The library is a gold mine of information.
the estate sale promises to be a gold mine for antique dealers
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Are the Dodgers baseball’s version of a gold mine?—Bill Shaikin, Los Angeles Times, 26 Mar. 2026 Come prepared to strike many a pose, because Hannah’s closet is an Instagram feed gold mine.—Gina Vaynshteyn, StyleCaster, 25 Mar. 2026 Sure, there’s always some folks out there who leave reviews without actually making the recipe, but true reviews are a gold mine.—Josh Miller, Southern Living, 14 Mar. 2026 The real gold mine would be if the government were to release the first-ever photo or video of a UAP obtained via satellite, said Harvard professor and astrophysicist Avi Loeb.—Danya Gainor, CNN Money, 7 Mar. 2026 See All Example Sentences for gold mine