cori'Hh' (j{ i':i':.\ .w/.va; 121 



thick swain|) deposit ot" decaying \('<;('lati()U wliicli ultiinatclN' hccainc 



a most valuable Ix'd ot" coal. 'I'hc stiimi) was left in the root' of tlie mine 



wlieii tlie coal was extracted for commei-cial and domestic uses, it 



fell to the floor years after the ii;allery had been abandoned and was 



discovered only throu«»;}i the clnuKic visit of a miner. 



Half way down on the (vist side is a desk case containin«i; a series 



of rock s])eciniens illustratin<>; the <>;e()lo«!;v of Manhattan 



eo ogy Inland. This is arrani^ed i2;eoi2;rapliically and shows the 



Manhattan . ,. ^ , , , ,. 



jgj^jjjj more pronnnent features 01 local geolojiy irorn south to 



noith. 

 The northeastern corner of the hall is devoted to the Copi)er Queen 

 Mine Model and a series of ores and other specimens from 

 M-^^^M H^f° the famous Bisbee-Warren copper district in southern 

 and Exhibit Arizona. Two models have been prepared as a result of 

 several years of extremely painstaking and skillful work. 

 A large model, some 18 by 12 feet in dimensions, shows on a scale of 

 twenty-four feet to the inch all the surface features and mine and other 

 buildings over four of the principal mines (Holbrook, Spray, Gardiner 

 and Lowell) belonging to the Copper Queen Consolidated Mining Com- 

 pany, while a painted background represents the surrounding mountains 

 and the town of Bisbee. The sides of the model give vertical sections 

 to the depth of about 1200 feet illustrating the geology of the area and 

 showing the general manner of getting out the ore and hunting for new 

 deposits. There have been produced in about 30 years (1880-1912) 

 from the mines at Bisbee belonging to this company 7,729,922 tons of 

 copper ore of an average copper content of 7.16%. The metal pro- 

 duction in this period was 



Copper— 1,106,605,774 pounds (553,303 tons) 

 Gold —104,775 ounces Troy (8,731 pounds) 

 Silver —6,107,421 ounces Troy (508,952 pounds). 

 Near the large general model there has been installed a small model on 

 a scale of six feet to the inch showing the usual methods of extracting 

 the ore by "stoping." Drilling, picking, timbering, filling old cavities, 

 transporting, raising ore to the surface and other operations are illus- 

 trated as w-ell as is practicable on the scale adopted. The shaft is 

 equipped w ith its cages, which are arranged so that they go up and dow^n 

 by means of automatic machinery. 



Specimens of ore, minerals and rocks from the mine and the adjacent 

 country illustrate the geolog}^ of the region. Chief of these specimens are 

 velvet malachites that w^ere taken from the original ''Queen" mine, the 

 Open Cut, in the early eighty's and a great block of malachite and azurite 

 weighing about four tons taken from the Mine in 1892 and exhibited in 



