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Wheal Brothers (Wheal Duchy), East Cornwall Silver Mines (St Vincent Great Consols; incl. Wheal Emily; Wheal Georgiana; Wheal Mercer), Wheal Langford (New Wheal Langford; Baring and Langford Mine), Calstock, Callington District, Cornwall, England, UK

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Latitude & Longitude (WGS84): 50° 30' 25'' North , 4° 16' 9'' West
Latitude & Longitude (decimal): 50.5069444444, -4.26916666667
UK National Grid Reference:SX391700
Refs: Hamilton Jenkin XV 1969. Dines 1956.

Wheal Sisters was developed on the same lode to the east.
The mine was first opened about 1810 under the name of Wheal Duchy. When prospecting for copper ore, silver ore was found probable associated with a north-south crosscourse. The lode is recorded as being upto 31cms wide, and the silver ore upto 15cms wide. The silver lode was found in the adit level, from there it extended to a depth of 55 mts, and for a lenth in the lode of 5.5mts. The silver deposite consisted of native silver, pyrargyrite, acanthite, galena, siderite. (recordes also record grey and black sulphides of silver and antimony, without stating what they where).
Wheal Duchy was closed in 1816, but was reopend in 1833, and called Wheal Brothers. When the 30 fathom level was investigated a quantity of silver ore was found standing in the stopes. The previous owners had apparently not recognised it as silver ore. And within three months nearly 6000 uk pounds worth of silver ore had been produced. In 1874 the mine was being worked inconjuction with Silver Vally mine (which was at work in 1852 as well).
Recorded production:
Wheal Duchy
200 tons of silver ore

Mineral List

14 entries listed. 12 valid minerals.

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Henwood, W.J. (1843): On the Metalliferous Deposits of Cornwall and Devon. Transactions of the Royal Geological Society of Cornwall 5, 1-386.

Dewey, H. (1921): Special Reports on the Mineral Resources of Great Britain, Vol. 21: Lead, Silver-Lead and Zinc Ores of Cornwall, Devon and Somerset. HMSO Publications (London), pp. 48-49.

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