The Cairo daily bulletin. (Cairo, Ill.) 1870-1872, 1870-07-28

| three thousand feet has been reached. But
the experience in all developed mines of
this character is the same that the deeper
II mine is the richer is the ore. And this
is now fully proven and understood when
we take into account the manner in which
these mines were made, and the variations
in the appearance, weight and texture of
the metal or quartz; for, let il be under.
stood, that all scientific men who have ex-
amned these assures agree that they were
made by an eruption from an interior
cause, the force Of which threw into the
open crevice the molten mass which in it,
cold state we call quartz or collaborating
ores. Now, this top quartz looks like yell
low clay burned, does not weigh more
than four to six tons TO tho cord, and its
porous, honey-comb appearance shows
conclusivcly that, while in melted state,
the heavier ores or mcttle settled down
below, where we find it weighing from
nino TO twelve tons to the cord, which is
| not only heavier but PROFESSIONALLY
| richer per ton than the lighter quartz Of
the top.
There Is IN these mines three kinds Of
Gap or "Trap rocks, one being the clos
ing in Of the walls-which does not often
occur, and soon opens out Another, u
"key rock which has fallen from u
wall above and lodged in the crevice below;
but the most difficult caps is where the
walls stand open and the material
filed in is the same that We
extract gold from, but unchanged by
this action Of water or any other cause,
which change seems to be necessary to pre-
pare II for the process or processes that
We use for extracting the gold; and,
though this "cap rock" does not resemble
the ores, yet We have evidence that it
is tho same. By fire assay, we find 1t
has gold in It; and by reducing it, we
find the ore existing in 1t. Then, again,
We find in the bright ores water coursing
through, or evidence that |. has done SO;
while In the cap rock We do not have that
evidence, except when We find narrow
streak of bright ore, which narrow
streak Of ore yields gold by our process as
does the richer ores above and below said
''caps." These caps" seem TO be no.
cessity for the support and safety Of the
mine, as II Is left In for the shelter Of the
miners below from rocks falling from
above. The ores Of these mines are
blasted out with powder, leaving the
smooth walls standing perpendicular on
either side.
The gold and silver mines of Colorado,
because of many unwarranted specula-
Hons, have been regarded by many MS hav-
ing no real value. Blu, while this may
be truthfully said of some Of the undc.
veloped mines, i,isnot true IN the main
FOR experienced miners in Colorado
have taught Us this established
fart th.'a p,Iao.' ,s~v;- mt expert
'nee In this particular, in Colorado, is only
n keeping with that of all other mining
ON tho globe. Therefore, n
nan need not BE- mistaken in the invest
nent Of money in the mines of this char
'cter; for, first, the evidence is, that u
nine that pays on top invariably pays
better below; and, second, that true
assure vein never runs out
Having these infalliblc proof. to govern
u.s. We may, with safety, invcs, our money
the mining business, knowing that it
vail yield II larger profit than any other
business on this or the European conti-
lent Hear WHIST the London MINING
'o"r"at says abou, the matter:
There can be M doubt but that il min
ng shares generally were more readily
negotiable than they are, they would find | !
nueh more favor among capitalists than !
hey have commanded hitherto-from the {
aueh better interest they pay than other !
Investments. A careful calculation WAS
iade, not long since, which proved that
he three hundred aud fifty mines com.
ri'cd in the mining-share list, paid, on !.
DC average, three times ms large dividends | =
: the average paid by railways, canals, q
ridges w"tcr-works, navigation, sas, @
oek and land companies And when | Il
'''''"NO'' NHN our mines are more / u
han three times u rich MS the mines o,
.hgland aud Wales (as Wa. proven al :,
40 exposition at Paris four years ago. z
hereall the developed mines of the world &C
ere represented, and where Colorado re- a
lived the premium for rchnessl may g
iely calculate on great deal
'rser profit than they obtain from 7
ork'ng the mines in England or any a
'her country ye, discovered" ~
Colorado mines are gaining favor no, W
my IN our own country, but the old "
'orid Is beginning to send over her capital "
'f investment. Two months and IA half d,
80 English capitalists paid for ii
NAT 10 known rs the Troyable
'ode in Colorado, live hundred and
ny thousand dollars. MANY other in.
e'tments have been and are being made r
most daily in the Colorado n;nos m