Stemrock-Evara
Engineered stemming spheres and precision mechanical plugs for controlled, high-performance blasting operations across Indonesian open-pit mines and quarry excavations.
Engineered borehole stemming technology that locks explosive detonation energy into the rock mass, maximizing rock fracture energy transmission and eliminating bulk emulsion gassing wait-time (delay) in mine pits.
5 Technical Advantages of Stemrock-Evara
Blasting performance is not only about the explosive. Stemming, energy distribution, initiation control and operational safety all influence the final result.
Creates a locking effect that reduces stemming ejection and flyrock
Creates a mechanical wedging-cone locking effect in the borehole that retains stemming particles in the rock column, minimizing perimeter critical flyrock risk.
Improves interlocking for better blasting and fragmentation performance
Enhances aggregate cap and RockLok ball interlocking, ensuring detonation gas energy acts longer on the rock mass to yield uniform rock fragmentation.
Applicable for air-column (decking) blast holes and vibration control
Highly compatible with air-decking techniques and multi-bench charge splitting, cutting explosive consumption (powder factor) while lowering ground vibration levels (PPV).
Distributes explosive energy more evenly, reducing stemming height
Evenly distributes detonation shockwave pressure across the borehole wall, allowing reduced stemming collar height without flyrock breakout.
Eliminates 100% of emulsion gassing wait time — stemming proceeds immediately after charging
Eliminates operational wait times for bulk emulsion gassing/maturation. Operators can proceed with Stemrock-Evara insertion and aggregate stemming immediately after charging.
Evara Structural Components
from high-density engineered polymers to withstand instant detonation shockwave impact.
Evara Funnel
High-precision guide cone designed to support fractured rock aggregate loading while maintaining borehole gravity flow.
Evara Diffuser
Perforated directional ring structure distributing explosive detonation gas pressure radially against the borehole rock wall.
Evara Base
Mechanical locking base mounted directly on borehole collar or floating atop emulsion/air deck without damaging detonator/lead wires.
RockLok Spheres
High-density engineered composite spheres with calibrated specific gravities forming a rigid interlocking matrix under blast pressures.
Ready to Elevate Blast Productivity in Your Pit?
PT Evara Trinitas Abadi technical services team is ready to conduct field site surveys, borehole charge modeling calculations, and on-site Stemrock-Evara demonstrations at your concession.