Grant County herald. [volume] (Lancaster, Wis.) 1850-1968, 1854-02-27

and yellow ochre: north and south sheets
have in some places matrix of red fer
rnginous clay. and in other districts are
found enclosed between solid wall rocks
|of limestone. The horizontal chunk
sheets, which are found in rock No. 3
are associated with fint, oblirs and lime.
stone. The horizontal veins of lead, as.
sociated with carbonate and sui phuret oi
zinc, are found in rock No. a, and gen.
orally in low fiat Openings between the
layers of limestone, and have brown
ferruginous ochery matrix.
Heat.
The heat which has permecated the
lead bearing rocks, and on which depends
the color of the lnatrix of the veins, has
radiated from the aniiclinal lines, and
decreased in inverse proportion towards
The syhclinal lines.
Voitaic Piles.
The elevaiing and abrading forces have
formed the lead bearing rocks into natu-
raj vctaic piles. This principle applies,
lst, 10 The whole Lead Region; 81, TO
the beds OF rock around the mounds; 3D.,
to single ridges, or the smallest basins
of rock.
Lars of Capitalization.
These laws have acted around GEN.
tres, the principle of which are marked
by the mounds.
DIP of Rocks.
The rocks Of the Lead Region dip TO
the centre Of all the ridges and mounds
of the Lead Region The inclination of
the strata varies from ! 10 l5o.
Out-crop Of Rocks.
The outcrop of sandstone, which un-
derlies the upper magnetism limestone,
forms q border along all the principal
water courses which flow out from the
centre Of The Lead Reaion. The ont
crop of blue limestone, or rock No. 4,
forms border which is enclosed by the
sandstone and reaches up towards the
heads Of the rivers; the o,lt-crop of the
flint strata, or rock No. 3, forms bor-
der enclosed by the blue limestone, and
follows some of the spring branches up
towards their fountains. The out -crop
Of the arenaceous limestone, or rock No.
2, forms border enclosed by No.
3. The out-crop of the cap, or rock No.
|, forms still more central border ard
encoses all the beds of blue and yellow
shales. In these out-cropping borders
around the edges Of the lead basins, has
been worked the four classes of lead
veins.
Fired Principle.
The shale beds fill the surface Of all
the large basins OF I1mesionss, and being
e aAiis ..ter stfetl,
or natural roof, for the basins of ore. -
The veins increasing in richness towards
the centre of the bed, and the water
courses rsdiatfng from the roof OF shaie
makes a fixed principle in the geology OF
the lead basins that all the centres OF
metallierous wealth are at points most
remote from the water courses. This
principle applies 20 the whole Lend Re.
gioa, to the districts around the mounds
and to the smallest ridges or basins Of
rock. @
Remarks In Conclusion.
The Lead Region is divided into tw elvt
principal beds or basins: These are cen.
,rally marked by the mounds snrroun.
ding and connecting with these. are small
Ter beds or basins, amounting to severa
hundred in number.
Mining in these lead fields this far
has been done in the smaller basins ant
on the out-crop of the larger ones. One
hundred and twenty-five feet is the dee.
pest workings that has yet been DONE
The value of the ore prodllced from these
beds since these mines were first disco
vered may be set down at about thirty
millions Of dollars. The most reliable
evidences prove that, this amount of ore
will net include more than one half pei
cent. of the ores which these beds vii
contain. This at the present rate of mi
ming will not be exhausted in several
thousand years, and has been discovered
through the science of Geology, by first
noticing that the rock dipped from the
water courses. ]. Y. PHILLiPs.
Grant Co. Wis, Jan. 81, 1854.
IJThe ealer OF the common green
1t u 4 g. !