Some facts you might find of interest.
As mentioned previously, a magnet can be used to find most Canadian coins, (since about 1967).
If you have a magnet from a hard drive, or stereo speaker, your better off keeping the metal that is connected to it as this increases the attraction by about 100% over having just the bare magnet.
All that stuff you find stuck to your magnet isn't gold, (as much as you might wish it was), but some of it could be, so if your in an area that is known for having gold, you might want to hang onto the black sand.
Here in British Columbia, Canada, theres no shortage of black sand and saving it is worth your while, considering half of the gold in the province is considered ferrous, (ie: can be attracted by a magnet). Your location may have similar gold and iron content. Personally, I wouldn't go out with one of my ancient metal detectors, or with my gold pan without having my magnets along for the ride.
When storing, or using magnets, keep the like poles away from each other even though you might not want them attracting each other, (I recommend a wooden with steel plate attached to either side to act as a spacer between them, with the opposite poles closest to each other). As you know, like poles repel, but they also tend to cause a loss of magnetic attraction depending on the material they are made of and the distance and duration of exposure to the other like pole.
F.