In the Bani region a sandstone occurs from which
grindstones are made. Clay of a fine grade, proper for the manufacture
of bricks and tiles, is abundant. Clays of various colors, found in
the interior of the island, are suitable for the manufacture of
paints. Gypsum is found, especially in Azua province, and the presence
of kaolin and feldspar in the province of Santo Domingo, south of the
central range, offers a possibility of porcelain manufacture.
Petroleum has been found in large quantities in the vicinity of Azua.
The presence of the oil is suspected in other parts of the island and
it is claimed that a petroleum belt which is believed to extend from
Pennsylvania to Venezuela embraces a considerable portion of the
Dominican Republic. Near Puerto Plata, during rains, one of the
streams flowing down from the mountains in the Mameyes section, is
covered with greasy spots thought to be petroleum that has oozed from
the subsoil. Traces of petroleum have also been discovered near Neiba,
and in the provinces of Pacificador and Seibo.
Borings have been made only in the neighborhood of Azua.
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