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A Calculation of the Yearly Value of the Lead Mines comprized in Sir Walter Blackett’s Lease for Lives according to Mr Richmond’s Conception 20th August 1762 (in his Observations upon Mr Halhead’s Calculation of the Yearly Value of the Lead mines granted to him by the Lease for Years) and according to the Terms of the only two Tacks lett, Viz. Scraithhead and Pike Stone. Bings h The Whole Quantity of Ore got under 49987 0 1/2 said Lease for Lives in 14 Years 1746 and 1759, both inclusive, being The Quantity in one Year will be about 3570 2 Deductions The Bishop’s 1/9 Lott nearly 396 3 3173 3 at 50s £7934 7 6 Scraith head Pike Stone The Rector’s 1/10 after the Bishop’s 1/9 is taken out 317 1 1/2 a 50s 793 8 9 at 33s 5891 6 6 Raising 3570B 2h a 30 5355 15 Money Rent Reserved by the Lease 150 150 Total of Deductions besides the Bishop’s Lott £6299 3 9 £6041 6 6 One Year’s Value (exclusive of the Profits by the Composition for the Bishop’s Lott and the Rector’s Tenth) 1635 3 9 1893 1 - One Year’s Profit by the Bishop’s Lott Only 670 10 670 10 - 2305 13 9 2563 11 - N.B. N. Halhead is of Opinion that the Quantity of Ore raised Yearly under said Lease for Lives from the Year 1750 (when the Lease in Being was granted) to the present time considerably exceeds 3570B[ings] 2H[orse] and that the Medium Price for that time also considerably exceeds £12 10 p Ton for Lead, which Answers to 50s p Bing for Ore .
Undated and unsigned but assumed to be calculations for the Bishop in respect of negotiations over combining the leadmining leases in Weardale. Dated here to 1 April 1763, ie. to similar calculations dated 24th April, assumed (from handwriting) to be from Thomas Marshall to Nicholas Halhead.