Based on Northwestern's website (http://www.northwesternextract.com/brewing/malt/), their Gold LME is equivalent to light LME (not extra light) from other companies. It falls right in between their Extra Light and Amber LMEs.
Based on this Home Brew Talk thread (http://www.homebrewtalk.com/f12/what-gold-lme-126714/), the last post explains that Briess also has a Gold LME and what's used to make it. I would guess that's very similar to Northwestern's.
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