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Messrs Mulcaster Farnacres 16 Novemr 1781
We have reced yours of the 14th & 15th instant this Afternoon and you have as follows the produces from Assay
Brigalburn 7: 6:19 3/10 P Fodder
Middle Cleugh 10.15.14 4/10 P Do
Operation 9. 3.18. P Do
After Refined 9.19 2/10 P Do
The produce of Silver this Operation will be as follows
Weight of Silver according to your Weighing. 714: 5
Do. According to Assay shd have been 744. 3.18
Short of Assay 29.18.18
Left in the Lead & Rich Litharge at least 39.18.18
Over 10
We are sorry to see the produce so bad, it is just 1/8th & a Quarter part not deducting the Litharge saved.
There was no difficulty in weighing the Small Assays. It is clear you are right in what you suggest as to judging of the Slag Leads produce in Silver under the circumstances you mention.
The loss by melting down 84Cwt 2Qrs 2Lbs is in value by computation 10s/4 1/2d besides the labour & being about a One hundred and fourth Part.
It gives us satisfaction to hear your Ore Accounts turn out right on comparing. We are
Your Humble Servants
Walton & Turner
