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Here's a overview and demo of my homemade rock crusher. This will take about a 6" rock and crush it to gravel or finer. You can build one of these for under $100. All that's required is steel from the scrap yard, a welder, and angle grinder with cutting wheel.
This gets my gold quartz ore small enough to run in a hammer mill. The whole machine weighs ~200lbs and the hammer comes out, so that I can move the machine more easily in and out of my truck.