Mine Terms D

Cornish Mine Terms

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Term	Definition	Examples
Deads	Deads is a name given to waste rock containing little or no ore, also called Attle.
Dip	The Angle that a lode makes from the Horizontal. Lodes in Cornwall normally dip steeply from the vertical to about 60 degrees. The Great Flat lode of Redruth being an exception at 40-45 degrees dip. Underlie is the angle of a lode measured from the vertical.
Double acting engine	A steam engine in which both strokes of the piston were powered, steam pushed the piston both up and down.Whim engines were normall double acting but pumping engines single acting.
Drage	Drage is the classification of ore that is mixed with gangue and requires sorting and processing. It is richer than Halvans and in a copper mine the majority of ore being processed would be drage
Dressing	The series processes used to separate an ore from waste material to make it ready for sale.It may involve breaking up of rocks, stramping, crushing,sorting concentrating and roasting.	Copper dressing diagram and terms
Dressing floors	The area of a mine where the ore was dressed.
Drum shaft	An engine term. A drum shaft is the shaft carrying winding drums of a horizontal whim engine.
Drys	The miners changing room. Drys were heated by steam pipes,often taken off from the engine boilers The 1872 metalliferous Mines Regulations act required a heated dry to be provided at mines with more than thirteen underground employees.