The Washington times., 1913-12-30
RICH DEPOSIT OF TIN
FOUND IN SOUTHWEST
North Of. Deming, N. NJ, Is Found
a Lode by inexperienced
|: Men, Who Beat Old Guard.

Ell PASO. Tex, Dec. 30-The re-
ported recent discovery Of tin ore in the
south end of the Mimbreo range. north
of Deming. N NJ. was made by mex
perienced men in a section over which
old-time prospectors and miners had
carefully prospected for over thirty
years. There are few minerals. says IN
expert mining engineer. with which the
average American miner and prospector
has less practical acquaintance than
with tin, dnd for the good reason that
up to date there have been no import
ant workings or shipping tin mines In
North America.
The local occurrences Of tin. with few
exceptions, are better known to the
mineralogist and geologist than to She
practical miner. The miners on this
continent who know tin" are mostly
Cornish. In America tin IL more IA
miliar to us in connection with the tin
plate and canning industry than In
mines or veins.
Geological conditions exist oil over the
Southwest and Mexico similar to those
in Cornwall. Australia, Tasmania. the
East Indies; and Boliyia; wnsre n,ne Mase
ical formations favorable for tin are
principally granite. states. and intru-
sions Of igneous rock, such as porphyry:
Veins carrying the ore are called
greissn. a species s, 1r.onn OF Degmau;Ie oor or
granite regions, consisting principally of
Quartz with mica. The minerals COM
monty associated with tin are black
tourmaline, or schori, and mica, garnet.
apatite. nourite. iimentie. moiybdenitei
Some of these accompanying minerals
are very like tin itself and have been
mistaken for tin, causing Some tin-bear.
ing veins to be accredited with more OF
Tin, when found In veins, is generally
IN fair-sized crystals like garnets. or In
grains disseminated through the rock.
It may also occur massive or In con-
cretions with rounded hotryoidal Grape
wood tn" Crystals of tin occur as
square pris.ns and pyramids, often In
twins. A rock containing disseminated
tin or tin ore is called "tin stone" Cas-
sitertie or tin stone y in tin dio5tde.
cent Of metallic tin.
Crystals Of tin are Of q splendent ada
mainline color, luster Of q rich brown
to nearly black color: and not unlike
Of high or high specific srsvity OF tin.
which Is Z. together with its hardness.
which Is SIS. to z. readily distinguishes
It. 1t may also be detected by grinding.
mixing with sodium carbonate. and
roasting on charcoal. Small giobules Of
white metal are given OF. which are
malleable under the hammer and are
harder than silver. which they resemble.
In nitric acid they are oxidiged to an
insoluble white powder. Another test
is to melt the metal out OF the rock,
place one end between the teeth and
bend the metal with the fingers, and Il
will cry" az the Cornishcnen call the
sound.
Tin has been found in San Bernardino
county, California; Harney Peak, near
Deadwood. s. D.; Mt. Frankl'n and the
Quitman mountains Of FL Paso county.
Texas. It is also found IN AlAska ana
Mexico. The new discovery In Luna
county, New Mexico, may prove to be
the first discovery Of tin IN commercial
quantities in the United States.
Quicksilver, weighing LOO pounds, is
being daily produced by the sunfower
Cinnabor Mining Company at the mines
seyenty-five miles northeast Of Phoenix,
in the Mazatzal mountains, Arizona.
High-grade ore Is being mined from
four adits and the product win be sent
to the New York branch Of the San
Francisco firm.