) and Walker (1934). Petrologic and geochemicnl studies <of the Elise Formation have been undertaken hy Beddoe-Stephens ;md Lamberr (IYXI) and Beddoe-Stephens (19X?).