The Golden Waterfall's color comes from the geology beneath it. The mountains above Ruifang District are rich in sulfur, arsenic, and copper ore - a mineral cocktail that formed over millions of years of volcanic and hydrothermal activity. Rainwater seeps through cracks in the surface rock, percolates down into abandoned mine tunnels and natural fissures, and interacts with these mineral deposits along the way. The result is water saturated with dissolved metals, particularly iron in its ferric form. When this mineral-laden water emerges at the surface where the terrain drops sharply, it cascades down the hillside as a golden stream. Over time, the arsenic and other minerals in the water have stained the rocks themselves a deep ochre yellow, making the entire waterfall site look as though it has been dipped in gilt. The beauty comes with a warning: the water is genuinely toxic. The concentration of heavy metals makes it dangerous to touch, and visitors are advised to admire the falls from a distance rather than wade into the stream.

Near the waterfall stand the remains of an old gold mining factory dating to the Japanese occupation of Taiwan, which lasted from 1895 to 1945. The Japanese industrialized gold extraction across this mountainous region, building smelters and processing facilities that transformed quiet hillside villages into bustling mining towns. Jinguashi and the neighboring town of Jiufen became synonymous with gold, attracting thousands of workers and their families. When the mines eventually closed, the infrastructure remained - concrete foundations, rusting machinery, empty tunnels boring deep into the mountains. It was the presence of this abandoned factory, so visibly connected to the waterfall's source, that led generations of locals to assume the golden color was an industrial byproduct. The assumption was understandable but backwards. The mines were built here because the minerals were already present. The waterfall's color predates the mining by geological ages. The Japanese found gold because the mountain had been advertising it, in liquid form, for millennia.

The Golden Waterfall does not simply disappear after its descent. Its mineral-rich water flows downhill into Shuinandong Bay, where it meets the Pacific Ocean in a phenomenon the locals call the Yin-Yang Sea. Viewed from the coastal road above, the bay presents a striking visual: half the water is the normal deep blue of the open Pacific, and half is a milky ochre yellow, stained by the ferric iron particles carried down from the mountains. The two colors meet in a wavering, shifting line that never quite resolves. The name draws on the Taoist concept of complementary duality - two opposite forces forming a single whole. The yellow is not pollution overcoming the blue. The blue is not cleanliness resisting the yellow. They coexist, each defined by the other, in a bay that has looked this way for far longer than anyone has been watching. On clear days, when the sun catches the contrast between the warm gold of the runoff and the cold blue of the Pacific current, the effect is less like looking at water and more like looking at a painting that someone left unfinished on purpose.

The Golden Waterfall sits in a landscape saturated with the legacy of extraction. Jiufen, the famous hillside tourist village, lies a few kilometers to the south. Jinguashi, with its ruined thirteen-story smelter and Gold Museum, is even closer. The entire Ruifang District mountainside is threaded with abandoned mine shafts, some reaching hundreds of meters below sea level, all of them slowly filling with the same mineral-rich groundwater that feeds the waterfall. From the road that winds along the coast between Jiufen and the waterfall, the terrain tells a single continuous story: people came for the gold, built an industry on the mountain's mineral wealth, extracted what they could, and left. The mountain continued doing what it had always done - pushing mineral-laden water through its cracks and fissures, painting its own rocks, feeding its golden stream to the sea. The waterfall is not a remnant of mining. It is what was here before the mining started, and what will be here long after the last factory wall crumbles into the hillside.