The library is a gold mine of information.
the estate sale promises to be a gold mine for antique dealers
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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 Websites like Etsy, 1stDibs, and Chairish are a gold mine for great deals on new and old pieces.—Lauren Bengtson, Better Homes & Gardens, 5 Mar. 2026 For a writer, examining this architecture is a gold mine.—Literary Hub, 24 Feb. 2026 See All Example Sentences for gold mine