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D. S. GEOLOGICAL SURVEY
REPORT ON HYDER DISTRICT
Reprinted from U. 8/ Geological Survey Bulletin No.
778—B, "mineral investigations in southeastern Alaska," 1
925: BY A F. Buddington.
The continuity of the ,veins
and the quality of their min
eralization is, of course, a
most important consideration.
Some of them, as exposed at
the surface, are several hund
red feet long and pinch
abruptly or are displaced by
faulting. In some places the
fissure persists beyond the
vein matter. Other veins have
been proved to have a mini
mum length of 600 or, 700
feet, with their tqtal length
undetermined. One vein on the
Riverside group appears to
have been traced for nearly
2,100 feet and to crop out at
altitudes from 200 feet up to
900 feet. The tunnels at. an,
altitude of about 250 feet on'
this vein, so far as explored,
show the vein to consist ouly
of stringers of quartz in
schistose grandiorite. Develop
ments have not proceeded far
enough to give an adequate
idea of precisely what may
be expected. For this reason
the deductions of Knopf from
his study of the development
of the quartz veins which oc
cur in granite rocks of the
Berners Bay region are of in
terest here and are'quoted:
“It has been pointed out in
previous pages that the veins
were formed by the move
ments of the walls past each
other along gently sinuous
fractures. Pinches and swells
are therefore encountered on
the levels along the strike of
the veins. Similar variation is
to be expected vertically, al
so, although development has
not yet been sufficiently ex
tensive to demonstrate this as
a law.
Inasmuch as narrow portions
of the fissures are commonly
occupied by masses of schist
ose diorite which are here and
there interlaced with quartz
MAP OF
PORTLAND CANAL MINING DISTRICT
HYDER, ALASKA
! ' • L Nl
' ; - * .*» °
<1
THE PORTLAND CANAL MINING DISTRICT
PrtMBit Greater Opportunities for Legitimate Mining Investment than any Mining District
ea the Continent. In ^additionto the great Premier, the most Spectacular Silver-Gold Mine
in Eaiatonss, with a record of over Seven Millions in Dividends in Four Years, the Portland
Canal District contains Two Producing Mines; a Half Dozen or More on the Very Thresh
old of Production, and Numerous Partially Developed Properties Which Held Forth Every
Premnct ef Becoming Paying Mines.
The MinsssKirstion is Provedi Only Capital and Intelligent Mining is Required to Make
fhn Bhtriet the Greatest Mineral Producing Area en the Gldw.
stringers, schistose zones are
worth exploring or drifting on
in the chance of striking oth
er valuable ore bodies. This
possibility was forcibly illust
rated at the Julian mine,
where an 18-inch zone of
Crushed diorite of most un
promising appearance opened
out when followed along the
strike into a'strong and val
uable ore body. That this is
no infallible rule, however, is
clearly demonstrated by cert
ain fruitless attempts that
have been made under its
guidance. In the most con
spicuous example 500 feet of
tunnel was drifted along in a
schistose zone in the diorite
without encountering a ledge.
The probability of striking
an ore body is apparently
strongest in those belts of
crushed or sheared diorite
that are penetrated by quartz
stringers.
On the whole, the downward
persistence of fissuring would
seem to be proved by the
deep-seated origin of the vein
forming solutions, as shown by
their mineralization.”
Westgate has described five
veins at the Pish Creek claims
which, to judge from the
claim map, constitute a group
lying within a radius of 500
feet. Other veins are found
on the same group of claims
but at greater distances. All
the veins show a similar type
of mineralization with shoots
carrying much silver. At the
Riverside property three veins
lie within a width of 600 feet
and likewise show among
themselves a similar type of
mineralization but different
from that of the Fish Creek
group, though the two groups
are only a little over a mile
apart. The Ibex an Homestake
veins, on the north side of
Texas Creek, are similar to
each other in type of min
eralization. The occurrence of
several veins in a group at
the Fish Creek and Riverside
claims suggests that probably
new veins with similar min
eralization will be found in
the vicinity of the Homestake
and Ibex veins.
j The metallized veins ax<
, known to occur throughout a
vertical range of nearly a
; mile, from an altitude of 200
| feet at the Riverside group
: to 5,000 feet on the Texas
, Creek Comstock claims, on
! the West Fork of Texas
Creek. The sulphides of the
veins persists in depth and
that if any change occurs it
| is one arising from peculiar
j ities of the original deposit
i ion. The mineralization of the
I quartz fissure veins agrees
| essentially with the statement
| made by Westgate with re
I spect to the mineralization in
i the Salmon River district in
general.
Prospects Near Salmon River
TITAN
The writer did not visit the
Titan group of claims, and
the following data were furn
! ished by S. P. Fitzgerald, one
I of the stockholders. The prop
erty is about 41/2 miles by
trail from the intersection of
the Fish Creek trail and the
Salmon River road. It com
prises 10 claims located in
1917 and held by the Titan &
Salmon River Syndicate. The
developments consist of 400
feet of tunnel, started in the
fall of 1922 at an altitude <ol
2,950 feet, and a short cross
cut from the tunnel that is re
ported to have cut 12 feet ot
quartz running about $4 in
gold and 6 ounces of silver to
the ton. The quartts is sparse
ly mineralized with galena,
pyrite, and sphalerite. The
country rock is quartz por-'
phyry, similar to the type
found at the Premier mine
and the Alaska-Premier pros
pect. Rich stringers are re
ported to have been found
in the porphyry, picked speci
mens of which assayed as
much as 4^ ounces in gold to
the ton.
