~T= Other Types. A few, small, non-commercial deposits of cinna- bar were observed in relatively massive,: non-calcareous, sedimentary rocks. In these the cinnabar occurs in’ stringers of dolomite at or near the contacts:of sills or dykes, these contacts Bone as CoeC leone for the mineralizing solutions . : Arquerite, an amalgom of mercury and silver containing 86,6 per cent silver, has been panned on most of the creeks in eghe area» Origin of the Cinnabar Deposits. Schuette! has Corneal, out lgchuette, Geena The. Geolory of Quicksilver Ore Deposits; Calif. Jour. Mines and Geol., No. 1, vol. 33, pe 49. that mercury déposits are usually found under a cap rock or gouge more dense than the receptaele rock in whith the ore forms. In many places along the Pinchi fault zone relatively impervious cap roek and fault gouge have acted as traps to rising mercury-bearing solutions and have induced concentrations of cinnabar. At the Pinchi Lake méroury mine © the larger cinnabar deposits are in limestone overlain by &chists. More . detailed underground study may, reveal similar conditions in other de- posits. Although "trapping" is undoubtedly an important factor in lo- calizing ore, the relative Per DEL Uy, of Seheels channels is of equal or greater importance. No genetic relationship is apparent between the: mercury deposits and any nearby volcanic or intrusive rocks. The source of the ore- forming solutions is not: known, but is’ probably connected with some deep-seated intrusion. The Pinchi fault zone provided obundant channel- ways for mineralizing solutions, ‘and deposition occurred wherever other conditions were favourable. In many mercury deposits there is evidence to indicate. that cinnabar is precipitated at temperatures varying between: 100 and 150 degrees centigrade;’ at nearly atmospheric pressures; and from mineral-bearing alkaline solutions. Chemical analyses of the Pinthi Lake mercury mine limestones show a considerable increase in sodium and potas- sium where they have been mineralized with cinnabar’. “Geol. Surya, Genada, Paper 42-11, p. 9. Presumably the mercury deposits of the Pinchi Lake belt formed in Tertiary time as they are later than the faulting, and faulting has involved all the rocks in the area except those of Pleistocene and Recent age ° Other Deposits A vein of braunite (manganese silicate) and-psilomelane (man- ganese oxide) occurs in Permian limestone about 1.mile west of the south end of Indata Lake. The seam: varies from a few inches.to 2 ook wide and has been traced 48 60 feet. Placer gold fe been recovered from Vital, Harrison, Silver, Kenny, Kwanika, Tom, and Quartz Creeks. At no time has the recovery been large, but it has been sufficient to sustain interest in tog placer possibilities of the area for the past 75 years. :