Geology and Mineralization of the Stuhini Creek Area

Regional geologic mapping in 1994 extended previous 150 000-scale mapping of the Tulsequah River mapsheet (104W12; Mihalynuk et a/.. 1994a, b) eastward into the Stuhini Creek map area (104Wl1, Figure 1). Approximately 20% of the Tulsequah River and 45% of the Stuhini Creek map sheets has been previously mapped as Upper Triassic Stuhini Group (Souther, 1971'). More recently, fossil and isotopic age data indicate that most "upper Triassic" rocks within the Tulsequah Rivrtr map area are in fact Palcozoic (Nelson and Payne; 1984; Mihalynuk et 01.. 1994a; Sherlock et a/., 1994), including rocks that host two past-producing volcanogenic massive sulphide deposits, the Big Bull and Tulsequah Chief. A primaq objective of fieldwork in 1994 was to search along strike in 104W11 for correlative Paleozoic strata. in large areas previously