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Part of Mr Walton Jnrs Letter of 28th September 1770 to Mr Smeaton Copy of Walton & Smeatons Letter of 28th September 1770 to Mr Ibbetson Extract from Mr Mulcasters Letter of 24 September 1770 to NWalton Junr relative to Assays made from Litharge Lead. The above were sent Mr Smeaton along wth sd Letter to him. I have wrote to Mr Mulcaster and told him I think the several Tests from whence the pieces are taken which are afterwards put into the Refining Test should not be drawn too lon before those pieces are taken lest some of the Silver should come off with the Litharge and have desired he will keep some parcells of the last Litharge which comes off those Tests and make Assays of them. The Produce of the Assays referred to in Mr Mulcaster Letter of 24th September is as follows Oz Dwt Gns No. 1 per fodder 7 16 19 2/10 No. 2 per Do 28 18 4 8/10 No. 3 per do 345 16 8 4/10 I am glad to inform you Mr Sparke has actualy discovered a promising Vein of Lead Ore in carrying up a Level for Dryburn Copper Vein and has sold an Eighth of it for £200. The Lead produced from Mr Sparke's Ore gives according to his Account better than 20 Ounces PFodder.