Bisbee daily review., 1914-12-13
BISBEE MINE HEAD
 TELLS OF MINING
 METHODS IN VOGUE
In Article in Mining J0urnal He
 Tells How Copper Queen Has
 Treated Mining Problems - Interesting Technical Story.


 One of the chief attractions of the . November issue of the Mining and Engineering World. third issue, !. is an article contributed by Joseph Park Hodgson mine superintendent of the Copper Queen Consolidated Min ing coupany, Of th!s city. and touch. ing on the methods Of mining used in the development and working Of the Copper Queen mines in the Warren District Since the nature of the ar ticlc is wholly technical it is not re printed here in full, but summary of the main facts of the article. and several small and highly interesting excerpts are herewith given
 The article opens with a descrip- tion of the mines formation and the occurrence of the ore bodies. The matter is treated briefly. but fully. The underground haulage and hoist ing is handled wherein appear the following stotements
 The underground openings have been extended in the neiehborhood of 200 miles. The ore is hoisted at centrally located Sacramento shaft to which it is conveyed from different parts of the mine by electric haulage. There were slightly over 9 miles of electric tramway in operation in 1913. The hoistng levels are 200 ft. apart, commencing at the 4OO-ft level and continuing down to the 1GO0, the av- craze hoisting distance being 1000 tt, Kimberly skips gre used and are loaded from pockets As high as 400 sldps have been hoisted through this shaft in 1-2 hour shift
 Lighting and the compressed air system fthe mine are then taken in their order and briefly described. Fol lowing is a description in length Of the several manners of mining which have been used iu the Bisbee prop critics in the past. and some which have never been used until lately and are at the present time just getting ther first real tryout. These methods include the square-settiug. cut and fnl. shrinkage. and top-sicing. and each is treated with the same care and full description of results and pos abilities.
 On the conclusions as to the sev- eral mining systems in vogue Mr. bHodgson says:
 It is quite evident to the writer that in future developments in these prop critics, wherever ore bodies are de- yeloped which are adapted 10 top- slicing. cut-and-hn. or shrinkage meth ods. these methods will be found to ! be much more economical than the square setting which has been in vogue almost exclusively in the past l lt must be remembered, however, that the square-set method will al- ways be used for a large portion Of ! the ore in these properties, because it undoubtedly has some advantages un- der varying conditions that the other systems do not have.
 Follows then a short description of the ventilation system and the con l crete pockets and ralsers Tor ores. ] Other small items which are handled at the end of the article are very in- terestng for the facts they contain of which the general person without a knowledge of the whole of the mme ! knows nothing They are:
 An interesting feature of the mine is that at present large areas of old
 stopes are bang worked and ore which was regarded as waste in for. mer years snow mined at 9 profit A large amount of this work is being done in the Czar and Holbrook di. visions.
 During 1913 about l04,00O tt. of de. velopment work was done, about TO- 900 ft. of it on contract The timber used for the year was 1S,G45,7l3 ft
 The output for the year was S6IfSl tons of copper ore yielding 9T1Sl725 lbs of copper and l5.573 tons of lead ore. yielding 5.7Ol ,G2S lbs of lead TIC January 1914, the mine has produced total of |. l76.7lS9O5 lbs. of copper