Often the grade of ore in a vein in the C19th is quoted in tons or cwts per fathom. I assume that this means the weight of ore per cubic fathom (not a linear fathom). For example if the grade is quoted at 1 ton per fathom, then am I correct in the following calculation:
1 cubic fathom is about 6 cubic metres. 1 ton of galena is about 0.14 cubic metres in volume taking a specific gravity of 7.5. Thus 1 ton per [cubic] fathom lead ore grade = 0.14/6 which is approximately 2.5% lead ore
Martin
Dr. Martin Critchley, ERA-Maptec Ltd., 40 Lower O'Connell Street, Dublin 1, Ireland2*.9
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