Answer:
Melchior Diaz concerned about the expedition is explained below in details.
Step-by-step explanation:
Melchor Díaz was the first Spanish pioneer of western North America who "was a tough worker and experienced organizer and general. Melchior Diaz was a pioneer for the viceroy. Diaz obeyed the same track as de Niza and did not locate any towns of gold and, in fact, did not discover any evidence that the Indians practiced metals at all.