THE NORTHWARD EXPANSION 385
diamonds:
one a metal with an unlimited market, the other at that time still
primarily regarded as a luxury product, confined, so far as the major
sources of production are concerned, to Africa south of the Sahara and
with a highly centralized marketing organization.
He
was now to concern himself also with some major base metals— copper,
lead and zinc—widely distributed internationally, subject, especially
as regards copper, to very wide swings of demand and therefore of
prices, and all of them (again especially copper) having come under the
control of powerful groups, at that time largely American, backed by
great financial resources and dominated by forceful individuals. And
since the area in which these metals were to be exploited was still, in
the twenties of this century, primitive in the extreme, he was called
upon, in the course of development, not only to deal with problems of
geology and of mining and metallurgical technique, with organizational
and financial requirements of a very serious kind, but he also
encountered the problem of labour—both white and black—in a setting
which resembled the South Africa of an earlier age rather than of the
then present.