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The Activity: Procedure
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- Prepare the leach pad by punching
holes in the Styrofoam bowl. Punch holes up the side
on one side so the solution can drip out of the side
of the tilted apparatus. The bowl with holes in
represents the pipes with holes in that lead the
solution with the dissolved metal to the collection
troughs. (Alternatively, use a round tooth pick to
punch 4 holes at the bottom of half a small Styrofoam
"clam shell" sandwich container. Put
1.5" pieces of coffee stirrer straws into the
holes to simulate the pipes that carry the gold
bearing solution.)
- Place filter paper in bowl to keep ore
rock in the bowl. The filter paper represents the
rock that covers the perforated collection pipes.
- Build the leach heap by putting the
mixture of crushed rock and cupric sulfate into the
bowl lined with the coffee filter.
- Place the bowl with the crushed rock
on a Styrofoam plate. This plate represents the
plastic liner at the bottom of the leach heap. The
impermeable clay layer is represented by the
worktable.
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The Activity: Procedure
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