The Seattle post-intelligencer. [volume] (Seattle, Wash. Terr. [Wash.]) 1888-1914, 1899-11-29

James Robinson, The weIl-known mining
engineer. who has examined great deaa
Of the Cascade country during the re"
past few months. makes the most compre-
hensive report on the Slate creek district
that Ia oDsAinabie at this time The faii
OF snow prevented him from doing the
district az thoroughly as he had intended.
but he gathered information Of those parts
Of II which he could not inspect from the
most reliable authorities. The District Is
In Washington. at tae head Of me creek OF
the same -sams, which is Il tributary Of the
Skagit river. A, present the most COM
Portable approach is from the east, Dy way
II Venatehee TO Brewster, on the Column
bia river and thence by horseback over
good trail to the mines. narrow gauge
wagon road runs from Robinson creek TO
tho mines, bat as no animals can be OBJ
tanned 1T Slate creek. IL Is advisable 10
procure them al Winthrop IL any excur-
sion from the mines Is contemplated. The
Slate creek district comprises Canyon
creek. and the north. east and south forks
Of Slate creek, all heading up At the d.
viding summit of the Cascade range. as
show by the accompanying map, which
Mr. Robinson has sketched for the Fost
IntelIigencer.
Ge0Iox icaI CharactertstIcs.
The North Fork" said he. is the one
have been found, and on which the most
development has been done My obssrva-
tions extended only from this paint 10 the
headwaters Of the Eouin Fork. in a line
little east OF south and as there was in
nc place less than foot OF snow, / did
not get as clear an idea or the surface az
could wish In a general way. however.
the backbone CT the Cascade range at this
point is entirely porphyrittc. with large
porphyry bikes running parallel with 1t
and lifting Up and replacing the original
black slate which forms the entire country
rock down the watershed farther west All
tho veins SD far found, which have stood
the test uf development, lie in these con-
facts OF slate and hard gray porphyry, with
dip to the east OF from ~ to SIS degrees.
The general character Of the quartz is
hard and fine grained. but not glossy. IL
carries gold. both free and In ,ellurides.
together with a small percentage Of iron
sulphices. also carrying gold values. The
veins all badly faulted. both horizon
tally and perpendiculariy. and the values
seem to run in shoots of more or less
length. some portions Of the veins being
almost barren"
Mr. Robinsons further and detailed de-
scrtption Of tho mines and prospects. Of
course. gives the Eureka first place as
that In the characteristic property OF the
camp. 1. Is situated on the North Fork
as indicated in the diagram map and Is
owned by C. w. Toxer and e. A. Lane Of
San Francisco. 1t was secured on very
favorable bond for about sseeoa. TO be
paid practically out Of the mine
Developments ON the Eureka.
The Eureka Is developed by a crosscut
tunnel 40 feet In length cutting the vein.
and shaft 100 feet deep connecting with
1t from above. AT the fifty-foot level In
this shaft couple OF drifts have been run.
showing a body OF ore between twenty
nve ana thirty feet In width From the
tunnel level IA winxe was sunk some nifty
feet In what Is supposed 10 he the slate
footwaii. and IL was N this winze that the
rich syivanita or. was found Work was
stepped at this point. and nothing has been
done I'm the mine for soma time, as the
labor was needed for outside work
Mr.. Tozar informed AIR. Robinson that
he had q 100 tons Of ore in sigh, that would
pay net profit OF SO per tom and that
no had iS4 pounds u sylvanitc ore cached
which would run si5o,eco 10 the ton. or
3ii.s5a pay.
TIE appearance az this rich quartz IS
yer. pronounced. II IL sho; fun Of pebbles.
powders and sivers or porphyry and slate
to the probable extent of % per cent o.
the whole. THE values are entirely I'm
gold. and In the ordinary ore are about
half free. with the remainder In ivon sui-
phiies and minute speeks OF teliurium or
sylvsnlte
A tau-stamp mill ia being erected II
VIII be connected with the mine by n
surface tram s.4oo feet in length. The al
,itude OF the mill Ia 5i1o feet. tina, OF The
tunnel s.sa fess. II IS doubtful whether
the mill can be pitt IN shape Cor operation
this year.
Condition Of the Mammoth
The Maramoth IS situated about half a
riie below the Eureka mill. II Is an Tn
corpcraied company and Is equipped, with
nve-stamp mili and tables The vein
has a slate foctwali and poruhvrv hang.
Ing wall. It's development consists cf two
tunnel levels about 20 feet APART and
sufficient ore Is exposed to run the mill a
number Of months AZ least The tunnels
are conr~ctei with the mill by a tram
way i.ioe fee, In length. The vein IS sub
sect 80 all kinds ~ faults sixty feet be
lug tho iorTest distance between them
Its Width Is from eighteen inches - faslr
feet. and h runs frun SO 81 ssn per ton
although specimens can Ia found witch
will run into the thousands az dollars. Il
Mr Bailnrd's intention tn ra,,, the
mill all winter bur the scarcity az labor
has rendered Il question whether ho
can secure supply ~ fuel sufficient -
enable him to 10 SO
The process az treatment Il reported IN
he success. the talslugs showing little
loss THE concentrates rUn close "a s. ca
Some OF the more valuable ore tf.4g~ rot
amaagsmste. eut K ia very heavy an.;
settles In the bottom eg the mortar IN the
form Of black concentrate % a c9r.-
sistency between sand aaa snud About
10 pounds was taken rrons the mortar
prior 10 Ny. Rohsnson's visit uhErh had
II value OF over S.soo per :on-
Purchased on Easy Terms.
The Ballard Bros, purchased thts ,z,tne
without capital fer s&Aea Stock vas
taken for portion and Pay gfant wss de-
fcrre8 fer 81 ione time. The company WAS
organized far s. ~ ~ and stock In small
lots wss sold az - ceets per share - en-
able them &c develop. buisi n fmtu ard
make payments ca the property They are
holding their stock uaw az - seats Ter
share and Sod quite a block lately
The Tacoma lies across and q uftte
above the Mammoth SpokaSe fSogle
have taken q bond cn & sar g. Mr.
Robinson dt3 not Sample TIE Nesw which
H. exposed merely In al cpen cug and ar
elongated SHAFT eight gea' deep. It's ~ Tn