Bisbee daily review., 1915-11-21

lime content. it is especially desirable
 The Cobre Grande is termed small but has a good body of concentrating ore blocked out At the America no work has been done for several years. Deposits are small but of excellent grade
 Cananea Duluth has ore developed in two parellel veins for over 1900 feet. There is a considerable tonnage of concentrating ore on each level from the first to the sixth. that on the latter level being of higher grade than than any above. except the first. and promising to continue to a much great CT depth
 Many of the company's properties have never yet been explored
 Difficult to Estimate
 MT Elsing further states that ore bodies are SO different and varying. SO irregular and variable in grade. that it becomes an impossibility to figure ore "in sight" or ore blocked out" with any degree of accuracy. Ore reserves therefore become based upon present production of individ- ual ore bodies and stopes The ore bodies that are at present opened up. without the addition of new discover ies will continue Co produce 5O,OOOOOO. pounds of copper annually for four years at least. With the exception of. the Kirk and Henrietta. which have been small producers, the possibility of adding greatly to ore reserves is ex- Cellent Primary chalcopyrite and bornite ore on the eighth. ninth and tenth levels of Capote is most en- couraging as are indications of open ing similar primary ore deposits in Oversight and Sierra de Cobre The primary ore bodies al the bottom workings of Cananea Duluth and Elisa indicate extended life and there are further great possibilities at Puertecito and Elenita.
 Mining Methods Employed
 It win be noted that the larger pro portion of Cananea ores are mined from tunnels and cuts. There is little hoistinc and thus mining costs are low. In these tunnels electric haulage was installed and that system has been introduced wherever it was possible bringing about stlll further economies It has a narrow gauge railway that runs to nearly an points in the camp This winds up trails that would seem all but impossible for the patient bur TO to find foothold. over this road the ores from the mines reach the concentrating beds.
 ene-Cananea is a great property and in a position to accomplish great undertakings. To do this, 10 put it. self in a position to undertake the great production of which it is now capable. much reconstruction and im- provement work had to be done When the present management took charge in 1907, the whole plant, with the ox- ceptiou of the ore bedding and concen- trator plant was found in an unsatis- factory condition for operations upon the scale that were to be undertaken. It did not meet company require ments.
 Economies are Effected.
 Eight new furnaces and one new reverbatory were installed in the shelter and many other improvements were made oil for fuel and electric haulage were further introductions that brought immediate and have since produced large savings in opera ton costs.
 Perhaps the greatest economy re- suited from improved methods in ore handling The ore from the mines reaches the spreading beds over the narrow gauge railroad which runs !; everywhere about the camp. From
 the ore bins a 5000 ton conveyor takes the ore through the samplna ] mill to the spreading beds. There arc
 three Of these, each with a capacity p Of 10000 tons and each 30 feet wide ? by 42O in length Above these beds ? are conveying and distributing belts
 which distribute the ore and huXes in
 proper proportions for smelling and { a "tripper" travelling from end to end ? assures that the charge is always uni g formly mixed After bedding a Ire ] claimer" carries it to other convey - ing belts and it is dumped automat { ically into furnace bins. These, ir Q turn, discharge automatically into tho 3 furnaces, as more charge is from time e 10 time needed Thus from the time
 the ore is shoyeled into the mine cars a underground. until it reaches the fur ]. naces. the handling is all mechanical
 From this brief description of ono . saving method in time and money il % can be seen how thoroughly the com ]. pany proceeded to remodel and tC
 modernize all of its mining and or, , treating methods in bringing abou , an economic systematization of sucl & methods
 Past Production Figures.
 Greene-Cananea can show the fol - lowing production:
 ,- To July list, 1906 247144. .7Ol t Aug. 1906 to Dec. 31, 1907. 5S1So,S5i S Year 1908 ................ 18,619, ,6O' e Year 1909 ............... 44,5476S' q Year 1910 ............... 45,771 ,68I d Year 1911 ................ 44,897 ,46l
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