1) Refuse matter separated from the metal in the smelting process.

1721 all the waste of Lead ore or slagge, Buckden. The slag from former bole hills was evidently worth re-smelting and is referred to as slagwork or blackwork: 1427 antiquum slagwerk remanentem ex antiquo, Stanhope Park, co. Durham. A ‘slag hearth’ used for that purpose is mentioned in Derbyshire in 1572.

dates 1427 1572 1721

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