In 1806, two Idria furnaces were put up at almaden, but the engineers are not favorably impressed with them.
At Idria and almaden the sulphurets are extremely rich in mercury.
Of this metal the mines in almaden produce about one-half the world's supply.
The Cordova lead mines are the richest in the world, and the mercury mines of almaden are second only to those of California.
In addition, small quantities of quicksilver and vermilion were made at almaden.
Moreover the revenues of Cuba, like the mines of almaden, are a ready resource as security for a loan.
Pass we on to the almaden mines, of which there is a detailed and very interesting account.
There is also a particular description of the quicksilver mine at almaden, in La Mancha.
There is here evidently confusion between Almagro and almaden.
The oldest and richest mine of Mercury is that of almaden in Spain.