The discovery of the Varilongo deposit Historical milestone · Santa Comba, Xallas, A Coruña Image of Santa Comba, not of the place itself. Mount Varilongo began to be worked in 1914 for its iron and its quartz. Decades later the confirmation of wolfram in the seam would make Santa Comba the largest European operation for the mineral and would transform its economy. 1914 Photo: Miguel Branco (CC BY-SA 4.0) What to see and do in Santa Comba