The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1918-04-18
GEOLOGY OF SUCCESS
FURTHER DISCUSSION
NooRE'S THEORY SUPPORTS
THAT HELD BY GEoLO.
GiST HERSHEY.

The Mining and Scientific Press Of
April contains the following COM
munication from Oscar H. Hershey
OF Kellogg, in which he finds his con-
tention regarding the ore and granite
of the Success mine in /. measure
substantiated by the conclusions of
Stanley Moore. until recently and for
several years, engineer for the Sue
cess company. Mr.. Hershey's letter
follows:
Ore Replaced Granite. =.
I'm your issue of January 5 there is
a communication from S. r. Moore
under the above heading 1t may be
divided into two parts. The first
draws a tentative conclusion from a
series of observations extending over
a period of years. He says, referring
to the idea that granite (monzonite)
has been replaced by ore, from Il
physical point of view. there always
appeared to me to be a doubt, since,
in all specimens of granite contain
ing stringers of ore, these are invar-
iably a continuation of quartzite
question always comes to my mind
whether these stringers might not be
a replacement of quartzite stringers
in the granite, the quartzite having
been entirely replaced To those who
may have taken some interest in the
controversy as to the priority of the
ore and granite in the Success mine
desire to call attention that this is
the testimony of the man who has
been superintendent of the mine for q
number of years, throughout the per-
iod Of greatest activity. AS testi-
mony, without regard to the conclu
sion his remarks seemingly imply, it
is in line with the position that have
taken in the matter of relation be-
tween the ore and granite.
1.-THE second part of Mr.. Moore's
letter describes a nodule of granite
surrounded by ore. He has kindly
mailed to me the evidence. 1t con-
sists of half a dozen fragments Of
dark reddish brown sphalerite ore.
There are traces of galena, pyrite and
There are also a num-
Der of residuary patches of the rock
or rocks replaced. The larger patches
at least are unquestionably monzon-
lite. was unable to fit together the
six fragments so as to enclose the no.
dule nearly as large as hens egg,
but a patch about an inch long and
half as broad certainly disappeared
from view when two Of the rock frag-
ments were adjusted in accordance
with instructions contained in a let
ter from Mr.. Moore. However, this
nodule may be connected with the
larger one in the interior of the large
fragment. Therefore, so far as the
evidence now stands, it is not proved
that nodule of granite was entirely
by ore. / have not been
authorized to break the large frag-
nent to learn whether the suggested
exists. If Mr. Moore
breaks the fragment and finds such
does not exist. it does not
natter. The ore minerals penetrate
he monzonite in manner to prove
that those in the mon
.onite are younger than the intrusion.
will go SO far as to concede that the
is residuary, probably isol-
tied fragments In the ore. ]. B. UNI
,leby has proved, in paper published
\ the February March number of
Economic Geology, that such replace
nent has occurred on a limited scale
n the Success mine, but in a later
ssue Of the same journal take the
POSITION that it has been the result of
United migration of the sulphides Of |
arlier veins closely following the in
rusion Of the monzonite into these |
ems. 1t is mighty simple mineral
eposit that does not yield evidence
pparently supporting contradictory
heories of origin. In this case, / be-
EVE the preponderance of evidence is
n favor of my view. For instance. !
rel inclined to give much more weight
D Mr. Moore's observations extend
~ over a period of years than to his
iscovery, after these years, Of no.
ule of granite enclosed in ore"
The small boy who wont fight is al