Coal mining generates significant adverse environmental impacts. Historically, coal mining has been a very dangerous activity and the list of historical coal mining disasters is a long one. Underground mining hazards include suffocation, gas poisoning, roof collapse and gas explosions.
The term 'OVD' (Optically Variable Device) is used to describe both laser generated hologram images and electron beam generated images. These optically variable devices are created in highly-secure facilities and are at the forefront of overt asset and brand protection programmes.
1 Voles are small, destructive animals that like to create tunnels around your yard. 2  Theâ¦. 3  The Self Help Guide to Vole Extermination Voles, or field mice, are considered a pest by farmers and orchard owners for their habit of causing severe damage to crops and trees. 4  For homeowners with small gardens, theyâ¦.