Ключевые слова: acidic, acidophile, andalusia, color, construction, cooper, copper, ecology, engineering, environment, excavation, excavator, geology, gold, historical, huelva, industrial, industry, infrastructures, iron, locomotive, machinery, metal, mine, miner, mineral, minerals, mines, mining, natural, nature, old, oxide, pyrite, railroad, railway, red, riotinto, river, rock, spain, stone, stromatolites, sulfur, sulfuric, textures, tinto, transportation, wagon, water,