Stratigraphic Notes from the Iskut-sulphurets Projec’t Area

The list of published geological reports on the IskutSulphurc& gold camp continues to grow. The regional geologic framework has been prcsentcd by Anderwn (IYXY), Anderson and Thorkelson (IYYO) and Anderson and Bevier (1990). The geology and mineralization of the Sulphurets, Unuk and Snippaker areas have been described in maps and repwts by Alldrick and Britton ( 1988). Alldrick rf ul. (IYXY, IYYO), Britton and Alldrick (198X), Britton ef N/. (IYXY, IYYOb). Maps and reports “f contiguous areas include Alldrick (19X.5, 1987). Read erol. (1989) and Logan cf r/l. (1990;~. b). There are detailed geologic maps of the Brr)nson Creek Johnny Mountain area by Lcfrbure and Gunning (IYXY) and Fletcher and Hiehert (1990). Published mineral deposit descriptions include the E&L nickel prospect (Hancock. 1990). the Colagh prospect (MacLean. 1990). the recent dixovcries at Eskay Creek (Britton er ol., lY90a). and skarns (Ray and Webster, 199 I, this volume). New galcna-lead isotope data from many deposits of this region alp plesentcrl in Godwin rf ul. (I 99 I. this wlume). In addition t” these reports are rock and streawsediment geochemicul data (Lefehure and Gunning. 19X8. 1989; National Geochemical Reconnaissance. IYXX). MINFILE descriptions “f 360 mineral occurrences, and more than 22.5 assessmtwt reports now in the public domain. The Ge”l”gical Survey of Canada will continue rcgionel mapping “I’ the lskut River shcel (1048) under the direction of R.G Anderson. In July, IYYO the recently established Mineral &posit Research Unit began studies of the major mineral deposits in the Iskur-Sulphurcts camp, including Sulphurets, Kerr. Eskay Creek, Snip and Johnny Mountain. Our IYYO field area cntended fmm Mwnt Vcrrett in the northwest f” MoQuillan Ridge in the southeast. mainly between Snippiker and Harrymel creeks (Figure I-13-2). This area had been only briefly reconnoitrcd in lY88 and IYXY and there remained the task of correlating our units with those of adjacent map areas (Read <‘I u/.. IYXY: Logan rf d, lYY0b). STRATIGRAPHIC NOMENCLATURE