Columbus names a river Río del Oro for gold grains found there

So on the next day, Thursday, the 14th of March, having crossed the Yaquí with canoes and rafts, people and baggage, and the horses at a deep ford, though not swimming, unless the river came down in flood, a league and a half from there they came to another great river which he called the Rio del Oro, because, it is said, they found certain grains of gold in it at the crossing. This river appears to be either the one the Indians called Nicayagua, which is about a league and a half from the Yaquí, the great one behind them, and flows into it, but it is not large, save that at that time it must perhaps have been in flood. Three other streams join this river Nicayagua, itself a small brook: one the Buenicún, which the Christians, in the course of time, called the Rio Seco, the Dry River, another the Coateniquím, the third the Cibú, with the last syllables stressed. These were very rich, with the finest gold, and they were the principal wealth of Cibao. …