The Black range. (Robinson, Socorro County, N.M.) 1882-1897, 1882-10-06

and a pig Of black copper found at the
mine. and supposed 10 be from an Aztec
furnace. The well known Torreuce
mine Is also represented by some char
acteristie mineral. The ore Is psinci-
pally chloride OF silver In baryte
gtngue. II averages from sS5 To 500
per ton. aud is said TO occur In large
quantities. Tue mine Is developed by
adils and is said to have considerable
| pay IN sight. In addition 10 the pre-
dominating minerals some rare yanadi-
um compounds are found in the vein.
which is described as a deposit between
lime aud Porplyry.
The Goodeuough mine sends some ore
valued at $500 per ton. The mineral
is silver copper glance and carries sixty
tive per cent. copper. The Cooney mine
also sends some rich ore, which is prin-
cipally sulphuret and carbonate of cop
per.
The display from Grant county, while
containing many fine gold and silver
ores. is particularly noticeable for the
specimens of copper ores aud native
copper. The gold ores are free milling
quartz of average grade, and the silver
minerals are of similar character. The
veins are said to be usually contacts
between lime and porphyry, and to ay-
erage four and oue-half feet in width
Several properties from Pines Altos
aud Hanover are represented 10y good
ore belonging TO this class. The copper
ores are found in assures and deposits,
aud are usually oxidlzed minerals. Ma
tive is found IN abundance in some of
the properties, notably the Santa Rita,
Del Cobre, and occasionally copper
glance 4 hne case of selected speci-
mems Of all CLASSES of ores occurring In
the county is exhibited, and affords an
excellent idea Of their variety and char
acter. 1t contains some unusually fine
pieces of velvet copper, and also some
specimens of native silver, which are
remarkable for perfection of crystalline
form. The Santa Rita del Cobra copper
mines send plates of native copper,
crystallized cuprite, and other associ.
ated minerals The display of native
copper is the finest at the exposition.
The general geological formation of the
district is series of sedimentary rock.
probably OF the carboniferous age, over
lying metamorphc strata and capped
by tertiary trachyte. The principal
mines, for there are many IN the group,
are those contained in the metamorphic
rocks, which were at one time an argil-
aceous sandstone, and have been altered
by heat to aquartzite, e,containing blotch-
es OF kaulnized feldspar. 1t Is much
fractured and jolnted, and Its extent
and thicki, IS are unknown, as the de-
nudation has not been sufficient TO ex-
pose more than few feet in the vicinity
of the mines. So far MS has been ex-
plOred, the copper is found distributed
through the rocks in plates and scales,
filling the original joints and fractures.
These shells of copper vary in thickness
from that of Il sheet of paper TO three
fourths of an inch. And except where
meteoiic agencies have oxidlZed tie
metal, it is inyaribly found in the ma
tive state. Above the metamorphic
strata is bed of schlst, between which
aud the quartzlte is a bed of hematite,
several feet in thickness and of excel
lent quality, and carries occasionally a
considerable proportion of carbonate of
copper. These mines were acquired a
century ago by II Spanish officer, and
their history is full Of interest They
, have produced immense quantities OF
copper and will continue to do so foi
some time to come.
: Bernalillo county is represented by
some oxidized copper ore, which pre-,
, sents the peculiar woody structure Sc
! common to Nacimento ores.
: Lincoln county is also well represent.
. ed. The Homestake, White Oaks dis.
. trict, sends some brecciated siliceous
ore, carrying free gold and pyrite, val
. ued at from 81 100 to S3,S00 per ton. The
{ ore mill-runs from SOS to $500 per ton
/, It's a whitish, iron-stained rock, and
is characteristic of the free-milling gold
! ores of that district. The Old A be il
/ also represented by ore similar in ap
? pearance and value. The North Home
I stake sends Il mass of brecciated quartz
/ eemented by CLASSY quartz coating.witl
} little talcose and ieldspathic materia
t associated In punches. The value !:
| from $50 to $4,000 per ton averaging
about the same rs the South Homestake
!, The vein is a tssure about three and ;
+ half feet wide, in granite, with layel
. of porphyritic material on each side ot
: the pay. The Vera Cruz sends fret
1 milling gold ore, worth 81 per ton from
e a pay streak sixty feet wide-dirty
D whitish yellow material, of probabl,
siliceous lime composition. The Whit
I Mountain ores are represented by spec
l. itnaue from the Christ mag and Mootl