The Tharsis Sulphur and Copper Company was a major employer both at its copperworks in Garngad in the Dennistoun district of Glasgow and also at its copper mines at Tharsis in Andalucia, Spain.

"The Mines of Tharsis" by S G Checkland was published in 1967 because the Company's records were donated to the archives of Glasgow University. The book gives an excellent account of this significant economic activity during the industrial revolution.

Many British went to work in Spain and a list of foreign residents of the Mines of Tharsis in the year 1887 is found on this page:

http://amigosdetharsis.blogspot.com/2009/05/british-en-thars...