Did you perhaps mean banning?
“~ -- Under this head are classed the method of assaying tin ores, known as vanning, and the amalgamation assay for gold.”
“The process of assaying tin ores adopted in the mines of Cornwall is a mechanical one known as "vanning," the object of which is to find the percentage of "black tin," which, it is well to remember, is not pure cassiterite, much less pure oxide of tin.”
“Buckle up and check out these photo links for a glimpse into the world of Japanese vanning.”
“Me, I just returned with my not fat 81-year-old body from six months camper vanning through Europe, walking a few miles every day.”
“See, the thing is, I was planning to bring my laptop vanning with me this week.”
“If the ore to be operated on does not contain this quantity of metal, then the sample (if coarse) must be reduced to a fine state, the gangue being removed by vanning, and the ore saved for the fire assay.”
“The relation between the actual content in oxide of tin and the produce got by vanning has been tested on several occasions with results which show a fair degree of approximation.”
“Tin, 271 _See also Black tin_ assay for, by vanning, 273 copper in, 204”
“Black tin, 271 an analysis of, 287 assay of, 276 copper in, 204 examination of, 285 separation by vanning, 272”
“The difficulty which beginners find in obtaining satisfactory results, and any loss of metal which those not accustomed to the process may incur, will invariably occur in the vanning of the powdered slag for the fine tin, the rest of the operations being easy of execution, and requiring only the ordinary care necessary for all metallurgical work.”
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