TIN. 
533 
venturers, and called the captain , keeps the ac- 
counts, pays and regulates the mines, and manages 
a variety of concerns. Besides this man there are 
under-ground captains , as they are called, who have 
the immediate inspection of the works below, or in 
the mine survey the ladders and ropes, and gene- 
rally overlook all the different objects connected 
with the working of the mine. 
Among the tin-mines in other parts of Europe 
may be noticed that of Marienburg in Upper 
Saxony. This mine, according to Jars, is situated 
in a mountain called Wildberg, and the princi- 
pal vein is about a fathom in thickness. Towards 
the middle of the vein there is a streak, seven or 
eight inches thick, of yellow copper ore containing 
silver, and mixed with the tin. The matrix of the 
vein is a gray slate, studded with black and white 
mica. The mine has been worked to the horizontal 
extent of forty fathoms, and to the depth of twenty- 
seven. 
At Gayer in Saxony, there is a large mass of 
mineral situated on the top of a mountain, and con- 
taining a quantity of tin. This mine has continued 
to produce metal since the twelfth century, and en- 
closes a number of little veins of mineral, the most 
part of which contain tin. When Jars visited these 
mines, the workmen had penetrated to the depth 
of sixty fathoms, where they found some excellent 
mineral. He describes the veins as lying between 
beds of stone and slate, and says that they produce 
good tin principally where they cross the great 
