CRANE. | Addenda. . 365 
cessity, therefore, be given in a more or less disconnected 
way, but follow the same order as given in the report. 
Prospecting and Development. 
The methods of prospecting employed at present differ but 
little from those in previous use, while little more can be said 
regarding development in the same kind of ground as was 
formerly worked. New districts with a different occurrence 
of ore, however, have been discovered, and are now being 
extensively worked. ‘The bedded or sheet ground is that re- 
ferred to, and has added to the Joplin region several remark- 
ably rich and extensive districts. The sheet deposits are 
more uniform, and consequently much easier to work, than 
were the extremely irregular massive deposits which pro- 
duced the great bulk of ore a few years back. 
The development as well as prospecting of the sheet 
ground is not only much easier but more reliable, and is 
able, in this particular case, to be differentiated from mining 
proper, which was not always the case previously. 
Development work is carried on in the sheet ground by 
drifts run systematically in the deposit, which usually con- 
form with the pitch of the ground, provided it is not pitched 
at too high an angle. These lines of drifts are driven ahead 
of the workings, and so prove the character and extent of the 
deposit, thus determining when and where the mining opera- 
tions proper, 2. e., extraction, shall begin and how extend. 
Mining. 
The only radical change in the system of mining was 
brought about by the opening up of the sheet ground, when 
both under- and overhand stoping were largely done away with 
and breast stoping almost wholly employed. 
By the successive operations of development and mining 
or extraction about the foot of the shaft, the deposit is de- 
veloped into a long-wall face, from which to the shaft extend 
lines of track for hauling away the loosened ore and wastes. 
The method does not differ essentially from the method of 
mining coal by long wall, except that the ore is not loosened 
by undercutting and wedging or blasting down, but by ver- 
tical cuttings in the face, extending from top to bottom. The 
