Definition of jumbo

i. In mining, a drill carriage or mobile scaffold on which several drills of drifter type are mounted. It is used in tunnels and large headings.



Ref: Pryor, 3

ii. An asbestos-fiberizing machine that is effective for moderately soft ore where crushing or breaking is not required.

Ref: Sinclair, 7

iii. A mobile scaffold to assist drilling in large headings.

Ref: BS, 12

iv. A number of drills mounted on a mobile carriage and used in tunnels.

Ref: Nichols, 1

v. Drilling platform used in tunneling.

Ref: Sandstrom