Spanish documents revealed their existence. Several expeditions have
been sent out, one, I believe, by the Government for the purpose of
locating them; but being situated in the roughest and most inaccessible
part of the Sierra Madre, they are still awaiting their rediscovery,
unless, contrary to my knowledge, they have been found in recent
years. There is no doubt that the country carries very rich silver
ore, and we ourselves found specimens of that kind; but the region
is so difficult of access that it probably would require too great
a capital to work the mines.

There was now a plain track leading along the hillside down toward
the Rio Aros, which is scarcely two miles off; but the country was so
wild and rugged that the greatest care had to be exercised with the
animals to prevent them from coming to grief. The path runs along the
upper part of a steep slope, which from a perpendicular weathered cliff
drops some 400 feet down into a gorge. As the declivity of the slope
is about forty-five degrees, and the track in some places only about
a foot wide, there is no saving it if an animal loses its foothold,
or if its pack slips. All went well, however, until we reached a point
where the track commenced to descend, when our villain of a guide tried
to drive some burros back on the track, instead of leading each one
carefully. The result was that one of the poor beasts tumbled down,
making immense bounds, a hundred feet at a time, and, of course,
was killed.

We had no difficulty in fording the Guaynopa Creek near its junction
with the Aros River, and selected a camping place on a terrace 200 feet
above it. The stream, which is the one that passes the cave-dwellings,
carries a good deal of limpid water, and there are abundant signs
that at times it runs very high. The elevation of the ford, which