Sub-level stoping

When mining adjecent to the ore boundary, the straightness of Wassara-hammers guarantees both improved ore recovery and minimal dilution.

Improved blast results

In sub-level stoping, the holes are generally just a few metres apart and some of the holes are adjacent to both the foot wall and the hanging wall.

If deviation occurs, it causes a decrease in ore recovery, an increased amount of dilution, and less homogenous fragmentation. In the worst case this could result in a freezed blast.

In other words, the accuracy of the blast holes is the most important aspect in a successful blast. Wassara-hammers drills straighter blast holes than any other production drilling method. It is therefore the best method to turn a carefully planned drill and blast design into reality.

No need for undercuts

When conventional drilling methods are used for sub-level stoping, with long distances between the levels, it is common to drill an undercut to avoid the risk of high blast hole deviation. However, an undercut is both costly and time consuming since it literally turns one stope into two.

With Wassara-hammers, there is no need for undercuts since this technology guarantees the necessary accuracy for all sub-level stoping distances.

In other words, Wassara-hammers improves the productivity as well as the profitability from increased ore recovery a decreased dilution.

Examples of successful projects

  • Jet-grouting columns in difficult geology in Hässleholm, Sweden

    A storage building has been constructed in Hässleholm, Sweden. The ground needed stabilization as the geology presented sand and friction …

  • Energy storage in Lund, Sweden

    A project with strict restrictions regarding the water returned to the sewage system.

  • New ground engineering hammer, tested in Södertälje Canal, Sweden

    Wassara´s new hammer developed specifically for Ground Engineering was tested in a casing advancement application during dredging works for widening …