New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1880-12-27
LEADVILLE AND IT'S MINES.

THE ORE-yEINS OF CARBONATE HILL.
BAD EFPEcIs or DISPUTED MINING CLAI"s-UN-
CERTAIN PROSPECTS OF THE LEADvlLLE COM
pANY-MINEs IN THE NORTH sBUT-sURPRIs-
ING DEVELOPMENTS N THE MORNING AND
EVENING STAR MINIS.
tFRox A STAFF CORRESPONDENT OF THE TRIBuSE.l
LEApyjILF. Coi Sept. 2O-The geological for
nation of Carbonate Hill IS much simpler ana more
easily understood than that of Fryer HILL In the
former there is a well-iefned contact between the
porphvrv and the limestone, the porphyry lying on
the latter and both dipping into the hill toward the
east at an angle of about 200. The natural
| outcrop of the contact would be well pom the slde
| OF the hill. but, when the mountains were thrown
| up or subsequently, the underlying rocks were
removed from beneath. and the upper part OF the
| contact fell down To obtan-an idea of the char
acfer of this fault" suppose that end OF long
board is set firmly the ground, the other end pre-
| iecting at an angle of 90 with the horizon. and
held in place without support, by the rgidity OF the
| plank Now if the board should be partially sawn
through three or four feet from its upper end, ITS
| weight would cause the partially detached piece 10
fall down, to form an angle with tn remainder
| of the board. In the same way as the strata Oh
/ rocks living at an angle in Carbonate Hill ap
proached the surface and were deprived OF their
suppor they fell down 50 tat near The foot OF the
mountain the plane of contact seems - pIcA out Of
| the hili, while higher up it plainly pitches H.
As the ore on Carbonate Hill lies in the contact
between the porphyry AM The limestone. 1t follows
! that the largest bodies Of naturally found IN
| the contact where the rock is in place rather than
| nearer the qulch and below the fault. That any
| ore at all should be found below the natural out
crop was thought very remarkable before the pecu-
| liaritias of the formation were understood, ana
when Judge Penderv struck into body Of caioo-
mates more than a hundred feet below the line OF
! mines that were located on the outcrop, his DIS
covery was almost mex licabe, and people thought
that he had found second and ioUer contact
| when in fact he was working IN a portion OF the
only contact on the hill, but in part OF 1t which
! had broken off and fallen down.
Sixteen months ago It was popularity supposed IN
Leadvle, although presume that the managers OF
mines knew better, taat whereyera contact between
porphyrv end limestone was found, there ere would
be discovered. That delusion has now been di>si-
plted. Inc mineral deposits. when they arc found
IN formation ike that of Carbonate Hi, are Al
ways III the contact out the ore occurs in sbutcs or
streaks through the contact, aLds bounded on both
sides by barren ground.
DISPUTED MINING CLAIMS.
The first ore shute discovered in the Carbonate
| Hill contact was that on which the Carbonate
| and Shamrock mIne' belonging 10 the
Lea2viIe Mining Company, were located. sup
poslur that there would be no question about
the Interpretation of the law which gives the DIS
coverer OF mineral vein the right TO follow It ID all
its FPS. angles and spurs wherever 1t may Lead me
| discoveries OF these mines LAID them ont parallel
/ with the outcrop. TINS securing 1,5OO feet OF
ground along the edge of the plane of contact,
| thinking that, no matter how narrow the strip OF
ground which contained the apex of the vein might
he they would be allowed 10 follow it into the hill
| withcut any reference % the side lines of their
claims ii the ore shutc had pitched directly into
! the hi on the plane Of contact between the poT-
! uhvrv and limestone. the contest that very soon
arose bet yeeu the of the first miues located
and those that sub equgntly stahed on for the
purpose of getting The as soon As 1t passed De-
yond the side lines OF the originh ella ms would
probably have been postponed ana II certainly
| would have been slmptted.
But while the p,tch of the contact carrying the
ore shu Is almost dine cash. the strike OF the ore
ehute itself is northeast. II the reader would nm
der.taud how tuIs bic, let him lay book on
the table viii it's back from him. II he raises tAc
| cover which Hes uPpermost TO an angle Oh ~ IL
will In that position represent the pane o. contact
| between the porphyy aud the limestone Now. 4
| he laws straight stuD OF paper. two inches WIDE.
diagOnay across Inc cover of the book, sim hed 40
IN angle OF 2Oo causing in to extend from the upper
ught-hanu corner ln LIou1 10 Wv '""c' '0'' manu-
corner H. the rear that strip viii repr sent the ore
sbute and its relation 10 the plane of contact
The nearest neiehbor which the LeadYille Mining
| Company has j. the Liit!e Giant NINE Which Is
a." shape part ofitiyng east OF above tIe Var-
Donate ard shamrock mines and part Hor'h Oh '"e
former. A. the ore sAute IN the OaIu''"'' '1lH'
began nearer tne northern 'h'h lhe I'n'r' Gnu ~
the claim aud tooA nortAFt'eil u4leol''H' u SUN
ran over into the portion Oh the LINE "'lhl ""''n
| lay on IT'S northern end, ana sul'A were az Once
! begun which not only caused the explorations IN
the vein To he suspended. but involved the company
in great expense.