IRON ORES - 1914 - PREFACE - The material presented in this volume
has been worked over, at intervals, during many years of
professional activity and certain sections have, as later noted,
been published in various technical journals and in private and
official reports. The volume as it now stands represents an attempt
to discuss iron ores not merely in their geologic and technical
relations, but in their more general relations to industrial
conditions. The field thus outlined is broad, and the risk of
failure is correspondingly great. But on the other hand there havc
bcen exceptional opportunities for studying thc iron-ore situation
from several widely different standpoints, and something more than
a purely technical treatment seemed to be both justified and
desirable. The industries based upon iron ores arc of interest,
directly or indirectly, to the entire business and financial world
and have also to some degree become matters of political concern.
Any adequate discussion of the general iron-ore situation must
therefore take into consideration many factors not commonly
regarded by the geologist or the engineer, and too often passed by
as not susceptible of exact definition or scientific treatment. It
is hoped that this volume will prove to be, if not conclusive, at
least suggestive in these regards. Beginning with some
consideration of the natural abundance and wide distribution of
iron, the manner in which this disseminated iron is concclltrated
into workable ore deposits is discussed in considerable detail. It
may be noted, in this connection, that the sedimentary ores are
given space more nearly commensurate with their overwhelming
importance than has been common practice. Thesecond section of the
volun eis devoted to discussion of the various factors affecting
the value of iron ores and the valuation of ore deposits. An
introductory chapter surnmariees the basal factors concerned in
these matters. This is followed by a discussion of prospecting or
exploratory work, in which for the first time an attempt is made to
indicate the manner in which theories of origin actually bear upon
the examination of ore deposits. Following this are chapters on
mining costs, concentrating possibilities, and furnace and mill
requirements, so far as any of these matters bear upon the subject
of ore valuation. Later chapters of this section treat of prices,
markets and other financial aspects of the problem. Descriptions of
the more important ore deposits of the world are contained in the
third part of the hook. In preparing these descriptions, an attempt
has been made to consider the deposits in the light of their
present and possible industrial importance. Deposits of local
importance and those which are of interest solely as geologic
occurrences are not described, and individual mines and ore
properties are not noted except as illustrating general types. The
attempt has been to give, with regard to each important ore field,
sufficient data concerning its location, type, ore grade, shipments
and reserves to justify conclusions expressed by the writer, or to
enable the reader to form his own conclusions, as to the present
and possible future importance of that field. In most cases very
full reference lists are included, so that further details can be
looked up as desired...
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