Transactions . the ore. While the opposite pitch may be weak, as at the Black Jack, it issometimes lacking entirely and the entire mining may be done on onepitch, with as much of the core ground as may be carried profitably. 222 THE WISCONSIN ZINC DISTRICT In such a case there is no definite hmit to the orebody in the core ground;the hmit will be a function of the cost sheet. The best illustration wehave of such a condition is at the Coker mines of the Mineral PointZinc Co., shown in Fig. 3. A reference to the map will show the extra-ordinary length and persistence of the orebodies, showing to
Transactions . the ore. While the opposite pitch may be weak, as at the Black Jack, it issometimes lacking entirely and the entire mining may be done on onepitch, with as much of the core ground as may be carried profitably. 222 THE WISCONSIN ZINC DISTRICT In such a case there is no definite hmit to the orebody in the core ground;the hmit will be a function of the cost sheet. The best illustration wehave of such a condition is at the Coker mines of the Mineral PointZinc Co., shown in Fig. 3. A reference to the map will show the extra-ordinary length and persistence of the orebodies, showing today, withNo. 1 mine, a mined and drilled out orebody of some 6900 ft. (2103 m,).No. 2 orebody, if the mines of the Vinegar Hill Zinc Co. are included, willshow a continuous length of some 7500 ft. (2286 m.). The dip of thepitch at No. 1 mine is to the north; at No. 2, to the south. In theory,there should be a south leg for No. 1, and a north leg for No. 2, but drill-ing and prospecting has failed to show Fig. 3.—Cokerville mines, Livingston, Wis. This is one of the oldest and most productive orebodies in the dis-trict. A noticeable feature is the wavy line that the range takes,maintaining, however, a generally westerly direction. These swings ofthe pitch are frequently quite sharp, and on the Coker 2 map, it will benoted that in the space of only 100 ft. (30 m.) the pitch swung around indirection 90°. Sections of the orebody are shown across lines AB, CD,EF. The number of flats, height of pitch, and floor elevation vary with-in considerable limits, but its generally uniform width is mines show very well, as in section AB, the several steps of the pitchand flat, a phenomenon rarely seen in the mines farther south, wheresteep pitches, with no break until the top of the orebody is reached, arethe rule. The Coker mines furnish the best illustration of the flatrunning off at right angles to the strike of the pitch, sometimes for 50 ft. \V. F. BOERICKE AND T.
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
