Final answer:
Magnetic separation, using a magnet such as a bar magnet or magnetic conveyor belt, leverages the magnetic property of magnetite to separate it from non-magnetic gravel.
Step-by-step explanation:
To separate magnetite from gravel, a magnetic separation method can be used. This involves using a magnet to attract the magnetite, which is a naturally magnetic mineral, thus allowing it to be separated from non-magnetic substances like gravel. For example, a simple way to achieve this is by passing a magnet over the mixture. Due to the magnetic property of magnetite, the iron filings will adhere to the magnet, leaving the non-magnetic gravel behind. This process can be scaled up by using conveyor belts with magnets underneath or other mechanical separators specially designed for larger scale operations.
The magnetic property utilized in this method is the inherent magnetism of magnetite which causes it to be attracted to the magnetic field created by the magnet, thus facilitating its separation from the gravel.