Fuentes' letter to Palacio includes quote from Palacio with stated goal of fully exploiting mines of San Carlos Tamualipa suspension of Alcavala, Media anata; land made available to miners; extension of cattle grazing; wood, materials and equipment tax free; sale of gun powder at Mexico City price; quicksilver to be sold at San Luis price; as well as other ways of promoting metal production. Palacios to Croix expresses desire of miners for priest sundays and for festival days; tax on silver to construct church; need to develop water system. Discussion of favorable metal production in San Nicolas. List of group of miners some who are witnesses and elected members included with Nava and Fuentes in report promoting mining. Fuentes in letter to Palacios explains that some mines are not being worked due to absence of their discoverers, uneconomical conditions for exploitation, and lack of tools; abundance of veins and continual discovery. Lists made by Fuentes of San veins; quantity per load of ore extracted at each mine. Partial copy of duty charges of Alcabala from may - June 1768, includes who sold what to whom (especially food) (ff 316). Letter from Nava to Palacio discusses state of individual processing abilities; production capacity. Letter also tells duty Charged on silver and gold. (L. L. Woodward, October 1988)