The document discusses a new type of explosive called Supermite 5 that has properties making it suitable for underground coal mining. Supermite 5 comes in plastic film cartridges that are 32mm in diameter and 180mm long, containing 200g of an emulsion explosive. It has a high vapor gap sensitivity and produces low fumes, making it appropriate for use in underground coal mines. Safety guidelines specify a maximum charge of 1000g per hole in Degree I mines and 565g in Degree II and III mines, and it should be initiated with a No. 6 strength detonator.

1. ASSIGNMENT
-Group 3

2.  Blasting practices in underground mines has
limited flexibility due to many safety criteria,
statutory and field constraints.
 This has narrowed the scope of major
modifications in the solid blasting design vis-
à-vis the efficiency and yield per round.
 So, for achieving
New Kind of
Explosive
New method of
blasting techniques
Balancing
Underground
and Opencast
production

3.  Description
 Supermite is a detonator sensitive emulsion
explosive, comes as a plastic film cartridge.
 This packaged emulsion explosive is a robust,
high strength widely used in underground
coal mines.

4.  Diameter – 32 mm
 Length – 180 mm
 Weight of cartridge – 200 g
 Supermite 5 is a P5 type permitted explosive
for use in Degree I, II and III gassy coal mines.

5. Nominal Density (g/cc) 1.10±0.05
Typical VOD (m/s) 3450 m/s
Relative Weight Strength % 72
Relative Bulk Strength % 95
Water Resistance Good
Energy (KJ/Kg) 5500
Compared to ANFO@ 0.85 g/cc

7.  Has high Air gap sensitivity of 150 mm compared
to any other emulsion cartridge explosive.
 The post detonation fume characteristics and non
incendivity of Supermite 5 make it suitable for
blasting in underground coal applications.
 Avoid extremes of shock, heat, friction or
mechanical impact to prevent pre-mature
initiation.
 The shelf life of Supermite 5 is 1 year from the
date of manufacturing.
 The undamaged product may be charged and
fired several days later in dry holes. (higher
sleep time).

8. CHARGING
 The maximum charge per shot hole for P5 type
permitted explosives must not exceed 1000 grams in
Degree I mines and 565 grams in Degree II & III mines.
PRIMING & INITIATION
 The recommended initiator for Supermite 5 is a No.6
strength, DGMS approved, non-incendive short delay
detonator.