Joe - I see that others have already posted some of what I had intended to, but would add a bit.
Firstly the slag had enough remaining silver it in to be worth re-processing, which would not be a normal thing to find in iron casting slag.
Second, the only method feasible by primitive tools available to the padres would have been the bloomery type, which does not make all that much slag The wagon loads full would have meant a large iron production going on, which there is no mention of, and on the other hand we have the padres requests for iron tools. If they were able to produce their own iron, and then process it into tools, there would have been no need for importing iron tools.
Third; We have covered the slag heaps found at Tumacacori and Guevavi, but no one has mentioned that
slag is actually built right into the San Xavier del Bac mission! It is black and looks very like silver slag, which one can only conclude the Franciscans who built the current church at San Xavier simply used the piles of slag left by the previous occupants, whom would have been the Jesuits. It is hard to say the slag dates to after the padres when it is built right into the very church itself! (the slag is crushed into small piece, mixed right in the mortar, it gives the pretty contrast with the red) In case anyone thinks I am making this up, here is a direct quote:
The outside walls of the church were finished with a double coat of lime plaster. The lime was obtained by burning stone which can be found in the vicinity of the mission. Above the offset line, or on approximately the upper half of the walls, the plaster was floated smooth and left with out decoration, but on the lower half of the walls a peculiar form of decoration was used. Fragments of brick and black slag were crushed until the pieces were about the size of grains of corn. Before the plastered surface of the wall had hardened, the workmen went over it, slapping half a handful of these red and black pebbles into the soft plaster at intervals of about a foot in regular lines which ran vertically, diagonally, and in a horizontal direction. The black and red mixture makes an interesting decoration in the white lime plaster.
Source: Tumacacori National Monument By Frank Pinkley, Superintendent Southwestern National Monuments, US Park Service, pp2 2007, available online at:
Mission of San Jose de Tumacacori
So if this slag built right into the San Xavier church is not from silver smelting close by, one would be forced to wonder where in heck it came from? Did they haul it up from Sonora? Was it obtained from unknown and un-recorded Spanish miners whom were smelting close by, and somehow escaped notice in any record? OR is the obvious answer the right one? That being that the Franciscans used smelter slag from the silver smelting
done by their predecessors the Jesuits, both for beauty and to make use of it and so dispose of it at the same time.
Here is another reference, from a reputable source and not a treasure writer, attesting to the mining and smelting at the missions at an early date:
The first civilized men to visit the Arizona region were the Spanish Jesuit missionaries who from Sonora in 1687 explored the valley of Santa Cruz River and considerable portions of the Gila and San Pedro valleys. Their reports of the fertile valleys and mineral wealth of this new country led to the establishment on the Santa Cruz of the missions of San Xavier del Bac Tumacacori Santiago, and San Cayetano, the town of Tubac, and farther north that of Tucson. The first mission in Arizona was established at Guevavi or Guebabi about 30 miles south of Tucson in 1687 and those of San Xavier and Tumacacori soon followed.
These missions have an important bearing on the mining history of the region in that their founders and keepers the Jesuit fathers were in a sense the pioneer miners of the country and conducted mining operations with a considerable force of men mostly impressed Indians in connection with their missionary work. That they must have operated on a considerable scale is indicated by the extent of the workings and the slag dumps still seen near the mission ruins. They named the old Salero and other mines in the Santa Rita region. The San Xavier mission 9 miles south of Tucson founded prior to 1694 and still standing, an object of visit to tourists is described as a large church with imposing architecture in which $40,000 in solid silver taken from the mines in the Santa Rita Mountains near by was used to adorn the altar.
US Geological Survey Bulletin 582, Mineral Deposits of the Santa Rita and Patagonia Mountains Arizona, Frank C. Schrader, James M. Hill, 1915, US Govt Printing Office, pp 21-22
Actually this long debate has led me to wonder
why, our modern historians seem to be trying to erase and revise this portion of Arizona history? What is being gained or protected?
Please do continue amigos, oh and one other thing I found that smelting slag was also found at Tubac, but clearly from smelting copper, as there were copper minerals found with the slag, near the ruins known as "Casa del Osos" indicating that copper smelting was being done there in the colonial period; that this is most likely NOT done by the padres seems certain, however it may well be supporting evidence to the Molina documents which refer to metal mining near Tubac.
I hope all is well with you and Carolyn, Joe, we have been pretty busy here of late trying to get the garden ready after problems with the old tiller set us back in tilling dates. May drop you a "newsy" type email later, not on this topic however some interesting tidbits on the Custer project you might find interesting.
Roy