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Volume 24 (1872) (424 pages)

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Page: of 424

SCIENTIFIC PRESS) [March 2, 1872. 130
Causes of Depression of Placer Mining.
In the chapter ou the condition of mining industry in California, in Mr. Raymond’s last report, ‘‘ Mines, Mills and
Furnaces of the Pacific Coast,” of which
we have the advance sheets, Mr. W. A.
Skidmore contributes some interesting
facts concerning the placers of, this State.
He sums up the causes for the inactivity
in past years in placer mining as follows:
Ist. The injudicious system of locations
permitted under early mining laws and
regulations, through the ignoranee of the
miners of the character, extent, and depth
of the ditrital deposits. These locations
were generally made in claims of 100 feet
frontage, running back to the center or
backbone of the nearest ridge, regardless
of the course of the deposit, such claims
being too small to justity the expenditure
by individual owners of the large sums
necessary to construct tunnels for outlet
and drainage of their ground.
2d. The filling and choking up with tailings, after a few seasons of washing, of the
ravines, gulches, and rivers which served
as outlet for the ground, thus preventing
the maintenance of fiumes of sufiicient
length and grade to disintegrate the hard
cement found underlying the top dirt, and
rendering imperative the construction of
long tunnels to the nearest deep stream,
requiring, in some cases, years of labor
and the disbursment of large sums without immediate returms,
3, The ignorance of the people and of
capitalists of the unbounded mineral resources of their own State; the sudden and
unhealthy excitements following the discovery of gold in British Columhia, and
silver in Nevada; and the efforts of a portion of the press in California, in the interest of land speculators, to ‘‘ write up”
agriculture at the expense of mining.
4th. The uncertain tenure of mining
ground under local mining regulations,
which differed in every district, and affords
no adequate protection to the purchaser of
mining ground unless he remained in actual
possession,
Prospects for the Future.
In speaking of the future of this branch
of mining Mr. Skidmore says:
Many causes have operated to confirm
me in the opinion that the future is hright
with promise. A more lively interest is
felt by capitalist in the examination and
development of these dormant resources,
and the information disseminated through
themedium of the ,State geological survey, and the various reports of the United
States mining commissioners have not
been without effect in turning the attention
of the people to the vast stores of wealth
at their very doors. One of the most encouraging features of future progress is
the tendency of consolidation and cooperation on the part of owners of mining
ground, who are availing themselvee of
the recent act of Congress to acquire a
atitle in fee simple to the land by means
of a United States patent. As an instance
of the beneficial operation of this law, we
may mention the fact that one company,
the North Bloomfield Gravel Company,
of Nevady County, are now applying for
a patent to 1,500 acres of mining ground,
lying between the Middle and the South
Yuhariver. Should this act be liberally coustrued hy the various land offices, and no expensive obstacles placed in the way of the
miner seeking to acquire title (as wus the
case in the operation of the act for acquiring title to quartz ledges), much good
will result to the State from the passage
of thie law.
Important improvements have been
made in the manner of using water in the
hydraulic diggings. Instead of projectfive hundred to one thousand inchee of
water through two or four pipes, the
leading mines nowrun their water through
one pipe by means of the recently invented
hydraulic nozzles, and discharze it with
immensely increased momentum and
effect against the bank they desire to wash
down, accomplishing greater results with
less labor and expenee, and "enabling one
miner toregulate the discharge of a thoueand inches, in streame of six inches in
diameter, by means of a lever, moving a
nozzle which turns in any direction, with
more ease and accuracy than three men
could do itby the old process. So powerful isthe force exerted by these large
streams; uuder great pressure, that man
cemented gravel banks which formerly required the use of powder blasts before
washing, can now be cut down and removed by the action of water alone.
He then specifies a number of drills,
hydraulic pipes aud the mechanical appliances of mining and improvements in the
manner of working, and says: As these improvents are adopted, the amount and
profit of this branch of mining increases,
and the steady operation of these causes,
inelnding the facilities for the procurement of title to mining gronnd, will have
a tendency to materially increase the gold
product.
