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Dukesf[iel]d: 28th Nov'r 1787 Sir The quantity of Test Bottoms at this Mill could not be wought up here (with the present convinience) in less time then half an year w[hi]ch would increase the Gray Slags much as they must be wrought at the Slag H[ear]th. I have below made a calculation what Qant[ity] it will take of them according to the Tryal before made w[i]th the exp[en]ces charging the Test Bottoms at 4£ per Ton that you may judge f'm the price of Lead & the likelyness of it's continunce whether it would be most advisable for to abate of the 4£ or not; f'm the present state of the Mines there's little fear of this Mill wanting Ore & to get both the Gray Slags & Test Bottoms to markett next year cannot be don w[i]thout converting one of the Ore H[ear]th into a Slag H[ear]th £ s d To Test Bottoms to make 1 Foth[er] of Lead 4 Ton @ 4£ per ton 16 - - To Exp[en]ces of Working the above & Fuel 2 9 4 To Carriage f'm Dukesfield to Blaydon of the above Lead 11 1 19 - 5 NB The Last Assay that I made of the Test Bottoms Lead yielded 11 oz of Silver to the Foth[er] IH
Recipient un-named but would appear to have been JEB, as the content follows on the previous letter in this series.