PREFACE. 
A DESCRIPTION of the methods of mining and milling in 
any region, to be complete, should incorporate the prac- 
tice of the whole region of which that particular district is a 
part, and for that reason the writer feels somewhat handi- 
capped in confining his discussion of methods of mining and 
milling of lead-zinc ores to the Galena portion of the Joplin 
area. Furthermore, the Joplin portion of the region has prob- 
ably led in the introduction of new ideas and methods, both in 
mining and milling; consequently statements regarding 
methods and processes may be somewhat at variance with the 
practice familiar to those in other parts of the Joplin region, 
as well as in other parts of the country. There is, however, 
very little difference in the methods, taken as a whole, while 
in a few instances the practice along certain lines has far ex- 
celled that in other parts of the region. 
Brief statements and descriptions are made explanatory of 
the methods of prospecting, development, and mining; also 
regarding the practice in milling of ores. The machines, 
typical of certain operations or processes, are described, and 
their construction illustrated by pen sketches and photo- 
graphs. 7 
It has neither been the purpose nor intention of the writer 
to prepare, in this connection, a detailed treatise on the the- 
ory or practice of the district; rather, he has attempted to 
elucidate, by the simplest means possible, the typical and 
fundamental methods shorn of many confusing modifica- 
tions; similarly with the apparatus employed, types have 
been chosen, and explained more largely by graphical than 
by literal means. 
Little theory has been incorporated in the work—the idea 
being to prepare a report which could be readily understood 
by the layman; 7. e., by those not especially acquainted with 
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