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Cupels from a Utah Mine Assay Lab (88658)

Currency:USD Category:Collectibles / Mining Start Price:60.00 USD Estimated At:120.00 - 250.00 USD
Cupels from a Utah Mine Assay Lab  (88658)
SOLD
65.00USDto s*********1+ buyer's premium (16.25)
This item SOLD at 2019 Jan 26 @ 10:24UTC-8 : PST/AKDT
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Add to your historic mining collection with this variety of assay cupels and other mining assay lab items. This lot has more than 30 cupels in multiple sizes and shapes that have been used in determining the precious metal content of ore materials at a Utah mine. There are even two paper envelopes containing finely ground ore read to be tested. Cupellation is a metallurgical process thousands of years old that heats metal ores to very high temperatures with litharge (a fine powder containing metallic lead) in a porous container. Noble metals, such as silver and gold, do not oxidize at high temperatures, but other metals and impurities, such as lead and iron, oxidize and are absorbed and trapped into the porous cupel, leaving the precious metals in a more refined state at the bottom of the cupel. For millennia, cupels have been made with bone ash, and their conical shape has remained essentially unchanged to this day. The used cupels in this lot vary from about four to five inches in height. There are also about a dozen small-sample cupels approximately 1 to 1.5 inches in diameter. State: Utah City: Date: