"virgin metal" gets quite a lot of hits, includfing:
PDF] Appendix I: Recycling Markets
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... decades. Although recycled metal is most commonly mixed with virgin metal to make
"new" products, there is very little difference in strength perfor- mance. ...
www.umich.edu/~nppcpub/resources/compendia/ARCHpdfs/ARCHr&r... - Similar pages
But "new metal" gets even more hits, though many of them are for music bands.
Both terms are OK, depending on the langauge used in your context.