The
nickeliferous deposits, situated within
the Surigao Mineral Reservation along
northeastem Mindanao, are residual
products formed by tropical chemical
weathering of ultramafic rocks and their
clastic derivatives.
A survey ol the broad field of
geochemistry was undertaken and brought
to light the influence of several
factors on the geochemical character of
the metal ions in migrating solutions
under surface conditions. The importance
of ionic potential, pH, and redox
potential are discussed in this paper
with the aid of charts, tables, and
stability diagrams.
The applicability of a portable DTA
apparatus on the mineralogical study of
laterite is investigated. Tentative
interpretations are drawn from the
results.