Underground Temperature.
Late observations, embodied in a report
to the British Association, confirm the results of former investigations touching the
rate of increase of temperatnre with increasing depth. The average appears to
be about one degree of Fahrenheit to every
fifty-four feet of depth; though in some
localities the increase is much more, and
in others much less rapid. In the Mont
Ceuis tunnel, for example, ata point directly under the summit of the mountain,
which is quite a mile overhead, the temperature was found to be 85.1 deg Fahr.
The mean aunual temperature of the crest,
as estimated from a comparison of observed temperatures at both higher and
lower levels, is 27.3 deg. Fahr. Assuming
this estimate to be correct, the increase of
temperature downwards is at the rate of
1 deg. Fahy. in 93 feet, which, by applyIng a conjectural correction for the convexity of the surface, is reduced to about
i deg. Fahr. in $1 feet, as the corresponding rate under a level surface; and this is
about the rate at the Dunkinfield colliery
in England, though much lower than the
average elsewhere observed.
A more rapid increase than the average
given above has been observed at Yakutsk,
in Siberia, where, according to Middendorf, the temperature runs up at the rate
of 1° Fahr. in 49 feet of descent. Dana
mentions that Magnus found in the same
locality a gain of 15° Fahr. in descending
408 feet, which is equal to 1° for 27 feet.
It is stated on the authority of Geueral
Helmerson, of the Mining College at St.
Petersburg, that in sinking a well to the
depth of 540 feet at Yakutsk, the soil was
found to be frozen the entire distauce, and
the probabilities were that the frost had
reached a depth of 700 feet. One degree
of increase in 52 feet of descent was the
rate in this well.
It is found that the rise in temperature
as the thermometer descends is not always
regular, being more rapid at some depths
than at others. Thus, in the examination
of Shergin’s shaft, in Siberia, between the
depths of 150 and 200 feet, the temperature
rose at the rate of 1° in 20 feet, while between 250 aud 300 feet the increase was at
the rateof 1°in96 feet. A similar, though
less marked difference, has been observed
in the Kentish Town well in England.
Between the depths of 325 and 910 feet,
the rate of advance in temperature is 1° in
56 feet, and from 910 to 1,100, 1° in 54 feet.
The strata differ materially in the two
spaces, in the upper space consisting
mainly of chalk and marl, and in the
lower space of sand and clay; whence it
hae heen suggested that the irregularity of
the rise in temperature was due to the
varying character of the strata traversed.
Goup Mryine on tax Contorapo.—The
Deseret News has a correspondence at St.
George, who writes, February 5th, as follows: Parties are just up from St. Thomas,
on the Muddy, whe report considerable
excitement in that section ou account of
the discoveries of placer gold diggings on
the Colorado, above the mouth of the Virgin. The precious metal is found in the
fine or flour state and itis reported that
half an ounce is made a day to the hand.
Several parties numbering in all near fifty
men, have made au outfit here and at the
Muddy and gone over with three months’
outfit to work. The spot they have selectedis above the mouth of Grand Wash,
near the mouth of Diamond river, probably from 75 to 100 miles either from St.
Thomas, St. George or Kanab. Parties
have visited and prospected various places
along the river, as wellasthe spot described and say that there isfine gold in the
sands all along the river. The parties seem
satisfied that they havea good thing and
that the Colorado will be lined with mining
camps ere another winter sets in.
Tue receipts of the Patent Office at
Washington, last year, were $678,716, and
the expenditures $562,104. The balance
was paid into the Treasury, amounting to
Y. $116,624, making the balance to the credit
of the office January Ist, 1872, $759,970.
The number of applications for patents
was 19,472; of patents granted, 13,333;
and of patents expired, 2,654. The whole
number granted to citizens of the United
States was 12,511.
