You Build a Rocker Box, Make a Manual Rock Crusher, Shaker Table for Gold, Fabricate a Dry Washer, How About Self Built Metal Detector?

This is got to be one of the most popular gold prospecting sites on the Web. This link connects you to ideas and plans for making your own equipment. These folks sell components too. If you are an old pro, you have probably looked at this before. But I figure with price of gold slowly rising again, there may be a lot of people looking for a way to make their own equipment. Equipment tends to be expensive, and I have found so much so that the only way I can prospect is if I do it myself. This is the first place you probably should look. Good luck.
http://nevada-outback-gems.com/design_plans/DIY_equipment.htm

from the Mary Rose trust

Wikipedia