Twin Metals

Producing a longitudinal longhole retreat underground blast design.

April 2015
Twin Metals Minnesota

Twin Metals Minnesota retained RESPEC to produce production and development blast designs for the prefeasibility study of a longitudinal longhole retreat mining operation.  RESPEC produced two conceptual blast designs for Twin Metals: a drop raise design and a longhole stope blast design.  The technical document also included drill-and-blast parameters that allowed Twin Metals to conduct a financial evaluation.