Forget everything you know about driveways. Asphalt, concrete, crusher run gravel, rail road ballast, paving stones... If you have a long driveway, or if you need a system of driveways on a farm, and you are planning to go with those common methods of paving a driveway, you are going to need a separate mortgage just for the driveway (or driveways).
A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing processes, paints, pyrotechnics, ceramics and selective laser sintering.It works on the principle of impact and attrition: size reduction is done by impact as the balls drop from near the top of the shell.
An amalgam is an alloy of mercury with another metal, which may be a liquid, a soft paste or a solid, depending upon the proportion of mercury.These alloys are formed through metallic bonding, with the electrostatic attractive force of the conduction electrons working to bind all the positively charged metal ions together into a crystal lattice structure.