These are: the Rio Prieto, the Fajardo, the Espiritu Santo, the Rio
Grande, and, especially, the Mameyes. The river Loiza also contains
gold, but, judging from the traces of diggings still here and there
visible along the beds of the Mavilla, the Sibuco, the Congo, the Rio
Negro, and Carozal, in the north, it would seem that these rivers and
their affluents produced the coveted metal in largest quantities. The
Duey, the Yauco, and the Oromico, or Hormigueros, on the south coast
are supposed to be auriferous also, but do not seem to have been
worked.
The metal was and is still found in seed-shaped grains, sometimes of
the weight of 2 or 3 pesos. Tradition speaks of a nugget found in the
Fajardo river weighing 4 ounces, and of another found in an affluent
of the Congo of 1 pound in weight.
_Silver_.--In 1538 the crown officers in San Juan wrote to the Home
Government: " ... The gold is diminishing. Several veins of lead ore
have been discovered, from which some silver has been extracted. The
search would continue if the concession to work these veins were given
for ten years, with 1.20 or 1.15 royalty." On March 29th of the
following year the same officers reported: " ... Respecting the silver
ores discovered, we have smolten some, but no one here knows how to
do it. Veins of this ore have been discovered in many parts of the
island, but nobody works them.
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