So far as the available quantity is concerned there is no reason 
why these minerals should not be exported. Prosperity of the in- 
dustry may depend largely on maintaining foreign outlets, in 
which case these should not be closed by restriction requiring local 
conversion and fabrication where this means excessive cost, or by 
import taxes inviting retaliation on minerals of which our own 
supply is deficient. For instance, export of coal from the United 
States is a natural consequence of our large supplies, the needs of 
other countries, and our ability to produce more efficiently and 
cheaply than certain other coalexporting nations. We are in a 
position to do the world an efficient service, We also help ourselves 
by supplying an equalizing and stabilizing facıor to an industry 
handicapped by such seasonal demand that the average coal mine 
is idle over a third of the year. We more fully utilize our capacity 
for production. Without increase of imports there is little room 
for further development of coal export trade without unbalancing 
the ratio between imports and exports. 
(B) The United States has certain minerals o} adequate supply but 
without great excess or deficiency. The supplies of many important 
minerals in the United States approximately balance domestic re- 
quirements without considerable exportable surplus. Small amounts 
of these minerals have been and will continue to be imported 
and exported because of special grades or backhaul, or because of 
cheaper sources of foreign supply. Such imports are not, how- 
ever, for the most part, essential as a source of supply. This list 
includes aluminum and bauxite, arsenic, artificial abrasives and 
emery (except Naxos emery), asphalt and bitumen, barite, bismuth, 
bromine, building stone (except Italian marblie), common stone, 
sand and gravel, cadmium, feldspar, fluorspar, fuller’s earth, gold, 
gypsum, lead, lime, magnesite, mineral paints (except umber, 
sienna, and ocher from France and Spain), molybdenum, oil, 
pyrite, salt (except special classes), talc. titanium, tripoli and 
diatomaceous earth, and zinc. 
For minerals of this group the domestic supplies are such that 
they do not constitute compelling reasons for opening or closing 
channels of international movement. There may or may not be 
(035