The correct answer to this open question is the following.
Spanish Viceroy Mendoza had ordered Fray Marcos de Niza to journey to Mexico and other regions. He reached the region of the Zuni Pueblos in New Mexico, and he wrote in his report that in this region of teh Americas there were many raw materials and natural resources that could be exploited to increase the wealth of the Spanish crown. He cited that he had heard of a place called the Cibolas that had great richness. It supposed it was the Zuni Pueblos place but he could not enter the city.
That Niza's report played a major role in the Coronado expedition. Viceroy Antonio de Mendoza ordered the Coronado expedition that was led by Francisco Vázquez Coronado, but the guide of the expedition was Marcos because he knew the way to the Cibola.
However, when the expedition reached that place, they did not find any raw materials, gold, or silver.