The work proceeded on a larger scale with exploration of outcropping veins and a very rudimentary manual plant employing almost 100 people. At a later date the concession was sold to the banker Henrique Burnay, 1st Earl of Burnay. Exploration increased in size with the preparation of veins and expansion of surface installations. In 1901 the concession was leased to a British company for a short period. Subsequently, the first mechanical steam plant was assembled. The first galleries (drives) (nº 10 and nº 13) date from this time. There are no production records but a shipping record dated 25 November 1909 indicated 41 tons of wolfram concentrates; a notable amount for an exploration of the time. From then on, one can identify some well-defined periods in the history of the Panasqueira mine.