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Messrs Mulcaster Farnacres 9th Novemr 1781
Having looked over and recomputed the several articles so as to see how the price of Lead and Silver as they now are will affect the produce of Refining 37Foddr 8Cwt 2 Qrs 14 Lb which is only one pound more than the Tryal was made upon, of Mr Wilkinson of Cos Lead I find that the Loss by Refining supposing 5 Ounces P Fodder of Silver to be produced from each Fodder will be 2s/3 3/4d for the whole Operation, by which youll observe that a small matter more than 5 Ounces P Fodder will still answer but it is clear we never shd Refine any Lead that does not produce by Assay 5 1/2 Ounces or thereabouts, at least so farr as my calculation has gone but I am going forward in making a Table from whence it will be seen at one View how farr this can be carried. In the mean time I send you two calculation papers and shall send the remainder when finished.
The State of the Assays you have as follows. P[er] Fodder
Oz pwt grs
First Assay No 1 Middle Clough Brownley Hill & c slag R 5 11 9
Second Do Do Do R 5 17 14 4/10
First Do No 2 Scaleburn Moss Brownley Hill &c Do X 3 19 15
Second Do Do Do X 3 18 9 6/10
Corn Riggs R 6 4 22 8/10
Those marked R are Refineable the others are clearly not so and must be melted down again I mean No 2. I beg to have a 1/4 of a pound Assays for the time to come.
We are obliged by your attention to the above and also for the proper advice you gave Jno Friend who seemed in away of getting strangely wrong. We wish to have the Ore so circumstanced kept till next years Ore comes in or however smelted by itself & not reported in your Acct til you can do it the first Operation of next yrs Accts. I am
Yours etc
N W Junr
PS Copy the Inclosed on paper & we will send you the Remainder of No 3 & No 2 afterwards.
