Bulletin

adit anticline argillaceous argillite assayed barite Bear Gulch beds biotite British Columbia Butte calcareous chalcopyrite coal containing Creek deposits Developing dike dips dolomite east feet Flathead flow Formation galena glacial Gneiss gold Gouge gravel grey High Ridge inches interbedded iron oxides Kalispell Kootenai River Lake land lease Libby light-grey limestone Lincoln County lode lower adit Madison County magnetite map area miles mineral mining claim Missoula Missoula Group Montana Bureau Montana Owner Montana Status Mountain north Yaak River northeast northwest faults NW sec occur operator Status ounce silver outcrop percent copper person Piegan Piegan Group placer plagioclase Pony Gneiss portal Precambrian Prichard production prospect Purcell Basalt pyrite quartz vein quartzite Range Ravalli Group Richmond Group rock Rocky Mountain Trench sample sediments sericite shaft shale strata structure surface thick Tidal Wave district township trace trace tunnel unit upper Valley vein strikes Yaak River quadrangles zone