NOTES ON THE VALUATION OF COPPER ORES.
Closely bound up with the practice of dry copper assaying is that of
valuing a parcel of copper ore. The methods by which the valuation is
made have been described by Mr. Westmoreland,[51] and are briefly as
follows:--The produce of the parcel is settled by two assayers, one
acting for the buyer, the other for the seller; with the help, in case
of non-agreement, of a third, or referee, whose decision is final. The
dry assayers who do this are in most cases helped, and sometimes,
perhaps, controlled, by wet assays made for one or both of the parties
in the transaction.
In the case of "ticketing," the parcels are purchased by the smelters by
tender, and the value of any particular parcel is calculated from the
average price paid, as follows:--The "standard," or absolute value of
each ton of fine copper in the ore, is the price the smelters have paid
for it, plus the returning charges or cost of smelting the quantity of
ore in which it is contained. The value of any particular parcel of ore
is that of the quantity of fine copper it contains, calculated on this
standard, minus the returning charges. The ton consists of 21 cwts.,
and it is assumed that the "settled" produce is the actual yield of the
ore.
If at a ticketing in Cornwall 985 tons of ore containing 63.
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