Is the origin of earths heavy metals known?

I'm not an astronomer, but do use my layman's fascination for this sometimes in my chemistry classes.

Given that earth's non Hydrogen materials originated in a supernova in the distant past, I wonder if there are likely candidates located nearby. Or was the supernova event so long ago that there just is no way to know?

via International Skeptics Forum http://ift.tt/1sMTYFR