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tu re. In a porphry only part of
the grains had sufficient time
and he it to grow so that with
a change of temperature, press
lire and other physical eondit
ions the balance h id to r msol
idate as a fine ground n iss‘
Labratory experiments so!
ubions of salts check with this.
Porphry intrudes gremist
one and shale and occasionally
ljuiestone Mi ic t e M cC"uwttPl^ist
riel and forms part of the mono
tain range extending near the
KusUulana to Dan and Cuititu
creeks. Porph'.y dykes, which
are offshoots, intrude the shales
of Dan and Chititu and are held
to be genetically connected with
gold quartz veins now fo nul as
placer. The.magnetic bi tck sand
found in panning and in the
clean ups originates as magnet
ite in the porphry.
It is held that the porphry
intrusion may have heated in
part the copper solutions which
formed the copper deposits of
the district.
Instances of porphry invad
in^ the shale form it ion is clearly
seen in the mountain opposite
McCirthy, across Kennecott Riv
er and we observe large blocks
of shale included in the magma
and later porphry dykes cutting
the shale. Sourdough peak is
porphry while the hill itself is
shale. The most interesting occ
uran e is seen on McCarthy
Cheek above mile 5 at the two
bridges. We observe a dyke, a
complementary from the main
mass to the west., selling a
crevice in the sli de which in ist
have been form *d by folding ol
the shale due to the intense act
ivity of the porphry magma lor
cing its way from below. [1
should be rein labored here that
all this activity took place deep;
underground and has since be
come exposed through the agen
cy of erosional wot k of ice and
vv ter and oilier physical and
chemical action.
One matter of note is the abseii
ce of any noticeable degree ot
metamaplusina change at the
cent act of any rock which the
porphry cuts, but the wri>r
somewhat recoliects an insi mce
along tne Nizina Uiver on a low
rim where the shale contact was
ov>ervcd to have taken on a mica
shist appearance several inches
on both* sides of the dyke. On
weathering of ; he porphry the
long dark gr< <. n pusins ol horm
blende leach out and leave a
rusty mass in us place. Pyrite
leaches in the same manner.
Porphries have an important
bearing on deposition of ore in
tiie Western States They are
in part of the contact t> pe
especially with limestone. Gold
quartz veins in certain kinds of
rocks are formed thru their
presence. In Colorado tney are
connected with silver and lead
In Utah and the south west
with copper, in Mexico with
silver and lead, in South Amer
; ica with copper, silver and tin.
Porphyiitic intrusions are
keenly sought by the experienc
ei western prospector. It should
not be assumed that all porphry
rocks contain workable deposits
but quite frequently porphry
areas have proved the prospecto
r's logical field of reward.
Postman: Pad luck Mr. Doolanl
Here’s a black edged letter for
you.
Doolan; It's me poor brother
dead. I know his writing well.
, Don’t overlook that subscrip
; ion. Kenew it now.
i
Copper River
and Northwestern Railway
THROUGH SKU.V10E TO CORDOVA TWICE WEBKEY .
R A. HANSEN Supt. ('. R. PUGH. Af'-.nt
Kennecott La u si dry
Met arlLy Agent
S. Wold
Alaska House
KENNECOTT
ALASKA
Front Street
Mrs. INsorah Moore
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