The Seattle post-intelligencer. [volume] (Seattle, Wash. Terr. [Wash.]) 1888-1914, 1900-03-03
SI[N DEVILS FORMATION.
Geology Of the Coming Mineral
Region Of Colorado
rs,clro THE LAVA FLOWS
-. u,stinct series of Veins of
,.s,.rert liberalization mt Ruth
.~-l.old Pocket Veins In the
s..s.t peIt-BasaIt blankets ~
Great Part Of the Mineral Zone
80. Parallel shoots of Ore.

~ 1870 ,,,r,ng district. and this may best
.havu by a technical description OF
e. sormation and geology Of the minerai-
~ - s,ss of the entire section. some Tea
80 81 the three Districts Mineral heath
"a seven Devils--are the same. al are
e " rsnvon. ali have slopes OF about 30
w. angle from the crest OF the
!. Inc river, and al are about the
tsns dt...ncc-.fhrce to five miles, In an
u u.s~so the river Their bases touch
Tassther they form a somewhat IN
n,.-.,,rsss mountain range beginning near
s..ss.~ton Or and extending north
MA ~ The mouth OF the Salmon river.
"A summing nearly north and south. All
~, highly metamorphosed ana soit
mid al early date as groundwork on
Az west. and granite on the east; an
-. ! more or less complete basaltic cap
p4.h sla,ss gently 70 the eastward. bu.
80 al extend westward of the crest. to
800 ~ forming the country from MILO
~ galley TO the Salmon river; all have
~ tssslt underiald by vast areas OF
sv.rtte witch extend In an almost com
s,ruous body through Salmon meadows to
~ "a stootb range All have bodies OF
,s,,phyyv on various kinds. formed as in
,,ustve sikes. which have been. at least
4 mart, the cause of the naturalization.
M basal,Ic flows have run eastward IN
sheets from north and south assures many
niles long. arising In the crest OF the
urre. and have come out at successive
ntsrvals. forming layers OF varying
ihlcknesses up to 1850 feet. Some of these
aows are so recent that hot springs still
,xint near them Probably none OF them
" earlier than the tertiary.
where the Basait Flowed.
sNf iaa
ARMED the Snake river plains between
polps and Pocatelo and are peculiar to
IN Snake river regions OF Idaho. Oregon
ana washington. One OF these flows from
ths EAGLE valley mountains filed up the
sal,ey Of the Snake at least 1000 feet deep,
changed it, course. and compelled II TO eat
cut new channel, cutting away the schist
along the eastern side OF the hasalt which
b now tho Snake river canyon. Another
Such how from the northern end OF the
s4ssn Devils cut Off the lower six miles
n the Rapid valley. which then emptied
int the salmon river. and filed Il up some
~ feet deep, forcing the river to cut its
way eastward some three miles TIL It emp
tied into tho Little Salmon. through tho
whist Tho dammins of the Snake below
Harrington formed vast lake whose
rn1e Pretended far into Oregon and South
N l6sho. reaching as far north as Coun-
III iekhc, and extending eastward some
distance beyond Boise. The shores OF this
ishs we're covered with rank vegetation,
composed Of forests OF willows. cotton
woods and naples. The waters were still.
ard deposited very much clay and sand in
beds, and In places extensive areas OF
tripsii and pipe clay. Many flows OF basalt
occurred while the lake existed. and prob
ably Z few after the Snake had cut its
eanyvn and no drained the lake.
No Ore IN the Contact.
The granite contact with the schist runs
hear the crest Of the range, and u little
EAST Of north, and with few exceptions Is
entirely barren OF pay mineral. Near this
contact however, either In the granite or
ne schisi. are located all the large depos-
N u pay ore, except IN the Vaughn,
River Queen, etc.
II w taks a single region. II Is almost
impossible 70 discover the cause of the
msnefailfaion, but II We take vii the dis
nsls together u Is not difficult to ma
cause. or causes We md that nearly
~ The veins run east OF north. that theS
ssahet 10 traced Tor any great distance
unanimously. that all tho ore and sanEue
eeNsf N shoots. that uutcrops OF porphyry
can Be traced for short distances only in
~ vicinity of some OF the leading mines,
sh'ifeH disappearing further on. and
Assn crop up beyond. These facts, I'm con
hsetion With the character u the gangue.
~ veins IN this region occurs IN lines
lAiAliel with the granite contact, or in
sstses ~ parallel veins. with occasional
ssvss vslhs. and that these veins have
sefent agencies
Two s~ric. of Veins.
fhsre are two distinct series OF yetna IN
aist those parallel with the granite
NniAst and those inturstraiined with the
AZ a.. Ahe AFTER afe always composed
se'ss esatts, ere 90 varying thickness.
.ty ever four feet as crooked as a
aMs Born. ana faullcd ia an sorts ~
they occasionally carry geld ia
~ raske,s " small size and are prob
sss,. SiasAS cases " utilization. They
49, nave any Porphygy wtta them. bat
Pa AsNr considerable mlcAcious iron.
80. Nefth star, at TIE head of Rapid
~ = nne 81 these mines
~ ~ sSa'st veins parallel With the gran
a. $3.50 s9sad for several miles out IN
~ 49, and parallel with the contact.
mn RsesN0lS exist all through the schist,
49, g~snet ~ traced much beyond the
- eseAsse OF the continuous bASalttc
sssss 49, ~. The Vaughn Is one Of these
essr, SO h&s A great nutcrop OF iron
$3.50 sAnsue Ia connection Min a isrsss
s.tsfFS eufsrup The River tsueen il
"a saeshss Vein parallel with ana north
irua ss "a z she Vaughn. but has little
t.s.ef - " pqtphNfy though that vii he
s X. eventually. Both ~ these sr,s rep-
s.s..spalae tetHs with quartz er troa-
49, ssnsae, and both are Isolated ore
sIA.,s AefN are a number % other
css,s,,. ea'ereps west OF Ruthhefg ana
'sree series at Nsius,
.ss. "asaestg are thrive distinct series OF
ass ~ aRfefent characterization. They
$780,. ~ s.9eAF ss-coppeT VEINS In sshist
kasrSsss inshS anese~Quarlx veins In
ffssls. saa Earaet-c0pper-t iron veins In
ns,sests. .sAs schist veins are Ike those
hs.n 1870 anoNe. and so Far. nothing haa
ssvsr NNs,x Ntta them They lie near the
asss .ale 2aaTtf-poryh Veins are
tAsn 49, naAfr continuous ana regular
-s elhegS- The AREA ~ Theses veins
sA8-t 's. wy y also runs east ~ north IL
go 'aite LEGALLY. and Is emhrac.s3
~vrrsS 49, nAst mile Wide There ara
Il H. .set veins Ruthberg Is nearly
v,ss's ago mach woTk u.s. 4,,,. ~, 49,,
~ u Aat a mlll was creet@A ~ trestf,,,,
raAs oat The presence ~ MAJ, ,S's
Ass ~ attempt failure 50 "a tittta
s-aie sern found. though some hirh-
II IN. t ,A mas recently been oueped I'M
Aosrt1,.s 'NenAhan- Allison p~operty ths
ansk 49, ne manEanesr has bea,, -,
vaipa mixed With iron and Quartz Ia he ~
OF @arnet-Granitc Veins
On ~ sArnesegranite veins lt, rr..t,.aa,-
ian ss crest of the GRANT,. sr - m,
~ we range. They are chsr, '-s'
be- -. ntANN outcrops az bY,,,.T, ~ -
shoots, carrying iron. copper