Ellsworth American. [volume] (Ellsworth, Me.) 1855-current, 1879-12-04

II Rop rt
WeAe ~ PrsT. ". r. Stewart.
NOv. sch, loSO,

n q port
NsAe ~ Pref. ". y. Stewart.
Nsv. sch. lssO.
The Robert Emmst 10 environed BY strait
OF the Huronian schists-rocks which con
stitute the surface area OF the major por
tion Of eastern Maine. These Schistoss
rocks are highly sIlIcious. and are usually
striated At exposed surfaces, by innumera q
bic segregated veins OF barren white quartz
ranging from mere threads to an inch OF
more. 10 thickness. The Schistoss strata
present well defined lsminations In struc /.
urc, but they have been greatly fiexed aud
tilted BY lateral pressure, until they presen.
every degree OF inclination from q few
points below the horizon, 20 the absolute
vertical. The general trend, or bearing OF
the upturned strata In Egypt District, Is
nearly Northwest and Southeast, but ow.
Ing to local disturbances In certain local.
tiles by obtruding trap dykes, the trend IA
sometimes nearly east and west. Another
Theological feature Of the District ls 4 thick
surface stratum Of tough srgilaeeous sand
stone; but as this rock lies conform able
with the schists. and maintains q like lam
inasion and trend, the quartz velns pass
through 1t into the lower series In regular
degrees Of strike and incliuation.
| The Robert Emns>t hoisting works rest on
. bold blum. or headlsnd, composed OF the
rocks just described. This bud Is nearly
perpendicular. and has an elevation shove
,ide-wa,er OF about twenty feet. Ia the
Southeastern face OF the bluf, there is an
exposed vein OF quartz ranging 10 width
from twelve to eighteen inches aud which
extends from the apex OF the blu6 quite
under the waters o! the bay a. is base.
Al this point the quartz vein. a. well a.
the enclosing strata Of schis,s. has = dip
! approaching the vertical-bearin about
'50 toward the Southwest The quartz
vein 10 strongly minerAlized with yellow
copper pvrites and sulphurct Of iron with
occasionAi crystals OF galena. Tho sdja-
cent schists are also strongly imprsRnsted
TO the distance Of several rods on either
eide OF tho Quxr,E' vein-with copper py-
rites; green and blue csrbonA,es Of cop
per; native copper aud scAms OF compact
graphite. In very brief, tho eu,ire zoue Is.
Al this juncture. a thoroughly minerAlixed
mass OF copper bearing rock. and. accord |
Ing to assays made by reliable parties, the |
quartz veinstone. a. we'll a. the cupiferous
schsu. contains from 4 mere trace TO n |
ounces OF silver per ton OF rock.
The owners OF the Emmet have wiseiy !
commenced the work OF exploration by
sinking 4 vertical shaf, which will eucoun-
ter the quartz ledge at consider able depth !
from the surface. The shaft 10 now down |
to ihs asG;a OF thirty ies.. or more,~e9a
matter aud what Ia better, they are, At
every foot OF excavation, becoming moro
richly mlneralized with the ere OF copper
and silver. Eastern Maine, Is unques,ion- |
ably, a silver bearing region. This i'm
portant fact has been fully demonstrated
10 many different localities; and, as 1t has
been long ago proved by actual experience
that. when aracntlferous ds,ure-vsins are
capped At tho surface by the ore OF
copper, zinc, lead, An,imony, and other
base eleEse nts, the lode is almost invariably
sure to become free-miliinS silver ores as
depth 10 at.Aired from the surface.
10 other words-as . rule-the base ele-
ments gradually fade out from the deposit.
and ultimately give place to rich ores Of
silver sulphurets. This gradual shading
out OF rebellious elements, is . notable
characteristic Of many of the leading mines
/ OF Colorado. Arizona and Nevada. At the
ut.crnp. the famous Comstock contained
! heavy percentages nf zinc, lead, sntimony,
and arsenic; bat at the depth OF three hun-
{ dred feet from the surface these rehellious
substances entirely disappeared from the
| mine, aud not trace Of either OF them has
been encountered since-although many Of
the Constock mines are now being worked
at the profound depth OF 2 700 feet. Guided
by such well established precedents In 9TH
er mining localities. /. Is safe to predict
that the Robert Emnse. will ultimately
and at no very great distance from the
surraee-became solid lode OF frse-mllllng
suiphuret OF silver. The thorough miner
alization Of the brosd belts Of schis,ose
rocks fianking both sides OF the quartz
vein, or central ore channel OF the Emnet.
Is . most encouraging sign, for u 10 now
very generally conceded BY the most emf
nent geologists Of our time that ore veins
have been tertslized BY minerals contained
10 contiguous rocks by electro chemical
agencies. In other words-the heat en-
gendered by the election OF volcanic mat
ter through = minerHlized zone Of rocks,
sets in active currents Of electricity-these
again create magnetic action and the min
eral atoms confined in hydrous pores OF the
rocks are literally leachsd from their iurk
ing places and percipitated In the ore chan
nels where we nnd them. As Professor
J. LIE C0ate states it-"Metsliferous veins
have been deposited from hot alkaline
waters, circulating through assures.
The Steamboat Springs. near Virginia City,
Nevada, come up through assures IN COM
paritively recent volcanic rock. The wa
tiers are strongly alkaline. and depo.it Sill
ca in abundance. BY this deposit the ns.
sures are gradually fiiling up and forming
veins. Some assures are now partially
and some entirely filled. The ribbon
structure 10 some cases 10 perfect. More
over. sulphides Of several OF the metals viz |:
lead. mercury, copper and sine. have been
found 10 the quarts veiD-sts6 Here. then.
we have true metaliferous veins forming
under our very eyes" The distinguished
British Geologist. z. Hopkins says "A
magnetic, or galvanic current pacing
through solutions. II not the actual ssodas-
operandS OF nature, Is at all events capable
OF giving . rational solution. not merely
OF the mineral veins, but also Of oil the op.
erstions OF nature disclosed BY geology"
Authorities to prove that veins have
been minerslized BY magnetic currents
passing through hot chemical solutions,