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.
Jacob's Cavern (q.v.), near Pineville, McDonald county, disclosed on exploration skeletons of men and animals, rude implements, &c. Crystal Cave, near Joplin, Jasper county, has its entire surface lined with calcite crystals and scalenohedron formations, from I ft.
The so-called "Joplin district" of south-western Missouri and south-eastern Kansas-three-fourths of it being in Missouri-produces ninetenths of all the zinc mined in the United States.
The history of the St Francois, Granby and Joplin districts has been sensational.
Of the total output in 1900, three-fourths were made up by the output of St Louis ($233,629,733; of which $193,732,788 was from establishments under the "factory system"), Kansas City ($36,527,392; $23,588,653 being "factory product"), St Joseph ($31,690,736, including the product of some establishments outside the city limits; $11,361,939 being "factory product" within the city limits), and Springfield ($4,126,871; $3,433, 80 0 being "factory product"); for the same four cities in 1905 the proportion of the state's total product ($439,54 8, 957) manufactured under the "factory system" is smaller, and less than three-fourths was made up by the following seven cities: St Louis ($267,307,038), Kansas City ($35,573,049), St Joseph ($ 11, 573,7 2 0), Springfield ($5,293,315), Hannibal($ 4,44 2, 0 99), Jefferson City ($3,926,632), and Joplin ($3,006,203).