FISH CREEK
Developments on the Fish
Creek property up to 1920
have been described by West
gate. Since his report was
written the main work done
hos been the prospecting of a
new vein on the Olympia
Fraction claim. The vein is a
metallized quartz fissure vein
in quartz-hornblende diorite
and has been exposed by a
series of trenches along its
strike for a length of about
300 feet. At each end it tap
ers off abruptly, though the
fissure continues in each di
rection. The vein strikes
about N. 60 degrees W. and
dips 50 degrees NE. The vein
matter breaks freely from the
wall rock, and the walls show
marked slickensiding. A nar
row dike of dense black
lamprophyre cuts the vein.
At the longest surface trench
the vein is from 4 to 6 feet
wide and consists of quartz
with 5 per cent or more of
disseminated sulphides and
with stringers of solid sul
phides so localized as to con
stitute rich ore shoots. r The
gangue is mostly quartz, with
some calcite and brown side
rite. The sulphides include
galena, tetrahedrite, chalco
pyrite, p£rite, shalerite, and
rarely a little arsenopyrite.
The tetrahedrite occurs in sol
id streaks as much as 2 inches
wide and is rich in silver.
Forty tons of sorted ore taken
| from the surface trench is re
ported to have averaged about
$90 to the ton.
! At an altitude of about 2,800
feet a crosscut tunnel 125
feet long was driven to inter
sect the vein. Near the end of
i the crosscut a winze was sunk
on the vein for 42 feet and a
drift run along the vein to the
southeast for 120 feet. In the
drift the vein ranges from 2
to 5 feet in width and locally
contains inclusions of the wan
rock. In the winze the vein is
reported to narrow and the
tenor to decrease. It is report
ed that 55 tons of sorted ore
was taken from the drift and
shipped and that it averaged
about $90 to the ton.
About 30 feet below this tun
nel another tunnel was start
ed on a fissure and driven for
a total length of about 400
feet. The fissure on which the
tunnel was started did not
lead to the vein sought, but a
I
i *******»»»» *
that of the Fish Creek group,
tunnel intersected the vein,
and then a drift wa3 run bacic
along the vein for about 50
feet, and from its face a raise
was opened to the upper tun
nel.
SWEDE
The Swede group is reported
to comprise six claims on the
mountain side about a mile
south of Elevenmile. Thesj
claims were not examined by
the writer but are reported to
be similar in type to the Daly
Alaska prospects.
ALASKA-PREMIER
The Alaska-Premier gmou
(not to be confused with the
Premier mine, which is on the
Canadian side of the bound
ary) comprises 25 claims he
tween Elevenmile and Fish
jCreek. The general country
t rock is greenstone with intor
! calated beds of slate and
! graywacke. Three sheets of
jfelsite (quartz porphyry) cut
! the greenstone and the sed!
! ments. Present developments
are being directed toward
! finding an ore body within two
I of these sheets. The northern
j sheet, on the Alaska claim, is
about 40 feet thick, strikes
about N. 60 degrees W., and
dips 50 degrees E. A short
prospect tunnel 15 feet long,
i at an altitude of 1.400 feet,
j been driven on a mineralized
; streak in the sheared felsite.
i Veinlets of quartz several
j inches thick, with pyrite,
j sphalerite galena, and a little
j pyrrhofite and carrying con
! siderable gold have been
j found. On the Ready Money
claim the second sheet of fel
site is being prospected. Open
cuts have been made, and a
tunnel is being driven. At
! about 40 feet above the tun
I nel an open cut was made on
! a very rich pocket of mineral
ized, veined, and altered fel
cite. The rock is shattered,
veined with quartz, and much
silicified. Veinlets and blebs
[of sulphides occur through
out the pocket and Comprise
I pyrite, sphalerite, galena, and
! a little pyrrhotite and chal
feet and had cut about SO
ounces of gold to the ton is re
ported to have been obtained
on assays of selected speci
mens. A crosscut tunnel at an
altitude of about 1,300 feet is
being driven to cut the felsite
sheet. On September 9, 1923,
the tunnel was in about 200
i feet and had cut about 3o
i feet of felsite.y The country
rock at the entrance to the
tunnel is a dark-gray to brown
hornlike stone of uncertain
origin. The tunnel passed
through about 50 fc t of a
light-colored diorite porphyry
dike which does not show at
the surface. The whole zone
of lelsite is fractured, and the
fractures are faced with small
pyrite cubes. These small
cubes are also disseminated
throughout the felsite. Rarely
! a bleb of pyrrhotite occurs.
Such rock is reported to ave
rage $2 to $3 in gold and about
1 ounce of silver to the ton.
CONTINUED NEXT WEEK
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