I believe silver is not a good material to be used in heatsinks. It's likely that base is aluminum. A Dremel with a cutoff wheel or angle grinder may be your best tool to separate the aluminum from the copper. If you're not selling the heatsink to boardsort, check with your local scrap yards to see how much they will pay for it. If you separate the aluminum and copper, expect #2 copper price. If leaving it as is, you will get aluminum/copper radiator pricing in most places. In some states, you may need to be a licensed A/C technician or have a permit from a licensed A/C tech to be able to get Al/Cu radiator pricing.
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