Oroblanco
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All right, let's go back to the 1800's then - makes 8-ounce silver slag worth $8/ton. Also makes recovery much more difficult, due to technology of the time? Does the written record make any mention of the slag piles' sizes - even a simple estimate of length, width, depth, etc? As I've stated numerous times, I don't deny the activity - I just haven't seen anything to match its scope to the exaggerated legends.
Ah those pesky "legends" with all the inflated imaginary riches; when the reality you propose is practically negligible, some candlesticks and saddle ornaments perhaps, some copper bells, made from donated jewelry? What makes you conclude that re-smelting old slag is all that difficult? Heck Beth and I have re-melted slag in a camp fire, using some saved charcoal and a little puffer bellows to get a slug of metal. More on the slag in a moment.
Springfield also wrote
Copper mines don't excite treasure magazine readers either. I guess the copper for those mission bells had to come from copper mines - maybe the ones that produced that slag containing 3% copper?
On September 19, 1948, Mr. C. W. Walker visited Tumacacori and showed the author a location about 100 yards southeast of the mission church, on a mound which is presumably part of the unexcavated east wall of the long-abandoned Indian town. Mr. Walker picked up a few small ore and slag specimens from the top of this mound, and showed them to the writer. He then explained that in 1918 he had shipped approximately 120 tons of slag from old slag dumps adjacent to three round adobe furnaces along this stretch of high ground. He says the slag contained about 8 per cent lead, 3 per cent copper, about 8 ounces in silver, and about 1/6 ounce of gold, per ton.
<Source - National Park Service online at: Tumacacori's Yesterdays (The Treasure of Tumacacori)
I would suggest you read the accounts of the old Salero mine ores, Wandering Jew and others "alleged" to be Jesuit in origins, many of these are silver mines which also carry some COPPER. In fact, several of these mines were noted to contain more copper at depth, than was encountered near the surface, which is normal. The logical conclusion to me, is that the ores from these silver mines were processed for both the silver AND the copper, the copper being used for the obvious bells. Silver helped make those impressive silver altar and ornaments seen by witnesses at San Xavier del Bac, which otherwise we have to wonder how these rich ornaments appeared there? Packed in from China, perhaps?
I would also point out, quote
<Ibid>The only known operating mine in the whole of Arizona and New Mexico during Spanish times was the copper mine at Santa Rita, New Mexico, developed after 1800.
Now do you consider 120 tons of slag, circa 1918, to be a "small batch"? Or do we conclude that the author cited, published by the Park Service, was quoting Mr. C. W. Walker whom was being untruthful? Or can it be that the "legends" really ARE based on facts, not fiction made up to sell treasure books?
Also not sure why you seem to think that re-smelting old slag is SUCH a costly, difficult process. I suggest you look into the previously posted similar situation which occurred in Greece, where large, ancient slag piles dating to the Pelopponesian War were re-smelted at a profit.
Mexican Indians have been recorded as smelting metals in a simple bowl, using nothing but a blow-pipe, tossing some crushed ore in with burning charcoal; the metal is reduced to a liquid and immediately poured into a mould. Modern smelting techniques are FAR more advanced of course, but the simple process of charcoal fire with air blown into it, combined with non-refractory type metal ores, will do the trick even if somewhat less efficient than modern methods.
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