Crecimiento demográfico de Nerva en el boom minero Historical milestone · Nerva, Cuenca Minera, Huelva Image of Nerva, not of the place itself. Driven by the working of the Peña del Hierro mine by the Rio Tinto Company Limited from 1873, Nerva's population rose from about 6,431 inhabitants in 1877 to 16,807 in 1910, one of the fastest growth rates in the province of Huelva. Photo: 19Tarrestnom65 (CC BY-SA 4.0) What to see and do in Nerva