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MINES SL+TWNMN AUlMAN AND 00LDFINLD. 389 UNDERGROUND WATER
<br /> • p.244 As regards underground water, the east-side group of mines is divisible into
<br /> ISABELLA MINE. two subgroups. One of these includes the mines lying on the western and southwestern
<br /> J'r.ASOVCaalccrCL - - y slopes of Bull Hill, particularly the American Eagle, John A. Logan, Orpha
<br /> eoago ,5,rr Ierrndrir7E
<br /> - ����rr�sta�rrc�;ne — -- �Q�shaft ---•-.-"�`� _ -�. May, Blue Bird, and Last Dollar mines. The shafts of these mines are among
<br /> the deepest in the district, the American Eagle shaft being second only to the
<br /> Surf I Lillie (see PI. XI, p. 148), though its sump is 806 feet above that of the Stratton's
<br /> +-:r. +- +• ►, Independence shaft. Notwithstanding their depth, these shafts have had little
<br /> trouble with underground water. This is due to the fact that they were not sunk
<br /> ,aroa ,-:',•:.; •. _' :~ +»r . ` + "' + to their present depth until this part of Bull Hill had been drained by the mines
<br /> ,� '•�+��`� •' + .�+ +�#'.- r '# + + r �'+« and tunnels to the west. The American Eagle, John A. Logan, and Orpha May
<br /> IV
<br /> I„ ' ♦i l ' ' 41��+�+ ' + + 1 t *ice B R E C C I A
<br /> �ODOD f.�`} *�� �a : `+' +4 aid+`� `+.� +, +, ; x p.245 shafts have always been dry... These facts indicate that the mines of the western
<br /> �''. ��� • •, r + ' + �, + r and southwestern slopes of Bull Hill are effectively drained by the El Paso tunnel.
<br /> a �, .• ' . . +el ro+`+ + F ,. "' . , ��; The mines of the second subgroup lie on the eastern slopes of Bull Hill and on
<br /> servo � _ ` '+ = %`++ �'� ~�" : � '+ + ; `�� '�. Bull Cliff. They include the Isabella, Victor, Vindicator, Lillie, Findley, Hull City
<br /> - Y '+ f Placer, Golden Cycle, and a number of other mines of less depth. These mines
<br /> have all had to contend with water, the burden of pumping falling in recent years
<br /> most heavilyupon the Vindicator, which in 1903 was draining the Findley, Hull
<br /> AV
<br /> P 9 Y,
<br /> B R E C C I .A � �CL City Placer, and probably the Golden Cycle. Whether the Isabella belongs to the
<br /> seeo U ' same drainage basin is doubtful.
<br /> Lewes !'¢ p.246 We are forced to conclude that from a practical standpoint the existing
<br /> Cernder wester) [drainage] tunnels do not aid the Vindicator, Lillie, Hull Gity; Findley, and Golden
<br /> szoo Cycle mines. The same statement probably applies to the Isabella mine, which
<br /> may occupy a local water basin having only imperfect flowage connection with
<br /> riscca Lathe-p onolite P ono that of the Vindicator mine.
<br /> ic.45.-•Log4tu4inal promotion of tlho Buetm Vista and Cheyenne veins of the Isabella mine. ISABELLA MINE OXIDATION
<br /> p.391 The original water level was unusually low in the Isabella, 900 feet below the
<br /> 4L collar being the figure given. As a consequence oxidation has followed the veins
<br /> down to the bottom level, 1,100 feet below the collar, though, in the lower levels,
<br /> 10,600 much calaverite was mined with the free gold. In the massive rock on both sides of
<br /> � the Buena Vista incline tellurides were found on level 2, and in places on lower levels
<br /> LEVEL I of that incline the vein is almost free from oxidation.
<br /> 10,400 � ti r^��i
<br /> lot
<br /> r
<br /> 10,000 ,+� + + +r}�f--r— -
<br /> t+ 8 s
<br /> 9.800
<br /> /O 0
<br /> yj r r
<br /> 9,600 ----
<br /> � !2
<br /> Co oz
<br /> 14
<br /> t+,
<br /> k+�' St♦ r\tl
<br /> Lat ite-Qhonolite
<br /> 9.200 - -- - -- -
<br /> Fia. 46.—Cross mrtion of the Tllrnna Vista and East;velIIs at
<br /> the TAe sbalt, Isabella nLine, looking northwest.
<br /> SUMMARY OF DEPTHS AND ELEVATIONS
<br /> FEATURE DEPTH ELEVATION Source: Lindgren W, Ransome FL, 1906. "Geology and Gold Deposits of the Cripple Creek District, Colorado." Professional
<br /> Collar 0 ft btoc 10460 ft amsl Paper No. 54, Department of Interior, US Geological Survey. Page numbers indicated, and emphasis added.
<br /> First Water 917 ft btoc 9543 ft amsl
<br /> Deepest oxidation 1100 ft btoc 9360 ft amsl rDrawn
<br /> :cale: As shown Natural Water Level in the Cripple Creek Diatreme
<br /> Mine Sump (-V1900) 1128 ft btoc 9332 ft amsl A.Brown PLATE 7
<br /> AdrianBrown ate: 2016-07-28 1 ISABELLA MINE HYDROLOGY
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