...explorations below that limit have not proved very satisfactory. Drawing the lines a little closer, it may lie said that in proportion to the amount of exploration...occupies the space from the surface down to about 1.000 feet below it, and its lower limit thus forms a curved surface approximately parallel to the...

...than the interval from that limit to the lowest levels reached — about 1,500 feet. It must not l>e overlooked, however, that four or five mines still have good ore bodies at a depth of 1,'JOO to 1,400 feet from the surface. The developments of the next year or two will probably 'give...

...pitching sharply northward, the ratio of vertical to horizontal extension varying from 1£ : 1 to 5:1. Some of these shoots are however, of about equal dimensions...depth of 1,200 to 1,400 feet from the surface. The de14 velopment of the next year or two will probably give a safer basis for generalization. "Roughly...