The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1915-02-04
over and under the occurrence were
here notably absent.
Enrichment Evidence.

Enrichment Evidence.
4 Enrichment in this case may ne de-
fined as change in minerals, result
ing in a higher copper content with the
casting aside of others. In the de-
struction of the primary ore and It's
change to the finished type, the by
products must be accounted for. This
Is POSSIBLE in the Snowstorm mine.
The discarded iron of the primary
chalcopyrite is found DIS hydrated OK
ide In the smashed rocks on the east
side of the ore beds Also these rocks
show the effects of acidified water The
micrograph shows the occurrence OF
copper in quartzite at the SnoWstorm
property.
/ Chalcopyrite is almost absent from
the Snowstorm mine, but comes into
notice gradually toward the west as
the zone of lesser movement Is APP
iproached In the National mine u
occurs in the proportion of about half
and half, while in the north division
the amount is much greater. piece
of rock. of given size and degree OF
dissemination from the SnoWstorm
mine, will carry double or more the
value that rock of the same size and
degree of dissemination in the north
division would, and at least one and
one-half times that in the National
nine although some portions of the
, latter are almost as good.
The Snowstorm mine | consider an
example of the enriching effect of the
! fault dams. The best ore lies against
the side fault, and on the dip the ne
, cessary distance up the strata to es-
; cape moisture effects from the lower
dam westward from the dams, the ore
, gradually becomes lower in grade. In
+ all probability this win be the rule In
, the National mine. If the main adit
; were extended ahead the beds would
be found at no great distance, and the
point of strike change determined.
However, the smashing effect may be
: great enough to allow water circula-
ton to the detriment OF the ore. Fav-
, orable country should be found on the
) other side of the strike change
Everything points to the presump-
tion that the rocks along the strike
Z west from the Snowstorm mine are
D favorable prospecting territory If ex-
ploration be conducted low enough to
1 get into the influence of the syncline
4 fault. The beds are well impregnated
: west of the No. level, and in adjoin-
4 ing ground show marked improvement
t In the lower levels over the upper.
0 Properties working nearest the syn
a cline fault dam have distinct ad-
a vantage over those higher up.
d Range of Termination.
r 1t has previously been said that the
: copper beds will end on the dip into
e the fault occupying the center of the
e syncline. For the south division, this
: will give them a range of from about
h 400 feet above sea level, at some dis
n lance below No 8 level of the Snow
: storm mine, to about $3.50 feet above
= sea level at the National mine end. The
latter level is about that of the town
of Mullan. The distance on the dip
e will give much greater stopping length.
y The copper beds in the north division
e will not go so deep because of the
It flatter dip and the closer proximity OF
k the syncline fault. The point at which
: they will intersect will be between the
: National lower adit level, or 3963 feet
| 60 ~
l. mentioned According to the interpre-
E. tation here offered, the prospects ly-
e. ing between the Snowstorm and Ma
tional mines are working too high In
al No. adit of the Snowstorm company
h at its 3990-foot elevation above sea
II level would cut into the heart of the
" copper beds at about the right dis
h lance above the syncline fault and
lie serve as the prospect adit Of all under
e. one management and plant The work
lie in the Missoula Copper group should
e be at least 500 feet lower vertically
= The beds show a marked increase In
IS copper content on the present working
l. level over the upper (they average
l. around 0.6 per cent?, and driving along
re the strike will only serve to emphasize
If this fact intsead of developing ship
It ping ore. Chances are highly favorable
ID to LIZ per cent ore as the syncline is
Ia approached The long adit of the
d Copper King group cuts across the
= Wallace and st. Regis copper beds,
Ie and the owners dissipated their ener-
ar gy and resources in following scattered
punches in fractured areas adjacent.
is Extending the work northeast directly
TX across the beds would bring 1t, In
lie. from 1900 to 1900 feet to the copper
W beds in the Revert, and at zone 57O
T. feet below the Mssoula group work.
= ings. This is very favorable territory
,r for pay ore. The Copper King adit on
t. the Mullan side of the divide is the
,e logical point to tap and drain the
country along the strike on the Canyon
y creek side, as 1t is 400 feet lower ana
II would save the duplication Of expend-
l. iture in development. All the pros
e. pect work could be concentrated on