I'm not familiar with a location called 渭南伦敦金 (Wei'nan London Gold)、It's possible that it's a lesserknown or local term、Could you provide more context or information about what this refers to?

If you're looking for information on gold in London or gold trading, I'd be happy to help with that! London is a major hub for gold trading, and there are several institutions and markets that deal with gold and other precious metals.

If you could provide more context or clarify what you're looking for, I'd do my best to assist you.