THE MINERAL RESOURCES OF DEVON AND CORNWALL. 493 
If we attempt to sell this as a copper ore, the quantity of 
copper is so small that the price obtainable will not pay the cost 
of sending to market. 
This will clearly appear, when we consider that in order to get 
three tons of copper to market it will be necessary to send 100 
tons of ore to the smelter, who will have to deduct from the 
value of the three tons the cost of carrying the ninety-seven tons 
of waste, as well as the expenses incurred in separating all this 
waste material ; but if at the mine the proper course of dressing 
operations be adopted, the following results are attainable by the 
treatment of 100 tons of such ore : 
Making a very liberal allowance for cost and waste in the opera- 
tion, we may charge £500 ; and have the handsome sum of £368 
as the amount of profit out of which another liberal allowance 
may be made for payment of cost of extraction and bringing to 
the surface ; but it must not be forgotten that the final nett 
balance is but a small proportion of the value to the locality, 
inasmuch as the other expenses consist principally of labour 
charges, beneficially affecting the population of the district. 
No instance can yet be adduced of this type of working having 
been carried out in its entirety j but at Devon Great Consols it has 
been done to a considerable extent, and proportionate results 
have accrued. 
With abundant supplies of water, cheap fuel and timber, iron 
and building materials ; with good and cheap labour, if well paid 
for; with splendid resources of minerals, good roads and easy 
carriage to and by water, there are opportunities in Devon and 
Cornwall for the profitable investment of capital for the develop- 
ment of their metalliferous resources which have as yet hardly 
been dreamt of. 
Copper, 3 tons of, 60 °/ 0 @ 16s 
20 tons Arsenic=26 4 tons Arsenious Acid @ £10 
30 tons Sulphur=Sulphuric Acid 107 tons @ £3 10s. 
30 tons Iron 
Wolfram, 5 tons @ £12 
£ 
144 
264 
374 
60 
£842 
2 K 
