TO THE MINES OF CREMNITZ. 353 
Tellurium mine at Nagyag, we noticed some in- chap. 
stances where the ores of gold did not contain ■ 
silver; otherwise it might be stated as a general 
observation applying to all the mines, whether of 
i\iQ north of Hungary, or of the Bonnat, or of Tran- 
^Ivania, that every ore containing gold, con- 
tains also a certain portion of silver. This was 
afterwards stated to us by Professor Passern at 
Schemnitz, and by others acquainted with Hunga- 
rian mines, as an observation admitting of no 
exception. And vice versa, every mineral, con- 
sidered as an ore of silver, however pure the 
silver may appear, is also said to contain gold; 
even the richest sulphurets of that metal, called 
vitreous and ductile silver ore^. 
The next morning {May 14) we were occupied 
in collecting minerals from the mine\ The ore 
dug here consists of clay and ochreous quartz. 
(2) This does not, however, agree with Klaprotlis analysis of the 
sulphuret of silver, wlio makes it to consist of eighty-seven parts of 
sTLYEU, and fifteen of sulphur. — See Analytical Essays, vol. 1. p. \W. 
Jjynd. 1801. 
(3) Besides the rich ore of the mine, which consists of quartz pene- 
trated by auriferous clay, and by the oxide of iron, we obtained here the 
following minerals: 
1. Native goW, in quarts. 
2. Black silver, with auriferous pyrites. 
?,. Sulphuret of silver, containing ^ohl. 
4. Black silver, with primary crystals of the sulphat ofbarytes, <j|c.cj-c. 
VOL. VIII. 9. A 
