UlIAP. XXVI.] PEOSPECTING a DEPOSIT. 
551 
7. A further point that has to be considered is that opencast work can 
be carried out wnth a smaller amount of skilled 
• ^'^f^ ■ ^"^P^^y'^g supervision than underground mining. In fact 
nically-trained managers. ^ .... 
it is often the custom in India — though this is 
most undesirable from the point of view of the life of the deposit, and 
therefore of the good both of the country and of the indi\'idual or com- 
pany to whom the country has entrusted the development of the deposit 
— to open up a deposit, extract the ore in large quantities, and export 
it, without ha\'ing any technically-trained man or men to superintend 
and direct the work. 
Without the technically -trained men noticed under heading 7, it is of 
course impossible for the Ucensee or lessee of a property to ascertain 
anything accurate about the mode of occurrence of his deposit, and about 
its structure, and therefore impossible to work the deposit in the most 
advantageous way. 
The Way to Prospect a Manganese-ore Deposit. 
Let U3 suppose that one has found a loose piece of manganese-ore 
either in a stream-bed or on a hill-side. One goes of course upstream, 
or uphill, as the case may be, to see where the fragment has come from. 
As likely as not the prospector will be rewarded by finding other pieces 
of ore in increasing quantities, and will finally arrive at an outcrop of 
manganese-ore in situ. This outcrop may be an isolated one projecting 
through alluvium or soil, and showing no indications of strike or 
dip, e-g-, 0 in figure 28. The soil should then be removed to a depth 
Fig. 28. — Prospecting an o tcrop oq low ground 'i 
