Guayras in Cieza de León’s Crónica (1553)
“The Incas...made clay vessels...which had openings or breathing holes in many places. In these vessels they put charcoal, and ore on top of it; and they placed them on the hills or slopes where the wind was strongest, and extracted silver, which they refined and purified afterwards with...tubes through which they blew. In this way was extracted the great flood of silver that has come from the cerro, the Indians taking the ore to high places all around it to produce silver. These vessels are called guayras, and at night there are so many of them all over the countryside and hillsides that they look like decorative lights (luminarias). And when the wind blows hard, much silver is extracted. When the wind falls, they can extract none.”