If a stock is not registered with the SEC and is Suspended the stock can remain on the Grey Market for years because there is/are no stock registration(s) to revoke. Market Makers are forbidden from making any market or quotations on all SEC Suspended stocks.
Banyan Gold, BYAGF, was never suspended by the SEC so it is on the Grey Market as a foreign Issuer and is merely waiting for FINRA to approve a Market Maker to represent the stock with quotations.