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Show SUB-STOPING MINING Y;ETHOD as The cha ract eris tics of the hang ing and foot wall , that the shown by the deve lopm ent work on_390 leve l are such and now bein g adop tion of a mini ng meth od known as sub- stop ing and othe rs, done with exce edin gly low cost s at the Jame s Mine ore body . It is recommended for the Nort h end of the Flin Flon addi tion al is quit e like iy that upon furt her inve stig atio n that terr itor y will be foun d suit able to this meth od. From the pres ent limi ted know ledge of the wall s, the cal plac e Nort h end of the ore body appe ars to be the only logi to lay out this sub- stop ing meth od. of a The foot .wal l as far as sect ion "E" appe ars to be e stop es. firm enough char acte r to allow the open ing up of larg d The high lift of 250 ft. betw een leve ls is sugg este The deve lophere also as sugg este d in the cut and fill method. ly, due to the ment and prep arat ory work on any one leve l is cost ed the corr eshard ness of the rock . Were a shor ter lift cons ider less than pond ing tonn age made avai labl e for stop ins is so much becomes prothe prel imin ary deve lopm ent cost per one ton of ore hibi tive . can The ore clas sific atio ns aske d for by the manage_ment cost of 3½ be made in this meth od by an addi tion al deve lopm ent cent s per ton. the The char acte r of the ore and surr ound ing coun try in is quit e esse niron rang es perm its chea p deve lopm ent cost s whic h rais es and tial in the sub- stop ing meth od where the driv ing of |
