El Paso daily herald. (El Paso, Tex.) 1881-1901, 1899-05-16
PRICE BROS, Grocers.
JARILLA FORMATION
And Its Mineral Promise
Large Variety of OreS-TWO
Hundred and Fifty Mining
Claims Held In the JdriIla
CdmD
Special Correspondence of the Herald.

Special Correspondence of the Herald.
MoGoRDO, N. NJ, May 13.-I
have examined more carefully the for
nation of the Jarilla Mountains and
for the information of those interested
in mining matters, give description
thereof
The formation consists generally
of igneous rock with great areas
covered with limestone of varying
thickness. These are crossed in various
directions by q multitude of dykes OF
porphyry and trachyte- There is NO
general regularity in the formation. In
localities the strike is northerly and
southerly with north easterly dip.
while in other places the formation
lies almost fiat or dips towards the
west. In places the limestones are
broken, fractured and assured, contain
ing veins of the valuable ores. Along
many of the contacts, and also in the
pOrphyry areas, as well as in the lime
stone itself occur numerous surface
showing veins and seams of quartz,
garnet-quartzite and wire ore, the out
groupings of which parallel, radiate
from, and cross each other in all direc-
tons
While many of these out groupings
indicate continuous veins, there are
found in the limestone examples of
divergence such as branch lines or
shoots making at right angles with the
line Of out crops on the surface. These
lateral shoots in some instances con-
meet with apparently parallel lines
showing on the surface, forming
sort of subterrsnean checkerbOard of
ore with blocks of limestone. The |
general trend of the discoveries so far |
made seems to be in the direction of
broad continuous veins. Quartz is
abundant in many prospects and long
veins can be traced which contain the
metals common to the camp, valuable |
copper ores, iron, gold and silver, and |
lead and silver ores. Quartz, quart |
zite, jasper, shales, pOrphyry, spar, |
every direct on and in very diversi- |
fed conditions. More or less mixed |
with these and frequently forming |
part thereof are found the ore shoots |
or veins containing iron in oxides and !
sulphides, galena, manganese, carbon |
silver in galena, iron and copper; gold |
free milling, in wire and in combina-
tion with all other metals, seldom re-
fractory Indications of casseritite Or |
tin ore have sometimes been encounter |
ed.
The prevailing ores obtained from
the various wo-kings are iron in almost !
every conceivable form; copper in sui |
phides, oxides and car donates, lead, sill !
yer and manganese in minor quantity i
and gold in com bin alton with all other |
metals and also free,
The iron ore occurs in such great |
masses, that it is simply qusrried and
shipped to the smelters where it is in |
great demand as fluxing ore. This iron
pre- in places'carries values which make
it's use doubly desirable. Thousands
of tons have been shipped from this
camp, which have netted S15 to 800 per
ton, taken from the mines doing deve
Iopment work only. In copper ores a
rood average of fifteen per cent has
been m maintained in many car load ship
nent and extensive bodies are already
which carry from 3 to per
cent in copper within 10 feet of the sur
ACE aud containing more or less gold
and silver.
In the iron workings many pockets
IF high grade gold ore have been found
which WELD $500 and more to the ton in
rec gold. The turquoise mines in this
camp are very old, having been evil
lently WORKED by the Indians long be
ore the advent of the white man. In
,he last few years they have been sys-
ematically mined and have yielded a
handsome profit.
The width of the metallic veins var
es as in every other camp but many
bold veins 20 feet wide are encounter
ID, carrying pay values, and almost in ,
rarIsbIy improve as depth is gained.
n most veins, iron, gold and copper !
re associated and where the dOminat-
ng ore is not gold, copper prevails as =
o value.
There are in all about 250 mining