Miners and vecinos state that new discoveries in Sierra de Tamaulipa in last 4 years provide legal standard of quality (6 ounces of silver for each load of metal), and proportions given for other qualities which exceed legal standard. Costs of firewood, transportation and other costs make it difficult to make profit. Need for greater population; enemy Indians have returned with depopulation in center of Sierra de tamuaulipa and Apostate Indians raiding surrounding area. Complaints of Nava's offering low price for silver and using Alcavala money to buy silver (attractive to miners as it saves transportation cost and robbery risk. In Guadalcazar, nephew of Nava levied 10 real Alcavala. Nava's influence with governor allows him to exploit situation. Charges that document supposedly from miners and vecinos is really false, need to interview witnesses. Description of founding of San Carlos in 1666 and formation real de San Joseph. Description of San Carlos church and other structures. Advantages of having established beneficio de metales at San Carlos. Suggestion of miners working metals in their own home in areas nearer to mines. explains how to contruct a galeme. Control of silver and transport to San Luis Potosi treasury. Noriega charges list of witnesses is incomplete, and agrees to provide documents to Bucareli. Testimonies on metal profits, Nava's conduct, discussion of abundances of metal, wood, water, ovens, transport costs, and amount of metal resulting after processing. List of owners on mines, number of workers on each, and ounces extracted per load (Leyes) of metal, and economic class of miners. List of depopulated mines. Also list of owners of patentes, galemes, and metal processing equipment (basso, dissetisor) according to location. Ocotillo and Barreta listed as most abundant wood for processing metals. Discusses price of production relative to output of metal. (L. L. Woodward, October 1988)