Bisbee daily review., 1904-07-13

, rious mines with the view of operat- ing them as a unit admits of many economies that would not be possible under individual ownership.
 The Tombstone ores are of com plex nature and vary in tenor of
 precious metals. Usually they carry more or less lead and zinc. with which the gold and silver are associated.
 Below the water line the oxdized ores give way to ulphides-galena,
 blende and pyrite. In some of the mines manganese is an important
 gangue material, and it's origin is a
 matter of considerable interest, as 1t
 has been definitely traced to the pres ence of alabandite. or manmanese sulphide. This uncommon mineral
 was found in quantity On the 35o-foot
 level Of the Lucky Cuss mine. where it had been preserved from the de- composing action of Altering waters by a dike While the chief value or the ores is in silver, the relative pro portion of the precious metals ranges within wide limits. Records obtain ed from the old mining companies show that the Assure veins as ruie were richer in gold than the bedded deposits and also that the tenor ID this metal increased with the deptn of the workings. In the Contention lode the ore has carried as high as
 sl0o in gold per ton. while the lower levels of the Grand Central the aver age was between s65 and SIP per ton. Such high values are, hoWeset, rather unusual IL is estlma1eo lna' the ore mined throughout the oiseIles has averaged s45 per ton in soid anu silver - .,,o+ has confronted the present conlpaHy m its a+.empts to revive mining ope-" tions at Tombstone is the dralnase of Inc territory. As has been delloA- strated by previous experience 'n ,,rae-rrolnd water lies in basin ol graat area and enormous volume :t. e',,tsrranean channels that permit llo so1,. iron, one part of the area 'o a.-
 ether The pressure of such poa; os ,,-a+.r under the conditions IS uin ,, o..,. n exnlain The annual ralhla1 ~ Iro,,hstone is extremely light anu
 nrecipitation drains immeol@'eis ,;aI,a
 streams owing to impervious cai-on o- natural cement at the surlace ing the seventeen years alter n-as etoDped by the contention coipa
 4,a water never returned 'o nia le,-al by several feet, a 1acI ni. ;nS;catas apparently that the
 ,nt- ,nt-or i- annarently an ancient one
 Tha whole burden of handing lne .baft The installation was planned after a careful stuus ol .t
 r-ater in the mines is born Dy 'he r,roblems involved and has pro'ee fully equal to the task me s,-n- has four compartments, two TOT Pulnp ing and two for hoisting, and measui bv 22 feet inside the umDers'
 s+eoi head frame 79 feet high and 5o i feet wide rests on concrete piers oEei
 the shaft The hoisting facilities H. cIude a double reel engine with cyllh- ders for a fla rope. 16 by 6O lncnes' and an additional engine for nanulus
 the pumps which is capable oi llilinS
 q weight of 30 tons. The shalt anu hoists are designed for mining 10 denth of 1000 feet. Pumping is done in two lifts. The main station ls on the 100-foot level, where there are two Prescott threatening triple eA-
 mansion pumps capable of raising 1,fOo gallons Der minute, or 60 per cent
 more than the combined capacity o1 the old Contention and Grand Central
 plants. In addition there are two
 pumps of equal capacity on the 60o- foot level held in reserve. The pumps
 at both stations feed in single main' Four sinking pumps of 2,4OO gallon capacity are maintained at the water line and are connected so as to raise the water to either station. The duph- icate installation provides against in terruption and at the same time gives
 a reserve capacity sufficient to cope
 with any thrush of water that may come unexpectedly. At present the pumps are throwing 2,350,O0o gallons
 per day. and the water is being lowe-- ed at the rate of 6 feet per month.