California mines and minerals . CuiirLiiTEu Hoisting Works at Tiiii ONiiijjA Mi^-k. factors in making a great and lasting mine, and is more apt to befound in the better confined than in the widespread section — but theconditions which favor the strongest mineralization are little under-stood and doubtless complicated. A Field for Deep Mining. — The rich spots on the surface ofthe lode, the poor mans diggings, have long since been exhausted,but, unfortunately, many of the claims awaiting proper test are stillheld by men unable to open them and unreasonable in their expecta-tions. Such men retar
California mines and minerals . CuiirLiiTEu Hoisting Works at Tiiii ONiiijjA Mi^-k. factors in making a great and lasting mine, and is more apt to befound in the better confined than in the widespread section — but theconditions which favor the strongest mineralization are little under-stood and doubtless complicated. A Field for Deep Mining. — The rich spots on the surface ofthe lode, the poor mans diggings, have long since been exhausted,but, unfortunately, many of the claims awaiting proper test are stillheld by men unable to open them and unreasonable in their expecta-tions. Such men retard development. There remain to be tested a number of sections which were goodon the surface but became poor at moderate depths, and many morewhich show only low grade ore on the 72 CALIFORNIA MINES AND MINERALS. On the whole, there is an excellent field for deep mining in thebetter mineralized sections of this Mother Lode, but it is one thatshould be entered only with large capital and a rational mining spirit. Literature.— The geological features of the lode are best pre-sented by Mr. Fairbanks in the State Mineralogists Tenth AnnualReport, 1890, accompanied by a map showing approximately the dis-tribution of the various enclosing rocks, and the line of most impor-tant claims; also by Messrs. Lindgren and Turner in the publishedatlas sheets of the United States Geological Survey. The latter areconsidered the most authoritative regarding the surface formation,but the scale is too small to illustrate the location of individual mines. There is a certain amount of information to be had concerningthe mines of the lode in the United States Reports on Mineral Re-sources, in the various reports of the State Mineralogist, and in thefiles of the Mining and Scientifi
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