any of two or more products resulting from the same unit process or product system
see also: by-products, industrial symbiosis
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note: A co-product's output is intentional and of significant economic value. For example, gold in a copper-gold mine is a co-product. Copper can be a co-product as well, e.g. for about 200 secondary mines that target other commodities. Also in e-waste recycling, copper is a co-product.
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standard: ISO 14040
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