Tmelted and purified* a rich Copper, io{. 
per Ton more valuable than what is ob¬ 
tained from the Ore of the fame Mine.——— 
This was difcovered, by obferving, that fome 
Iron Tools of the Workmen, which had 
fallen accidentally into the Water, were after 
a while incrufted with Copper. 
A Chain of thefe Pits is already made, 
each io Feet in Length, 4 in Width, and 8 
in Depth: and as many more may be funk 
as People pleafe, there being a continual 
Supply of Water to run through them all. 
They make ufe of foft Iron, which attracts 
the Copper Particles belt, diffolves, mixes, 
and participates with them in form of a 
brown Duff. A Ton of Iron in Bars pro¬ 
duces one Ton, nineteen Hundred, and two 
Quarters of brown Dull:; and each Ton of 
Duft fmelted, affords 16 Hundred Weight 
of pure Copper. There are at prefent about 
500 Tons of Iron in the Pits. A large Bar 
of foft Iron will be diflolved in about 12 
Months 
iV. B . Whilft the minute and invifible 
Particles of Copper are floating at Liberty 
* The above Account is the Subftance of a Letter to Sir 
Hans Sloane, which he favoured me with the Ufe of; and al- 
fo of another Letter communicated to the Royal Society by 
juord Cadogan : both thefe Letters were written by the Re¬ 
verend Mr. William Henry, who was himfelf upon the Spot. 
I have alfo a Lump of Metal, wherein moll of the Iron has 
been diflolved in the Water, and its Place fuppUed by Parti¬ 
cles of Copper. 
Vql. II. 
G 
m 
