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<p>[QUOTE=&quot;desertgem, post: 2292297, member: 15199&quot;]The most likely answer is heat damage as mentioned. The outer nickel containing clad has a lower thermal expansion than the copper core, thus producing separation in areas the clad is weaker. </p><p><br /></p><p>A silver clad copper coin would not be an acceptable solution for any mint produced coin, as there would be little protection from wear of the silver which is by far the more expensive, being on the outside and cheap copper on the inside.[/QUOTE]</p><p><br /></p>

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