112 COPPER QUEEN MINE 



\)\ this volcano and by the Soufriere of St. Vincent. Nearly 30,000 people 

 were killed by those outbreaks. Important geological facts were learned 

 from the observation and subsequent study of the series of events. 



An attractive case is that containing some marvelously beautiful speci- 

 mens of calcite, aragonite and gypsum from the famous 

 C M t ' 1 s ilver-and-lead mines near Santa Eulalia in the vicinity of 

 Chihuahua, Mexico. These specimens are remarkable for 

 the perfection of their crystalline form or the delicacy of their fibrous devel- 

 opments and for their colors. 



The northeastern corner of the hall is devoted to the Copper Queen 

 Mine Model and a series of ores and other specimens from 



opper yueen ^ ie f amo us Bisbee-Warren copper district in southern .Vri- 

 Mine Model i i i ^ 



and Exhibit zona - l w ° 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, Gardner and Lowell) belong- 

 ing to the Copper Queen Consolidated Mining Company, while a painted 

 background represents the surrounding mountains and the town of Bisbee. 

 The sides of the model give vertical sections to a depth of about 1200 feet 

 illustrating the geology of the area and showing the general manner of get- 

 ing 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 production 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, trans- 

 porting, raising ore to the surface and other operations are illustrated as 

 well as is practicable on the scale adopted. The shaft is equipped with its 

 cages, which are arranged so that they go up and down by means of auto- 

 matic machinery. 



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

 country illustrate the geology of the region. Chief of these specimens are 

 velvet malachites that were 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 the 

 Arizona mining exhibit at the Columbian Exposition in 1893. Enlarged 

 photographic transparencies give details of scenery and mining, supple- 



