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Updated: May 10, 2025
Without losing a moment we all three entered the subterranean passage, but the tide was still high, and we had to wait for the ebb. This came at length, and, clambering over the rocks, we entered the surf and waded as before. After an hour's toil we reached Punta Hornos, and a little beyond this point I was enabled to hail one of our own pickets, and to pass the lines in safety.
Some of the varieties are quite black when freshly broken, but all weather into a yellowish-ash coloured, soft, earthy substance, precisely as is the case with the compact shaly rocks of the Peuquenes range. This stratum is of the same general nature with many of the beds near Los Hornos in the Illapel section.
They belong to the genera Diprotodon and Nototherium of Professor Owen. The gold of Northern Chili is associated in the mines of Los Hornos with copper pyrites, in veins traversing the cretaceo-oolitic formations, so-called because its fossils have the character partly of the cretaceous and partly of the oolitic fauna of Europe.
We proceeded to Los Hornos, another mining district, where the principal hill was drilled with holes, like a great ants'-nest. The Chilian miners are a peculiar race of men in their habits. Living for weeks together in the most desolate spots, when they descend to the villages on feast-days, there is no excess of extravagance into which they do not run.
The strata surrounding these intrusive hillocks at the mines of Los Hornos, are intersected by many veins of copper-pyrites, associated with much micaceous iron-ore, and by some of gold: in the neighbourhood of these veins the rocks are blackened and much altered. The gypsum near the intrusive masses is always opaque.
This gypseous formation, where first met with, lies in a broad valley or basin, a little southward of the mines of Los Hornos: the lower half alone contains gypsum, not in great masses as in the Cordillera, but in innumerable thin layers, seldom more than an inch or two in thickness. The gypsum is either opaque or transparent, and is associated with carbonate of lime.
This pile of strata dips at an angle of about 20 degrees to N.E. by N., close up to the foot of the Cuesta de Los Hornos, a crooked range of mountains formed of intrusive rocks of the same nature with the above described hillocks.
Outside the fortified wall, which girt the city with its cincture of grey rock, a smooth plain stretched rearward to the foot of the hill on which we stood, and right and left along the crest of the ridge from Punta Hornos to Vergara, ranged a line of dark forms the picket sentries of the American outposts, as they stood knee-deep in the soft, yielding sand-drift.
Near Coquimbo there is much hornblendic rock and various dusky-coloured porphyries. I will describe only one section in this district, namely, from near Illapel in a N.E. line to the mines of Los Hornos, and thence in a north by east direction to Combarbala, at the foot of the main Cordillera.
The latter announced the appointment on his part of Colonels Herrera, Gutierrez de Villa Nueva, and Lieutenant-Colonel Robles. The commissioners met at the Punta de Hornos, and on the 27th agreed upon terms.
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