374 University Geological Survey of Kansas. 
Cost ofsoperatinestrommelsane err renee 0 .003800000 
COG OVE jilexenbaver, WOWWANEIE, coos oconcoboobouvounevcous 0.01000000 
Costioimicciness cleaner eee ere 0.00980000 
Costiot shaking screentree err tee) eo ere 0.00150000 
Costzof Wialtley stablevsievnrctey ai eer eee eae 0.00890000 
CosHioticentrituea email um pre enee 0.00000128 
Costvot sfueli coali aggre nen Mann eee eee: 0.09800000 
Costrotemaintdriverenoineaenr eer eee 0.00550000 
Cost.of alr Compressors. na eee eee cee 0.00150000 
Costiotalaborrabovereo un G eee eee are 0.06870000 
Total cost per ton of ore treated................ $0 .75708028 
The costs, as given above, are the averages of a large num- 
ber of cases, and should, therefore, be fairly accurate; never- 
theless the sum total, 75.7 cents, or, roughly, 75 cents per 
ton treated, is rather high, yet we believe is not much above 
the-actual cost in many cases. ‘The cost of concentration, as 
given by various authorities, both mill and professional men, 
ranges from 45 cents to 90 cents—the former probably 
being too low and the latter too high for the average prac- 
tice. The cost of all operations both above and below ground, 
namely 75 cents, is then probably not far off. 
The relative cost of hand compared with mechanical jigging, 
for a hand plant of a capacity about one-half that of the 
usual size mill employing mechanical jigs, is $1.15 and 75 
cents, respectively, inclusive of mining and handling the 
products. ji 
HISTORICAL SKETCH AND MINE DIRECTORY. 
Although both lead and zinc have been known to exist in 
the Galena district since 1876, and in paying quantities to 
mine, yet little was done along the line of concentrating the 
ore until several years later. In 1878 a small plant of from 
twenty-five to thirty tons’ capacity per ten hours was erected 
in the Galena-Empire district by the West Joplin Lead and 
Zinc Company and Solon L. Cheney. This plant was later 
owned and operated by Jas. Murphy until it burned down 
a number of years afterwards. 
A thorough canvass of all the mills in the Galena district 
was made in August of 1898, at which time there were found 
to be fifty-six mills, most of which were in operation. A few 
were shut down for repairs and others to have prospecting 