Winnemucca Silver Mines.
It may not be generally known, says the
Humboldt Register, but it is nevertheless
a fact that the mines in Wiunemucca
mountain, so far as they have been worked
have tnrned out as good resnits, if not a
better showing than any of the mines in
Humbold county or in the Eastern part of
the State. Within the last three years
there haye been over a thousand tons of
ore taken from the Wearmouth, French
and Kunkle claims, the three principal
locations in the district, and shipped to
Rye Patch, Reno and San Francisco for
reduction. The receipts of the millmen show that this ore gave an average
yield of $150 per ton. Some thirty tons
of first-class ore taken from the above
claims, which are located on the “* Pride
of the Mountain Ledge,” milled as high
as $500 perton. Also, some 250 tons shipped to Swansea went $143 and some cents
per ton. Are there any other mines in
Humboldt county that have as yet made
a better showing? The ledge proper,
from which this ore was taken is about 4
feet hetween casings at the bottom of the
incline, 200 feet from the surface, showing a stratum of 40 inches wide solid
mineral. From the ore already worked,
it isa well-established fact, that the entire ledge between casings is a true fissure
vein, and will work over $100 per ton all
through. In order to satisfy the curious,
we give the numher of the assays made by
two experienced aud practical assayers:
The general average of 16 assays of different lots of ore as made by J. A. Allgauer
was $271.79 per ton. That of 20 assays
made by the Cahill Bros., of Austin, Nev.,
was $235.45; the highest being $2,389.03
and the lowest $28.85. Where is there a
ledge in this part of the State, that does,
or can make a better exhibit than the
“Pride of the Mountain.” The Eureka
ores are very base and low grade and
some twohundred miles off the railroad;
the South Mouutain (Idaho) ores are
about the same as the ores in the Eureka
district, and located over two hundred
miles north of the C. P. Railroad in a
country where snow is four feet deep six
months in a year.
Tt may look a little strange to those unacquainted with the cirenmstances, that
with such a showing the jledges are not
worked. The reason is obvious. The
ledges are owned hy men who are unable
to erect proper reduction works, and they
have learned by experience that ores paying less than $150 per ton, will not pay
the expense of shipment and reduction,
and leave any margin for the mine owners,
If the ore could be reduced at or near the
mines, even $50 ore could be made to pay
a handsome profit.
OakKVILLE QUICKsILVER Minz.— We
visited, a few days since, the Oakville
Quicksilver Mine, situated some fourteen
miles ahove Napa City, and within one
mile and a half of the Calistoga Railroad.
The company have excavated 3,000 feet of
tunnel, and drifts have been run, which
denote a rich ledge of 1,500 feet, lying between sandstone and slate. There are
about 1,000 tons of ore on the dump, and
at least 10,000 tons are developed in the
mine. A lare amount of pure cinnabar is
now being discovered in the lower tunnels,
and, in the opinion of experts, the leads
will eoon open into chambere of the same
ore. The price of this ore varieein value
from $40 to $800per ton. The Company
lately started a ten-ton furnace, which
works splendidly and is now turuing out
some 400 pounds of quicksilver per day.
It is the intention to erect a furnace of
much greater capacity when the yield of
quicksilver will be proportionately inereased.—News Letter.
Starce.—There seems to be among the
imports into our State none so needless as
that of starch. With soil that produces
so bounteons a yield of the raw material,
California should be exporting instead of
importing it. Other States with less advantages ship starch to foreign ports
while we import over $150,000 worth
per annum. Ajlate Indianapolis paper
aunounces the shipment from that city of
two thousand boxes of starch to Liverpool
via New York. California could land it in
Liverpool at an equal if not lower cost for
freight than Indianapolis, and certainly
our advantages for cheap manufacture will
enable us to furnish it ready for shipment
at a much cheaper rate. We wonder that
some of our farmers have not ere this
started a co-operative starch factory to
dispose of their surplus produce.
