Bisbee daily review., 1917-03-04
TRENCH|NG VERY SUCCESSFUL
 NEAR HERE
Bisbee-T tombstone Copper Mining Company to Sink Two Shafts-Has Uncover ed Fine Carbonate Ore.

Bisbee-Tombstone Copper Mining company is preparing to sink two shafts on it's property west and north of the Warren District. At a meeting of the directors of the concern. held this week, it was decided to sink fur ther in a shalt which is already down fifty feet and. on the other side of the hill, to sink another shaft.
 In addition the company has been following the recommendations. in part. of Y $. BOnillas. well known geologist of the District He advised the trenching of part of the holdings of the company and this has resulted in the uncovering of some excellent carbonate copper ore.
 The report of Mir. Bonillas on the property follows:
 Area and Location.
 The property of the Bisbee-TOmb- stone Copper Mining company that was examined consists of 27 unpat- ented claims situated about eleven miles northwest of the city Of Bisbee. Cochise county. Arizona. The new road between Bisbee and Tombstone goes through the western edge of the group, and the nearest railroad point is Hereford. eight miles away. on the main line of the F.. P. & s. W. Rail- way. There is a wagon road to this point.
 This ground is located on the north western edge of the Mule mountains. where the plains of the San Pedro valley begin.
 General Geology.
 The group centers about a hill of Devonian and Carboniferous lime stone, Gin claims ?. 3 and 4). over 1500 feet long from east 10 west and 800 to 500 feet wide. Surrounding the hill. bedrock is covered by gravel and sands except at the extreme south western edge where other hills of Carboniferous limestone are reached. The lime beds dip in general to the north and northwest. from l5 to 30 degrees. and here form a part of the northern side of the great uplifted dome that centers about the Juniper flats granite. The limestones of the producing Warren Mining district bear the same relation on the south east.
 Gran ite porphyry is to be found directly west and south Of the group, and as it is quite abund- ant in the hills to the south, it is likely to be found on the claims GOV cred by wash. 1s-
 Special Features
 At the west and east ends of the hill mentioned the top Devonian beds are exposed on the surface and al- though unaltered in general appear ance. on close examination they are seen to be traversed by very many thin stringers of malachite. azurite and calcite. and where the veinlets are thicker. chalcocite is found in place of the copper carbonate The presence of the sulphide. as found seems to indicate that the mineraliza- uou is not due to surface cold solu- tons. but to deeper sources. One of the chalcocite stringers found in a lit. lie shaft at the east of the hill. shows a mass of sulphide fully foot and half in diameter
 Deyonian limestone mineralized in this way has had sufficient copper values in parts of the Warren District this limestone ore has had connection with vre bodies of higher grade.
 Other features of the limestone ou this bill are the slight folds. and breaks some of which strongly silici- fed while others show cTumpled and altered limestone. now kaolinized. The shaft on the east end of the hill was put down on one of these slight folds snd bresks. and all the calcite filled
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