The zinc and lead of the Joplin district of Missouri are in the limestone of this system, and the corresponding limestone in some parts of Colorado, as at Leadville, is one of the horizons of rich ore.
Galena is met with at all places where lead is mined; of localities which have yielded finely crystallized specimens the following may be selected for mention: Derbyshire, Alston in Cumberland, Laxey in the Isle of Man (where crystals measuring almost a foot across have been found), Neudorf in the Harz, Rossie in New York and Joplin in Missouri.
JOPLIN, a city of Jasper county, Missouri, U.S.A., on Joplin creek, about 140 m.
In the Joplin mining region a considerable amount of ores is smelted, but the bulk of the ores is sent into Kansas for smelting.
The history of the St Francois, Granby and Joplin districts has been sensational.
The ores of the Joplin district, in the Ozark uplift in the Mississippi Valley, are remarkable in that they are specially adapted to mechanical concentration.
It is in the neighbourhood of a lead and zinc mining region, where surface lead was discovered in 1873 and systematic mining began in 1887; among the cities of the state it is second to Joplin in mineral importance, and has large ironworks and flour-mills; mining machinery also is manufactured.
In 1871 Joplin was laid out and incorporated as a town; in 1872 it and a rival town on the other side of Joplin creek were united under the name Union City; in 1873 Union City was chartered as a ctiy under the name Joplin; and in 1888 Joplin was chartered as a city of the third class.