The story
The Congress Mine struck gold in 1884 in the Date Creek country of Yavapai County, Arizona, and for three decades it ranked among the territory's great producers — a camp of some thousands in its 1890s peak, with mill, railroad spur and the layered dugout-and-frame housing of desert mining life; presidents' trains paused below, the ores thinned, and by the 1930s the camp had emptied into the foundations, mill terraces and cemetery that remain in the hills above modern Congress, the highway hamlet that inherited the name. Its telling is Arizona mining-canon: lamps moving on the dark workings, the ring of single-jacks from sealed adits, figures at the cemetery and mill walls, and the Cornish-inflected knocker lore the territory's camps shared — undocumented, traditional, told at a distance because the ground itself forbids approach: open shafts and private/active claims lace the area, and the record states the rules plainly — legal access only, never near workings. Present Congress as gold-boom archaeology first, its moving lamps the desert's oldest miner story.