character or cecurs in the fault breccia. Ab grontor depth (300 to 5
.€60%.).mueh.of-the high-grade ors de-found in aha aan quark: 24
chert, and schist, Southeast oF the main ues ofa)
cinuabar ‘ocours in a carbenatized and breeciat: ries (Belesenes
Similar showings have been found east of Taknt oot Lake end on eae
shore of Indata Lake. At the labtor locality the, breeciated : BONG
in dolomitized Permian limestone. ih few speeks. of, cinnchar heve been soon
in carbonatized serpentine in several other loodlitios along the Pinchi
ault zone. Several stringers of dolomite cout ining ¢ cinnaber oecur in
tho interbeddod Upper veers angillite ond gyevrvaecke outeropping along
Ywanikn and Indata Creeks. On Kwanike “resk a string

of a sill with. eneansataeres rocks and on indate Creok a étringer Follovs
a Beale coutact. These cortacts appavently, agted as ghamne lweys for the |
cimnabar-béaring ‘solutions.

uD WOU ate Tepe betrataoaty els ith metallic mineral in all the coh Oni

cinnabar. It ocevrs as veinlets, blebs, snd incividw al grains, and
ostly as the red massive variety. Some. bright red, oarthy eee
occurs in the upper part of the Pinchi Lake deposit, and. crystallized
ginnabar in the lower part. <A little stibnite has been found atthe mine
in association with some very rich ore in the upper pant of the deposit.
A few specks of realgar. and of native arsanic occur in a delomite stringer
outcropping on Kwan ka Creek. Arquerite (an amalgam of mercury and silver
containing 66.6 per. cent, Leon) has been panned on Kwanika Creek,
Scattered grains of pyrite are found in all of the deposits. The common
gangue minerals are quertz, calcite, and dolomite. Most of the quartz is
fine-grained, but a few crystals were observed in open cavities. The
eahe and cinnahar were, deposited contemporanoously. in the Pinch. ‘Lake

lercury mine deposits, calcite formed before and after the cinnabar, but
net contemporane ou ai with it. In some svecimens cinnabar may bo scen
_ filling interstices between, exleite orystals end as coatings on the,
erystals. . In other specimens cinnabar and calcite fill cavities in which
it is quite evident that calcite was deposited first, then cinnebar, and
finally calcite again. Alunite (hydrous ae of aluniniur and
aCe aie hy Mey in mineralized limestoves at the mine. A few specks
of barite were observed in | ghuatolion an dolomite stringer in. tho
mercury deposit in serpen tine, on the Pinchi ae mercury mine property.
Schuette® has pointed out eRee mercury deposits are usually

~ Paes -

Ti Rae ~ . - ae : cera atleast see! NS Ht Nh ROA AAO, NO AEN A Nn AA GON BONY a 2
Schustte, C..: Tne Geology of Quieksilver Gre Deposits; Calif. Jour.
of ifines and

VIP 5

Gealomy, No. 1, vol. 35, Gna MSA DG

ome nn

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ne eae

Soman

anne! wears et tn ene tht Nee

founa under a cap rock or gouge..more dense than the receptacle rock in
which the ore forms. At Pinehi there is ne evidence of a continuous cap
rock, but in Die Ba Tea ea impervious frases of the sedimentary rocks,
euch, as uerushed schist and. quartzite, may have acted as: minor. trans to
ther raeing:) tree and. brought about local concentrations of clmmanare
The aay? are limited- in.a.wertical direction by facitr,.bub.other
boundaries are gradational: and depend on assay alues only, The easy
passage of the mnimeralizing solutions into fractured or torous rock
seams to have. been q mere,necessary condition in the.formation of ore

at the Pinchi Lake mercury mine than the presence of cap rocks.
Mos ne the. einnabar.at the mine fills preexisting openings in ths host
rocks. auch as fissures, solution cavities, and-interstices, and other
“factors being equal,.it.is apparent that the grade of ‘the ore inoroascs
“in direct ratio. ste the nunber of openings. ‘owever, thero has been some

replacement. of ‘the. wallerocks, especially limestone.

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