Show TECHNICAL PROGRESS 11 IN IN MINING it Is an interesting fact tl that lat the american mining industry during years in w which aich prices have stayed nt fit the bottom and supply has haa constantly outrun demand has not stood still it has bils mado made reat technical progress I 1 this Is especially true of the copper in entries tries by cutting cuttin g costa coata and improving methods all along tho the line copper oro of a grade that WAS considered worthless a few years yeara ago la Is boang mined nt itt a profit lodes containing as little as aa of ono one per co cont nt of tho rod red intal are ara boing worked mining Is an example of an industry tha tant t in good thu almea ca or bad continues to go forward |