winzes

These successive levels were not only connected and communicated with by the main shafts of the mine, but by "winzes" or smaller shafts which connected level with level in many places.

Deep Down, a Tale of the Cornish Mines 1859

To remedy this evil, holes, or short shafts, called "winzes," are sunk at intervals from the upper to the lower levels.

Deep Down, a Tale of the Cornish Mines 1859

The settling ore and the crushing after the stope is empty make it difficult to maintain timbered winzes.

Principles of Mining Valuation, Organization and Administration Herbert Hoover 1919

In flat-backed stopes (Fig. 33) winzes must be put in every 50 feet or so, while in rill-stopes they can be double this distance apart.

Principles of Mining Valuation, Organization and Administration Herbert Hoover 1919

Where it is desired to maintain the winzes after stoping, they must either be strongly timbered and lagged on the stope side, be driven in the walls, or be protected by a pillar of ore (Fig. 37).

Principles of Mining Valuation, Organization and Administration Herbert Hoover 1919

Thus not only is there less shoveling required, but fewer ore-passes and a less number of preliminary winzes are necessary, and a wider level interval is possible.

Principles of Mining Valuation, Organization and Administration Herbert Hoover 1919

A block to be attacked by this method requires preliminary winzes only at the extremities of the stope, -- for entry and for ventilation.

Principles of Mining Valuation, Organization and Administration Herbert Hoover 1919

For flat veins with strong walls, it has a great superiority in that the stope is carried back more or less parallel with the winzes, and thus broken ore after blasting lies in a line on the gradient of the stope.

Principles of Mining Valuation, Organization and Administration Herbert Hoover 1919

Further saving in shoveling can be gained in this method, by giving a steeper pitch to the filling winzes and to the ore-passes, by starting them from crosscuts in the wall, and by carrying them at greater angles than the pitch of the ore (Fig. 36).

Principles of Mining Valuation, Organization and Administration Herbert Hoover 1919

A mine once started on the system is most difficult to alter, owing to the lack of frequent winzes or passes.

Principles of Mining Valuation, Organization and Administration Herbert Hoover 1919