Mzouanics, write for your paper.
Nevada’s Bullion Product in 1871.
The Virginia City (Nev.), Enterprise,
says: When we predicted, more than a
year ago, that the bullion product of Nevada for 1871 would exceed twenty millions
of dollars, most of the journals of California treated the assumption as a pleasant piece of bombast. The complete fig-ures are not before us, but from a carefully prepared statement by the General
Agent of Wells’ Fargo & Co., we are satisfied that the bullion product of Nevada
amounted to not less than twenty-five millions of dollars during the year 1871,
This equals the gold product of California, and henceforth we shall claim for this
State the first rank as the gold and silver
producing commonwealth of the Republic.
Assuming the product to be twenty-five
millions of dollars, and a simple calculation shows that $536 in gold and silver
was extracted from the earth and put in
circulation by every man, woman and
child in the State. The amounts shipped
by Wells, Fargo & Co. from six of the
principal districts of the State during the
year 1871, are as follows:
PLACE. AMOUNT,
Virginia and Gold Hill,.. e+ 11,053,328.28
Pioche «. 3,982,227.89
Eureka 2,173,105.50
Hamilton and Treasure Hill... 1,339, 420.33
Austin ., 26).: oss codes ee 965,536.17
Mineral Hill.......... 701,014.00
Total. weet. ee eee $20,214,632.17
Tt is well known that the product of the
mines of Virginia and Gold Hillin 1871
was considerably in excess of $11,053,328.
The yield, as shown by the books of the
County Assessor, exceeded this amount by
about two millions of dollars. The statement of the General Agent of Wells, Fargo
& Co., was doubtless compiled from the
shipments by that Company, and does not
embrace a number of district from which
very considerable amounts of bullion were
taken in 1871. A large amount of base
bullion has been shipped directly to the
East for separation, from the eastern counties of the State. Much of this is not included in the statement referred to, ag it
was not shipped through Wells, Fargo &
Co. It is therefore reasonable to assume
that the gold and silver product of Nevada for 1871 was all of $25,000,000, and
that for 1872 it will exceed this amount by
$5,000,000. ~
Manzanita.—This seruhby bush (for it
seldom attains the dignity of a tree) is well
known to all old Californians, who are Californians enongh to have visited the beautiful mountains of the State. The wood of
the manzanita is hard and susceptible of a
beautiful polish. In early days a man who
did notcarry a walking-cane made of manzanita was not exactly inthe fashion. Such
canes became too common however, to continue the rage in California; like ‘‘specimen
jewelry,” they were valued only as presents
to he sent East. No one in these days
hears of a great man being presented with
a manzanita cane which has a gold head
quartz setting. The pioneers of the mountains at an early day discovered that the
manzanita made a most excellent firewood.
It makes the hottest fire of any wood to be
found in the State, or perhaps any to be
found in the world. There is a drawback,
however, to the qualities of the manzanita
as fuel. It makes too hot a fire for the
stove of the period, It burns out a etove
too rapidly for economy. In an oldfashioned fire place the piled manzanita
logs with brilliant flame, lively sparkle
and glowing coals make all the comfort a
fire can make, of a night when thé thermometer is coquetting with zero. So the
large manzanita bushes have been cut
away from the hillsides near mining
camps. .
The Digger Indians have always used
the berries of the manzanita as food.
They contain a large percentage of grape
sugar and are rich in gluten. Manzanita
grows all over the mountain sides of California, on the Coast Range, and on the
Sierras. It grows from low down,in the
foothills to an elevation of 3,000 feet. The
production of these berries is therefore
practically unlimited, as nature has arranged it. What can be done by cultivation ?—Grass Valley Union.
Inox Suips.—In one ship-building establishment in Philadelphia there are five
first-class iron steamships in process of
construction, with an aggregate tonnage of
13,000 tone, which will require for their
construction 16,000,000 pounds of iron,
and the ships when completed will cost
$2,500,000.