It would seem rational, as regards this, to try to put to profit the
hydraulic power that the flumes and canals render disposable for
mechanically extracting the sand. The field to be worked being naturally
long and narrow, it would be the proper thing to employ a series of
inclined planes distributed along the banks, actuated by water wheels, and
corresponding to so many small working points. The river often flows
through a genuine canon with nearly vertical walls, where space would be
absolutely wanting for installing wheels elsewhere than at the exit of the
canal, and if may become necessary to distribute the power of these wheels
along the works. In these regions of difficult access and few resources it
is necessary to dispense with complicated apparatus, and one might in such
a case, it would seem, try electric motors, whose installation would be
easy. An exploitation in accordance with these ideas was begun for the
first time in 1883 upon the Ribeirao de Inferno at Portao de Ferro. We
shall describe it.
Once established in the country, the first thing to do is to form roads so
as to secure communications with the neighboring villages and forests, and
afterward to cut down trees for building houses.
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