Tharsis, la colonia minera de Alosno Curiosity · Alosno, El Andévalo, Huelva Image of Alosno, not of the place itself. A population centre within the municipality of Alosno, not an independent municipality, which grew up in the 19th century around one of the largest pyrite mines in Europe, worked with British capital; it had 1,750 inhabitants in 2020. Photo: Jose A. (CC BY 2.0) What to see and do in Alosno