Lost mines
Phrases that hint at mines abandoned or rumored — the "the old workings," "the lost ledge," "rich float" newspaper-language for prospects that never got relocated.
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Image 45 of El Paso herald (El Paso, Tex.), October 14, 1911, (Statehood Jubilee Edition=Section 6) (1911) "lost mine"
…h strikes of Indian workings of mysterious Aztec cares lined with pure metal of lost mines all this etory with Its wealth of romantic charm is as a childs story book when compared with the tremendous romance of the future development of the Grant