Vertical shaft hoisting method for very shallow mines (<500m) and for mines with the max depth realised in shaft with a single shaft depth >2000m.
Blair Multi rope winder is used with one rope doubled down to two drums on each conveyance.
The rope is spooled in more than one layer. 8 Strand Langs Lay and triangular strand ropes.
On a drum application in a shallow depth or with a large drum diameter.