Transactions . thickness, ::<.n Till] MISSOURI AND ARKANSAS ZINC-MINES. easily mined, and soon exhausted; and as they constitutedmainly a large cavern-deposit, while the place is encircled bythe coal-measures (see Fig. 1), the prosped for valuable exten-sions is not favorable. Joplin.—The mines of this district arc more scattered. Manyof the ore-deposits are of comparatively recent discovery, andwill continue for some time to be productive. Moreover, evenin the exhausted and abandoned mines there is a chance of dis-covering, by further exploration, extensions of the ore-deposits. Webb City
Transactions . thickness, ::<.n Till] MISSOURI AND ARKANSAS ZINC-MINES. easily mined, and soon exhausted; and as they constitutedmainly a large cavern-deposit, while the place is encircled bythe coal-measures (see Fig. 1), the prosped for valuable exten-sions is not favorable. Joplin.—The mines of this district arc more scattered. Manyof the ore-deposits are of comparatively recent discovery, andwill continue for some time to be productive. Moreover, evenin the exhausted and abandoned mines there is a chance of dis-covering, by further exploration, extensions of the ore-deposits. Webb City and, Carterville.—These camps contained the largestdeposits of zinc-ore in the region. Mining has been continuoussince 1876 on ore-bodies 100 ft. in vertical thickness, and often1000 ft. wide, upon a belt 4 miles long. This ore-formation,discovered in open boulder-ground, was cheaply mined, andwas nearly exhausted five years ago, but operations on a smallscale have been revived and. continued since. Fig. 4. North and South Section through Joplin, into Arkansas. Present mining is conducted extensively upon a sheet ofzinc-blende, with streaks of galena, resting on the rock-bed(see Fig. 3). This deposit is very hard, requiring the use ofmuch dynamite in mining; and the cost of mining is $20 perton of clean concentrates (the material in place averaging 6per cent, of zinc and 1 per cent, of lead). Consequently itcannot be mined, with profit (above cost and royalty) unlesszinc is worth $35 to $40 per ton—or, in other words, concen-trates are salable at $30 per ton. The region is favorably situated for the discovery of new andvaluable extensions of the ore-deposits; but the present pros-perity must depend upon the market-price of zinc-ore. Neck City, Alba and Carthage.—These camps are new, and havethus far been proved to contain large deposits, approaching inthickness those of the Webb City and Carterville camps, asfirst developed. Since the ground is only of medium softness,
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
