OccurRRING CHIEFLY ALONG THE AXIS OF THE SYNCLINE, BUT ALSO AT OTHER STRATIGRAPHIC woHiaene, A STRING OF ULTRAMAFIC BODIES INTRUDE THE SYLVESTER GROUP INTERMITTENTLY FOR 70 Mites. THESE ARE THE McDAME InTRUSIONS. MOST HAVE BEEN CONVERTED TO SERPENTINE AND CONTAIN CHRYSOTILE ASBESTOS BUT SO FAR ONLY ONE, THE CASSIAR DEPOSIT, HAS PROVEN ECONOMIC. 8. GEQLOGY OF THE CASSIAR OREBODY a) Country Rocks THe CASSVAR MINE .1S HIGH ON THE WESTERN FLANK- OF McDAME MOUNTAIN, A HIGH SERRATED RIOGE, EIGHT MILES LONG, AT AN AVERAGE ELEVATION OF 6,600 FEET, SURMOUNTED BY PEAKS UP TO 7,000 FEET IN ELEVATION. THE UPPER SLOPES ARE PRECIPITOUS AND CONTAIN MANY GLACIAL CIRQUES. THE EASTERN EDCE OF THE CASSIAR GRANITIC BATHOLITH FOLLOWS THE CREST OF ANOTHER MOUNTAIN RANGE, ONE TO TWO MILES WEST OF THE MINE. METAMORPHOSED Proterozoic AND Lower CAMBRIAN SEDIMENTS FORM THE EASTERN SLOPES OF THIS RANGE. LiMyY ARGILLITES AND DOLOMITES OF ORDOVIGIAN ANO SILURIAN AGES UNDERLIE THE Lower sLopes OF McDAmMe MounTAIN, WHILE THE SYLVESTER GROUP OF INTERBEDDED ARGILLITES AND VOLCANICS FORM. THE UPPER PART. BoTH FORMATIONS DIP UNIFORMLY EAST INTO THE REGIONAL SYNCLINE. THE UPPERMOST UNIT OF THE SANDPILE GROUP IS A VERY PROMINENT WHITE-WEATHERING BAND OF MASSIVE BLACK DOLOMITE, EXPOSED FOR SEVERAL MILES ALONG THE MOUNTAINSIDE, EXCEPT IN THE VICINITY OF THE MINE, WHERE THE DOLOMITES ARE OVERLAIN BY LIMY BLACK ARGILLITES. THE